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| 1 | Enhancing strength and creep resistance of Mg-Gd-Y-Zn-Zr alloy by substituting Mn for Zr显示文摘The age-hardening behavior and mechanical properties of the extruded Mg-2Gd-1.2Y-0.5Zn(at.%)alloy with Zr or Mn additions were investigated.The results show that Mn added alloy exhibits more remarkable age-hardening response than Zr added alloy,which is attributed to the fact that partitioning of Mn into the β'phases,β'precipitates and long period stacking ordered(LPSO)phases leads to the decrement in(G d+Y)concentrations in the second phases,facilitating the precipitation during aging treatment.Both peak-aged alloys show bimodal microstructure comprising the fine DRXed grains with nano-sized β phases pinned at DRXed grain boundaries as well as coarse worked grains with strong fiber texture.High strength and good thermal stability were obtained in both peak-aged Mn and Zr added alloys.While the peak-aged Mn added alloy shows higher strength and superior creep resistance due to its denser β'precipitates,thin LPSO phases and γ'precipitates and higher area fraction of worked grains with strong fiber texture.The 0.2% tensile proof stress and ultimate tensile strength of peak-aged Mn added alloy reach up to 454 MPa and 508 MPa,respectively,with elongation of 3.2%at room temperature.The minimum creep rate of the peak-aged Mn added alloy at 250℃/150 MPa is 2.4 × 10^-8 s^-1,which is superior than previously reported extruded Mg-Gd based alloys. | C.Xu T.Nakata G.H.Fan X.W.Li G.Z.Tang S.Kamado | 2019 | Journal of Magnesium and Alloys2019，7，3： | 14 |
| 2 | Microstructures and mechanical properties of friction stir processed Mge2.0Nde0.3Zne1.0Zr magnesium alloy显示文摘The effect of Friction stir process(FSP)parameters on the microstructure and mechanical properties of an extruded Mge2.0Nde0.3Zne1.0Zr(wt.%)alloy was investigated in this paper.The alloy was friction stir processed with different passes:single-pass,three-pass and five-pass,under a tool rotation rate of 800μm and a traverse speed of 200 mm min^(-1).FSP results in remarkable grain refinement of the extruded alloy(average grain size w3.8 mm as 3 passes)and almost complete dissolution of the Mg_(12)Nd phase in the matrix.With the increase of pass,the average grain size in the stir zone(SZ)is decreased firstly and then increases.The Vikers hardness of SZs in all FSPed samples is higher than that of the parent material(PM).Tensile tests at room-temperature show that the tensile strengths of the stir zones along the FSP advancing direction are slightly lower than those of PM.However,the elongations are remarkably improved from 13.0%for PM to 24.5%for SZ FSPed with three-passes.These improved tensile properties are attributed to the microstructure refinement,dynamic recrystallization and dissolution of the Mg_(12)Nd phase. | F.Y.Zheng Y.J.Wu L.M.Peng X.W.Li P.H.Fu W.J.Ding | 2013 | Journal of Magnesium and Alloys2013，1，2： | 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 | Effect of forced-air cooling on the microstructure and age-hardening response of extruded Mg-Gd-Y-Zn-Zr alloy full with LPSO lamella显示文摘The homogenized Mg-8.2 Gd-3.8 Y-1.0 Zn-0.4 Zr(wt.%)alloy full of plate-shaped long period stacking ordered(LPSO)phases was hot extruded in the atmosphere and cooled by the forced-air,then the effect of forced-air cooling on the microstructure and age-hardening response of the alloy was investigated in this work.The results show that in comparison with the extruded sample cooling in the atmosphere,the forced-air cooling restricts dynamic recrystallization(DRX)and brings about finer dynamic recrystallized(DRXed)grain size,stronger basal texture and higher dislocation density.Furthermore,the forced-air cooling promotes the dynamic precipitation in the DRXed regions and facilitates formation of plate-shaped LPSO phases andγ’phases with smaller interspacing in the unrecrystallized(un DRXed)regions,then slightly restricts the precipitation ofβphases during aging.After peak-ageing treatment,the extruded sample with forced-air cooling shows superior tensile properties with a tensile yield strength of 439 MPa,an ultimate tensile strength of 493 MPa,and elongation to failure of 18.6%. | S.Z.Wu T.Nakata G.Z.Tang C.Xu X.J.Wang X.W.Li X.G.Qiao M.Y.Zheng L.Geng S.Kamado G.H.Fan | 2021 | Journal of Materials Science & Technology2021，，14： | 6 |
