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| 1 | Two-stage Hall-Petch relationship in Cu with recrystallized structure显示文摘Although Cu was studied extensively,the Hall-Petch relationship was mainly reported in the coarsegrained regime.In this work,fully recrystallized Cu specimens with a wide grain size regime of 0.51–14.93μm manifest a two-stage Hall-Petch relationship.There is a critical grain size of 3μm that divides stagesⅠandⅡwhere the Hall-Petch slope k value are quite different.The stageⅡis supposed to be validified down to 100 nm at least by comparing with a Cu-Ag alloy.The critical grain size varies in different materials systems,and the underline mechanisms are discussed based on the dislocation glide modes. | Y.Z.Tian Y.P.Ren S.Gao R.X.Zheng J.H.Wang H.C.Pan Z.F.Zhang N.Tsuji G.W.Qin | 2020 | Journal of Materials Science & Technology2020，47，13： | 8 |
| 2 | Fatigue behavior of CoCrFeMnNi high-entropy alloy under fully reversed cyclic deformation显示文摘Bulk ultrafine-grained(UFG) CoCrFeMnNi high-entropy alloy(HEA) with fully recrystallized microstructure was processed by cold rolling and annealing treatment. The high-cycle fatigue behaviors of the UFG HEA and a coarse-grained(CG) counterpart were investigated under fully reversed cyclic deformation.The fatigue strength of the UFG HEA can be significantly enhanced by refining the grain size. However,no grain coarsening was observed in the UFG HEA during fatigue tests. Mechanisms for the superior mechanical properties of the UFG HEA were explored. | Y.Z.Tian S.J.Sun H.R.Lin Z.F.Zhang | 2019 | Journal of Materials Science & Technology2019，35，3： | 8 |
| 3 | Three principles for preparing Al wire with high strength and high electrical conductivity显示文摘The trade-off relation between the strength and the electrical conductivity has been a Iong-standing dilemma in metallic materials. In the study, three key principles, i.e.elongated grains, sharp texture and nano-scale precipitates, were presented for preparing Al wire with high strength and high electrical conductivity based on the specially designed experiments for breaking the mutually exclusive relation between the strength and the electrical conductivity. The results show that the elongated grains could lead to a higher electrical conductivity in Al wire without sacrificing the strength;while, the <111> sharp texture can efficiently strengthen the Al wire without influencing the electrical conductivity. Furthermore, nano-scale precipitates with proper size can simultaneously improve the strength and electrical conductivity of Al alloy wire. Under the guidance of the above three key principles, Al wires with high strength and high conductivity were prepared. | J.P.Hou R.Li Q.Wang H.Y.Yu Z.J.Zhang Q.Y.Chen H.Ma X.M.Wu X.W.Li Z.F.Zhang | 2019 | Journal of Materials Science & Technology2019，35，5： | 7 |
| 4 | A practical model for efficient anti-fatigue design and selection of metallic materials:Ⅰ.Model building and fatigue strength prediction显示文摘The high cost and low efficiency of fatigue tests are bottleneck problem for the anti-fatigue design of metallic materials.For this problem,a theoretical fatigue model is proposed in this study,the possible applications have also been discussed.Specific results would be introduced in two serial papers,in which the first paper focuses on the model building and the applications on fatigue strength prediction;the second paper put emphasis on the influencing factors of the model parameters and the applications on fatigue strength improvement.In this first paper,a theoretical model is proposed considering both the strength and plastic restrictions of fatigue strength.As the model builds up a brief relationship among yield strength(Y),tensile strength(T)and fatigue strength(F),it is named as the Y-T-F model.Through the verification with fatigue strength data covering various kinds of metallic materials and loading conditions,this Y-T-F model exhibits both generality and accuracy.With the Y-T-F model,the efficient fatigue strength prediction could be conducted by brief linear fitting and calculation,just through yield strength,tensile strength and several known fatigue strength data.Moreover,through its deduced Y-F model,the analytical formula of fatigue strength continuously changing with materials strengthening can be obtained,as well as the maximum value of fatigue strength and corresponding critical yield strength.In summary,the Y-T-F model would be useful for reducing the fatigue tests,thus providing new possibilities on the efficient anti-fatigue design and selection of metallic materials. | R.Liu P.Zhang Z.J.Zhang B.Wang Z.F.Zhang | 2021 | Journal of Materials Science & Technology2021，，11： | 4 |
