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| 1 | 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 |
| 2 | 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 |
| 3 | 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 |
| 4 | Mechanism transition of cross slip with stress and temperature in face-centered cubic metals显示文摘A<110>/2 screw dislocation is commonly dissociated into two <112>/6 Shockley partial dislocations on{111} planes in face-centered cubic metals.As the two partials are not purely screw,different mechanisms of cross-slip could take place,depending on the stacking fault energy,applied stress and tempe rature.It is crucial to classify the mechanisms of cross-slip because each mechanism possesses its own reaction path with a special activation process.In this work,molecular dynamics simulations have been performed systematically to explore the cross-slip mechanism under different stresses and temperatures in three different metals Ag,Cu and Ni that have different stacking fault energies of 17.8,44.4 and 126.8 mJ/m^2,re spectively.In Ag and Cu with low stacking fault energy,it is observed that the cross-slip mechanism of screw dislocations changes from the Fleischer obtuse angle(FLOA),to the Friedel-Escaig(FE),and then to the FL acute angle(FLAA) at low temperatures,with increasing the applied stress.However,when the temperature increases,the FE mechanism gradually becomes dominant,while the FLAA only occurs at the high stress region.In particular,the FLOA has not been observed in Ni because of its high stacking fault energy. | K.Q.Li Z.J.Zhang J.X.Yan J.B.Yang Z.F.Zhang | 2020 | Journal of Materials Science & Technology2020，54，22： | 0 |
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