| 5 | Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys显示文摘Evolution of the morphology of MC carbides with the change of cooling rate and carbon content in two kinds of nickel-base superalloys, K417 G and DD33, has been investigated. The morphology of MC carbides evolves from faceted to script-like with increasing cooling rate. Varying the carbon content from 40X10-6 to 320X10-6, the morphology of carbides changes from blocky, rod-like into script-like. Scanning electron microscopy observation of deep-etched samples indicates that these carbides evolve from octahedral to dendritic and then into welldeveloped dendrites accordingly in a three-dimensional manner. The morphology evolution is discussed from the viewpoint of the preferential growth orientation of fcc crystals and the carbide growth rate during directional solidification. | X.W.Li L.Wang J.S.Dong L.H.Lou | 2014 | Journal of Materials Science & Technology2014，30，12： | 4 |
| 6 | Thickness-dependent mechanical properties of nacre in Cristaria plicata shell:Critical role of interfaces显示文摘The thickness dependence of mechanical properties of nacre in Cristaria plicata shell was studied under three-point bending tests.The results show that the mechanical behavior of nacre exhibits a strong thickness dependence.The bending strength firstly increases with the increase of specimen thickness and then becomes roughly constant as the thickness reaches a certain value of∼2.5mm.However,the mean value of work per unit volume increases constantly with increasing specimen thickness;meanwhile,the cracking mode changes from penetration into the platelets to deflection along the interfaces.The theoretical analyses indicate that the thickness-dependent mechanical properties of nacre are mainly caused by the variation in the number of inter-lamellar interfaces.The more the number of inter-lamellar interfaces is,the higher the strength and work of fracture of nacre under bending tests will be.However,as the number of inter-lamellar interfaces reaches a certain value(e.g.,in the present specimen with 2.5mm thickness),the strength tends to remain constant,while the work of fracture still increases.Therefore,the present research findings are expected to provide a valuable guidance for the interfacial design of nacre-like materials with high strength and toughness. | S.M.Liang H.M.Ji X.W.Li | 2020 | Journal of Materials Science & Technology2020，44，9： | 2 |
| 7 | Numerical Analysis of Roll Deflection for Sendzimir Mill显示文摘 | H.L.Yu X.H.Liu G.T.Lee X.W.Li H.D.Park | | 0，，： | 1 |
| 8 | A pathway to improve low-cycle fatigue life of face-centered cubic metals via grain boundary engineering显示文摘To probe a pathway to improve the low-cycle fatigue life of face-centered cubic(FCC)metals via grain boundary engineering(GBE),the tension-tension fatigue tests were carried out on the non-GBE and GBE Cu-16 at.%Al alloys at relatively high stress amplitudes.The results indicate that the cyclic strain localiza-tion and cracking at grain boundaries(GBs)can be effectively suppressed,especially at increased stress amplitude,by an appropriate GBE treatment that can result in a higher resistance to GB cracking and a greater capability of compatible deformation.Therefore,the sensitivity of fatigue life to stress amplitude can be weakened by GBE,and the low-cycle fatigue life of Cu-16 at.%Al alloys is thus distinctly improved. | X.J.Guan Z.P.Jia S.M.Liang F.Shi X.W.Li | 2022 | Journal of Materials Science & Technology2022，，18： | 0 |
| 9 | Orientation dependence of deformation twinning in Cu single crystals显示文摘Cu single crystals were subjected to dynamic compression plastic deformation to investigate orientationdependent twinning.The experimental results showed that twinning is closely related to the ratio of the maximum Schmid factor for twinning partial(m_T)to the maximum Schmid factor for perfect dislocation(m_S),i.e.,m_T/m_S,rather than m_T.The twin volume fraction V_Tincreases with the m_T/m_Svalue and the most favorable orientation for twinning has the maximum m_T/m_Svalue(1.15).The relationships of m_T/m_Swith both effective stacking fault energy γ_(eff)and threshold stress for twinning τ_Twere established for understanding orientation-dependent twinning.Further insights into the orientation-dependent twinning and guidance for developing bulk high density nanotwinned materials are provided. | S.S.Cai X.W.Li N.R.Tao | 2018 | Journal of Materials Science & Technology2018，34，8： | 0 |