| 5 | A practical model for efficient anti-fatigue design and selection of metallic materials:Ⅱ.Parameter analysis and fatigue strength improvement显示文摘In the first paper,a Y-T-F model was proposed based on the restrictions of both strength and plasticity;the corresponding applications on the fatigue strength prediction have also been discussed.In this second paper,the emphasis will be put on the issues of fatigue strength improvement.Based on the primary form of the Y-T-F model,the parameters are further analyzed and quantified,to clarify the influences of various factors on fatigue strength.Firstly,the damage capacity C is proved to be sensitive to the elastic modulus E,which could change with the alloying components and nano-scaled grain boundaries;the increase of E would lead to the increasing C,thus increase the fatigue strength.Secondly,the microstructure characteristic coefficient a,as well as the yield strengthσ_(y) and tensile strengthσ_(b) in the crack initiation region could be influenced by the processing mode,grain size and microstructure uniformity of materials;the change of microstructure characteristics would affect the changing tendency of tensile strength--fatigue strength relation via varying the values of a,σ_(y) andσ_(b).Thirdly,the damage weight coefficientωis found to be a reflection of the fatigue strength declination induced by defects;the defect dimension D,the defect shape correlated stress concentration coefficient Kt,as well as the strengthening level of matrix materialsσ_(b) are all corresponding factors.Quantified correlations between the above parameters and corresponding factors are comprehensively built up,hence obtaining the influences of either a single factor or multiple factors on fatigue strength.This further developed Y-T-F model would be helpful to clarify the direction of fatigue strength improvement,and contribute to the anti-fatigue design optimization of metallic materials. | R.Liu P.Zhang Z.J.Zhang B.Wang Z.F.Zhang | 2021 | Journal of Materials Science & Technology2021，，11： | 3 |
| 6 | Deformation behaviors of Cu bicrystals with an inclined twin boundary at multiple scales显示文摘Cu bicrystals of different sizes with a sole twin boundary(TB) inclined at 45?with respect to the loading direction were deformed under unidirectional and cyclic loading, respectively. It is found that the slip bands(SBs) parallel to the TB can be activated near the TB at all scales without obeying the Schmid's law.It is concerned with the local stress enhancement in the macroscale while it is more closely related to the scarce dislocation sources in the microscale. Moreover, a wedge-shaped zone formed near the TB in the microscale ascribed to the limited specimen size. | L.L.Li Z.J.Zhang P.Zhang J.Tan J.B.Yang Z.F.Zhang | 2017 | Journal of Materials Science & Technology2017，33，7： | 3 |
| 7 | Predicting the variation of stacking fault energy for binary Cu alloys by first-principles calculations显示文摘The variation of stacking fault energy(SFE)in a number of binary Cu alloys is predicted through considering the Suzuki segregation by the full potential linearly augmented plane wave(FPLAPW)method.The calculated results show that some solute atoms(Mg,Al,Si,Zn,Ga,Ge,Cd,Sn,and Pb),which prefer to form the Suzuki segregation,may decrease the value of SFE;while the others(Ti,Mn,Fe,Ni,Zr,Ag,and Au),which do not cause the Suzuki segregation may not decrease the SFE.Furthermore,it is interesting to find that the former alloying elements are located on the right of Cu group while the latter on the left of Cu group in the periodic table of elements.The intrinsic reasons for the new findings can be traced down to the valences electronic structure of solute and Cu atoms,i.e.,the similarity of valence electronic structure between solute and Cu atoms increases the value of SFE,while the difference decreases the value of SFE. | T.Cai K.Q.Li Z.J.Zhang P.Zhang R.Liu J.B.Yang Z.F.Zhang | 2020 | Journal of Materials Science & Technology2020，52，18： | 3 |
| 8 | Predictive fatigue crack growth law of high-strength steels显示文摘The fatigue resistance of metallic materials is generally attributed to both strength and toughness.Unfortunately,these properties are mutually exclusive in most materials.Classical theories like Paris’law only provide some data correlation schemes rather than a predictive capability,which cannot satisfactorily guide the anti-fatigue design.In this study,for the first time,the predictive fatigue crack growth rate law is proposed by considering the effects of both strength and toughness.Accordingly,a quantitative criterion is established for judging the fatigue crack resistance of high-strength steels.The predictive law would provide a unique view to the quantitative anti-fatigue design of metallic materials. | H.F.Li P.Zhang B.Wang Z.F.Zhang | 2022 | Journal of Materials Science & Technology2022，，5： | 2 |