| 10 | Effect of Grain Boundary Engineering on the Work Hardening Behavior of AL6XN Super‑Austenitic Stainless Steel显示文摘To examine the influence of grain boundary engineering(GBE)on the work hardening behavior,the tensile tests were carried out on the non-GBE and GBE AL6XN super-austenitic stainless steel(ASS)samples with a comparable grain size at two strain rates of 10^(-2)s^(-1)and 10^(-4)s^(-1).The evolution of deformation microstructures was revealed by transmission electron microscopy(TEM)and quasi-in situ electron backscatter diffraction(EBSD)observations.The results show that the influence of GBE on the mechanical properties of AL6XN super-ASS is mainly manifested in the change of work hardening behavior.At the early stage of plastic deformation,GBE samples show a slightly lowered work hardening rate,since the special grain boundaries(SBs)of a high fraction induce a higher dislocation free path and a weaker back stress;however,with increasing plastic deformation amount,the work hardening rate of GBE samples gradually surpasses that of non-GBE samples due to the better capacity of maintainable work hardening that is profited from the inhibited dislocation annihilation by SBs.In a word,the enhanced capacity of sustained work hardening effectively postpones the appearance of necking point and thus efficaciously ameliorates the ductility of GBE samples under the premise of little changes in yield strength and ultimate tensile strength. | X.J.Guan Z.P.Jia M.A.Nozzari Varkani X.W.Li | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，4： | 0 |
| 11 | A high-strength and high-toughness nacreous structure in a deep-sea Nautilus shell:Critical role of platelet geometry and organic matrix显示文摘To explore the differences in mechanical behavior of nacre between shells that live in different water depths,the microstructures,phase composition and related mechanical properties of nacre under indentation,three-point bending and shear tests in deep-sea Nautilus and freshwater Cristaria plicata shells were systematically investigated.It is found that the nacreous structure in Nautilus shell exhibits an outstanding combination of high strength and high toughness compared with that in C.plicata shell,attributing to its larger aspect ratio of platelet and interfacial shear resistance.Specifically,the interfacial resistance is mainly generated from the adhesion of organic matrix and friction caused by nano-asperities on platelet surfaces.According to the interfacial resistance model,the stiction force originated from organic matrix adhesion is sensitive to its content,and the friction force produced by nano-asperities presents a positive correlation with their distribution density and dimension.Hence,the higher content of organic matrix of nacre with denser and larger nano-asperities on platelet surfaces in Nautilus shell contributes to a higher interfacial resistance.Therefore,it is the coupled effects of platelet geometries(i.e.aspect ratio and nano-asperity)and organic matrix that result in the high-strength and high-toughness nacreous structure in Nautilus shell,which is thus more conductive to inhabit in the deep sea with extremely high pressure.The present research findings are expected to provide beneficial references for the design of strong and tough nacre-inspired materials with appropriate platelet geometry and content of soft phase. | S.M.Liang H.M.Ji X.W.Li | 2021 | Journal of Materials Science & Technology2021，，29： | 0 |
| 12 | Microstructure-Related Mechanical Properties of Nacre in Pinctada Shell显示文摘Biological materials with various outstanding properties have been studied for a long time by investigators.As a kind of natural biological material,sea shells exhibiting the complexity and unique architectures have drawn much attention in recent years.In the present work,Pinctada shell was selected as the target material,and its | S.X.Yan H.M.Ji X.Wang X.W.Li | 2016 | 功能材料信息2016，13，4： | 0 |
| 13 | Improving Intergranular Stress Corrosion Cracking Resistance in a Fe–18Cr–17Mn–2Mo–0.85N Austenitic Stainless Steel Through Grain Boundary Character Distribution Optimization显示文摘The grain boundary character distribution(GBCD) optimization and its effect on the intergranular stress corrosion cracking(IGSCC) resistance in a cold-rolled and subsequently annealed Fe-18 Cr-17 Mn-2 Mo-0.85 N high-nitrogen nickel-free austenitic stainless steel were systematically explored.The results show that stacking faults and planar slip bands appearing at the right amount of deformation(lower than 10%) are beneficial cold-rolled microstructures to the GBCD optimization.The proportion of special boundaries gradually increases in the subsequent stages of recrystallization and grain growth,accompanying with the growth of twin-related domain in the experimental steel.In this way,the fraction of low ∑ coincidence site lattice(CSL) boundaries can reach as high as 82.85% for the specimen cold-rolled by 5% and then annealed at 1423 K for 72 h.After GBCD optimization,low ∑ CSL boundaries and the special triple junctions(J2,J3) of high proportion can greatly hinder the nitride precipitation along grain boundaries and enhance the capability for intergranular crack arrest,thus improving the IGSCC resistance of the experimental steel. | F.Shi L.Yan J.Hu L.F.Wang T.Z.Li W.Li X.J.Guan C.M.Liu X.W.Li | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，11： | 0 |
| 14 | Short-range ordering plays a determining role in the low-cycle fatigue life improvement of fcc metals: A conclusive study on low solid-solution hardening Ni-Cr alloys显示文摘The effect of short-range ordering (SRO) on the low-cycle fatigue (LCF) behavior of low solid-solution hardening Ni-Cr alloys with high stacking fault energies (SFEs) was systematically studied under cycling at constant total strain amplitude (Δε t /2) in the range of 0.1%–0.7%. The results show that an inducement of SRO structures can notably improve the fatigue life of the alloy regardless of Δε t /2, and several unique fatigue characteristics have been detected, including the transition of fatigue cracking mode from intergranular cracking to slip band cracking, the non-negligible evolution from non-Masing behavior in pure Ni to Masing behavior in the Ni-40Cr alloy, and the secondary cyclic hardening behavior in the Ni-10Cr and Ni-20Cr alloys. All these experimental phenomena are tightly associated with the transformation in cyclic deformation mechanisms that is induced by SRO based on the “glide plane softening” effect. Furthermore, a comprehensive fatigue life prediction model based on total hysteresis energy has been reasonably proposed, focusing on the analyses of the macroscopic model parameters (namely the fatigue cracking resistance exponent β and the crack propagation resistance parameter W 0 ) and microscopic damage mechanisms. In brief, on the premise that the effects of SFE and friction stress can be nearly ignored, as in the case of the present low solid-solution hardening Ni-Cr alloys with high SFEs, an enhancement of SRO in face-centered cubic metals has been convincingly confirmed to be an effective strategy to improve their LCF performance. | Y.J.Zhang D.Han X.W.Li | 2023 | Journal of Materials Science & Technology2023，，25： | 0 |
| 15 | A high specific Young's modulus steel reinforced by spheroidal kappa-carbide显示文摘1.Introduction High strength steels continue to be developed for automotive applications to increase safety and reduce lightweight by downgauging[1,2].In addition,reducing density is another solution for the lightweight of automotive components[3,4].Aluminum addition could effectively reduce the density of steels,since it has a low atomic mass and invokes a lattice expansion[5]. | P.Chen J.Fu X.Xu C.Lin J.C.Pang X.W.Li R.D.K.Misra G.D.Wang H.L.Yi | 2021 | Journal of Materials Science & Technology2021，，28： | 0 |
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