| 9 | Effect of stress profile on microstructure evolution of cold-drawn commercially pure aluminum wire analyzed by finite element simulation显示文摘The evolution of microstructure in the drawing process of commercially pure aluminum wire(CPAW)does not only depend on the nature of materials, but also on the stress profile. In this study, the effect of stress profile on the texture evolution of the CPAW was systematically investigated by combining the numerical simulation and the microstructure observation. The results show that the tensile stress at the wire center promotes the formation of <111> texture, whereas the shear stress nearby the rim makes little contribution to the texture formation. Therefore, the <111> texture at the wire center is stronger than that in the surface layer, which also results in a higher microhardness at the center of the CPAW under axial loading. | Y.K.Zhu Q.Y.Chen Q.Wang H.Y.Yu R.Li J.P.Hou Z.J.Zhang G.P.Zhang Z.F.Zhang | 2018 | Journal of Materials Science & Technology2018，34，7： | 2 |
| 10 | Remarkably high fracture toughness of HfNbTaTiZr refractory high-entropy alloy显示文摘High-entropy alloys(HEAs)with face-centered cubic(FCC)phase such as CoCrFeMnNi or CoCrNi generally exhibit ultra-high fracture toughness but relatively low strength.In contrast,body-centered cubic(BCC)HEAs often display higher strengths,but the few reports on fracture toughness measurement demonstrate low toughness values.Here we show that the BCC HfNbTaTiZr refractory HEA,which possesses a combination of high strength,good tensile ductility and excellent high-temperature properties,also exhibits a remarkably high fracture toughness.By using the'single specimen'compliance method for J-integral measurement according to the ASTM E1820–17 standard,its fracture toughness K_(JIC)was experimentally determined to be 210 MPa m^(1/2),which renders this HEA among the toughest metallic materials.The excellent damage tolerance makes the HEA promising for applications as high-temperature structural materials such as in aerospace field. | X.J.Fan R.T.Qu Z.F.Zhang | 2022 | Journal of Materials Science & Technology2022，，28： | 1 |
| 11 | Corrigendum to “Examining the effect of the aging state on strength and plasticity of wrought aluminum alloys”[Journal of Materials Science & Technology 122 (2022) 54-67]显示文摘The authors are very sorry for their carelessness that there are some problems with Eq.(14)and the fund in the original manuscript.Firstly,Eq.(14)in the original manuscript is:k=k_(s)f^(O)_(sp)/f_(sp)+f^(C)_(sp)/f_(sp)=η(k s−1)+1,the latter step of Eq.(14)is repeated with Eq.(15),thus it should be deleted and Eq.(14)revised to k=k_(s)f^(O)_(sp)/f_(sp)+f^(C)_(sp)/f_(sp). | Z.Qu Z.J.Zhang J.X.Yan P.Zhang B.S.Gong S.L.Lu Z.F.Zhang T.G.Langdon | 2022 | Journal of Materials Science & Technology2022，，28： | 1 |
| 12 | Anisotropic Electroplastic Effects on the Mechanical Properties of a Nano-Lamellar Austenitic Stainless Steel显示文摘Effects of electropulsing treatment(EPT)on the microstructural evolution and mechanical properties of a cold-rolled 316 L austenitic stainless steel with nano-lamellar structure were investigated.The EPT experiments were carried out with the electric current direction along the rolling direction(RD)and the transverse direction(TD)of the samples,respectively.Significant anisotropic electroplastic effects for the RD and TD specimens,i.e.,reduced hardness/strength and enhanced ductility,were obtained owing to the different recrystallization behaviors of the RD and TD specimens during EPT.The RD specimens after EPT with larger recrystallized grain size and higher volume fraction of recrystallization show lower strength and higher elongation than that of the TD specimens.The main reason might be attributed to the change of the current direction in the two kinds of samples,which results in the different sensitivity of the microstructures to thermal and athermal effects during EPT. | Y.R.Ma H.J.Yang D.D.Ben X.H.Shao Y.Z.Tian Q.Wang Z.F.Zhang | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，4： | 1 |
| 13 | Intrinsic Strength Asymmetry Between Tension and Compression of Perfect Face-Centered-Cubic Crystals显示文摘The strength asymmetry between tension and compression is a typical case of mechanical response of materials.Here we achieve the intrinsic strength asymmetry of six face-centered-cubic perfect crystals(Cu,Au,Ni,Pt,Al and Ir)through calculating the ideal tensile and compressive strength with considering the normal stress effect and the competition between different crystallographic planes.The results show that both the intrinsic factors(the ideal shear strength and cleavage strength of low-index planes)and the orientation could affect the strength asymmetry,which may provide insights into understanding the strength of ultra-strong materials. | R.F.Wang J.Xu R.T.Qu Z.Q.Liu Z.F.Zhang | 2016 | Acta Metallurgica Sinica(English Letters)2016，29，8： | 0 |
| 14 | Foreword显示文摘As a new class of advanced materials,metallic glasses(also often referred as amorphous alloys)possess a combination of unique amorphous structure and remarkably impressive mechanical and physical properties,and are now at the cutting edge | W.H.Wang Z.F.Zhang | 2014 | Journal of Materials Science & Technology2014，30，6： | 0 |
| 15 | Microstructural Evolution and Mechanical Properties of Laminated CuAl Composites Processed by Accumulative Roll-Bonding and Annealing显示文摘Nano structured Cu-/Al-laminated composites were processed by accumulative roll-bonding(ARB)technique for four cycles.Microstructural evolutions inside the Cu and Al layers and the interfacial reactions were revealed after annealing at different temperatures.Recovery and recrystallization occurred in the Cu and Al layers at low annealing temperatures,and three kinds of intermetallic compounds formed near the interfaces.The mechanical properties of these composites after annealing were investigated by tensile tests,and the variation of strength-ductility synergy was comprehensively discussed by considering the roles of constituent and the intermetallic compounds. | H.R.Lin Y.Z.Tian S.J.Sun Z.F.Zhang | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，7： | 0 |
| 16 | Development of a PVA Hydrogel for Bioprosthetic Heart Valve Stent and Other Medical Applications显示文摘 | Z.F.Zhang | 2000 | 材料科学与工程学报2000，20，z2： | 0 |
| 17 | Examining the effect of the aging state on strength and plasticity of wrought aluminum alloys显示文摘A general rule of strength and plasticity was proposed for three typical wrought Al alloys(2xxx,6xxx,and 7xxx)subjected to different aging times.Investigations of the work-hardening processes and dislocation configurations in tensile and compressive testing reveal that this general rule arises because there is a common mechanism for these three kinds of wrought alloys whereby the tendency for cross-slip increases monotonously with aging time.By analyzing the strain hardening exponent and the stacking fault energy,it is demonstrated that the change in the dislocation slip mode is attributed mainly to the formation of second phases rather than to the matrix composition.Accordingly,a new work-hardening model was proposed for wrought Al alloys containing second phases and this explains the interaction between dislocations and second phases and other relevant experimental phenomena.This work is therefore beneficial for quantitatively investigating and optimizing the strength and plasticity of wrought aluminum alloys. | Z.Qu Z.J.Zhang J.X.Yan P.Zhang B.S.Gong S.L.Lu Z.F.Zhang T.G.Langdon | 2022 | Journal of Materials Science & Technology2022，，27： | 0 |
| 18 | Design and optimization of the composition and mechanical properties for non-equiatomic CoCrNi medium-entropy alloys显示文摘The development of multi-principal element alloys(MPEAs,also called as high-or medium-entropy al-loys,HEAs/MEAs)provides tremendous possibilities for materials innovation.However,designing MPEAs with desirable mechanical properties confronts great challenges due to their vast composition space.In this work,we provide an essential criterion to efficiently screen the CoCrNi MEAs with outstanding strength-ductility combinations.The negative Gibbs free energy difference△E_(FCC-BCC)between the face-centered cubic(FCC)and body-centered cubic(BCC)phases,the enhancement of shear modulus G and the decline of stacking fault energy(SFE)γ_(isf)are combined as three requisites to improve the FCC phase stability,yield strength,deformation mechanisms,work-hardening ability and ductility in the criterion.The effects of chemical composition on△E_(FCC-BCC),G andγisf were investigated with the first principles calculations for Co_(x)Cr_(33)Ni_(67-x),Co_(33)Cr_(y)Ni_(67-y)and Co_(z)Cr_(66-z)Ni_(34)(0≤x,y≤67 and 0≤z≤66)alloys.Based on the essential criterion and the calculation results,the composition space that displays the neg-ative Gibbs free energy difference△E_(FCC-BCC),highest shear modulus G and lowest SFEγ_(isf)was screened with the target on the combination of high strength and excellent ductility.In this context,the optimal composition space of Co-Cr-Ni alloys was predicted as 60 at.%-67 at.%Co,30 at.%-35 at.%Cr and 0 at.%-6 at.%Ni,which coincides well with the previous experimental evidence for Co_(55)Cr_(40)Ni_(5)alloys.The valid-ity of essential criterion is further proved after systematic comparison with numerous experimental data,which demonstrates that the essential criterion can provide significant guidance for the quick exploitation of strong and ductile MEAs and promote the development and application of MPEAs. | J.X.Yan Z.J.Zhang P.Zhang J.H.Liu H.Yu Q.M.Hu J.B.Yang Z.F.Zhang | 2023 | Journal of Materials Science & Technology2023，，8： | 0 |
| 19 | Fatigue Properties Improvement of Low-Carbon Alloy Axle Steel by Induction Hardening and Shot Peening:A Prospective Comparison显示文摘Fatigue fracture is the major threat to the railway axle, which can be avoided or delayed by surface strengthening. In this study, a low-carbon alloy axle steel with two states was treated by surface induction hardening and shot peening, respectively, to reveal the mechanism of fatigue property improvement by microstructure characterization, microhardness measurement, residual stress analysis, roughness measurement, and rotary bending fatigue tests. The results indicate that both quenching and tempering treatment can effectively improve the fatigue properties of the modified axle steel. In addition, induction hardening can create an ideal hardened layer on the sample surface by phase transformation from the microstructure of ferrite and pearlite to martensite. By comparison, shot peening can modify the microstructure in surface layer by surface severe plastic deformation introducing a large number of dislocation and even cause grain refinement. Both induction hardening and shot peening create compressive residual stress into the surface layer of axle steel sample, which can effectively reduce the stress level applied to the metal surface during the rotary bending fatigue tests. On the whole, the contribution of induction hardening to the fatigue life of axle steel sample is better than that of the shot peening, and induction hardening shows obvious advantages in improving the fatigue life of axle steel. | G.C.Chu F.Z.Hu X.J.jin Y.Zhang Q.Wang J.P.Hou Z.F.Zhang | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，8： | 0 |
| 20 | High-temperature fatigue strength of grain boundaries with different misorientations in nickel-based superalloy bicrystals显示文摘Nickel-based single-crystal superalloys are widely used in the manufacture of aeroengine turbine vanes for their excellent high-temperature performance. Low-angle grain boundaries (LAGBs) will be generated inevitably during their manufacture, which are often characterized by grain boundary misorientation (GBM) and will weaken the mechanical properties of superalloys. However, the relationship between GBM and the fatigue properties of superalloys at elevated temperatures has seldom been investigated due to the difficulty in the sample preparation and experiment process. Based on six kinds of bicrystals with different tilt LAGBs made by a second-generation single-crystal superalloy, the effects of misorientation on the grain boundary microstructure and fatigue properties (980 °C) of superalloys were studied systematically in this work. It is found that, with the increase of GBM, the GB precipitates combined with the cast micropores increase monotonically, accordingly both the fatigue life and fatigue strength decrease successively. Fatigue fracture observations show that the cracks of all the bicrystals initiated from the cast micropores at GBs, and then propagated along the GBs. Therefore, the coupling effect of cast micropores and GBM on the fatigue damage mechanisms of the bicrystals are evaluated according to their hindering degrees on the piled-up dislocations. Combining with a hysteresis energy model, a quantitative fatigue strength prediction model of superalloys is established and is well verified by abundant experimental data. This study could provide guidance for fatigue performance prediction and structural design of superalloys. | D.F.Shi Z.J.Zhang Y.H.Yang Y.Z.Zhou R.Liu P.Zhang Z.F.Zhang | 2023 | Journal of Materials Science & Technology2023，，23： | 0 |
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