Mg-3Al-1Zn alloy deformed along different strain paths: Role of latent hardening  

作　　者：Yao Cheng Adrien Chapuis Yunchang Xin Qing Liu Peidong Wu 

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 210009,China [3]Department of Mechanical Engineering,McMaster University,Hamilton,Ontario L8S 4L7,Canada

出　　处：《Journal of Magnesium and Alloys》2023年第2期522-532,共11页镁合金学报（英文）

基　　金：National Natural Science Foundation of China (51871032, 52071039 and 51671040);the 111 Project (B16007) of the Ministry of Education。

摘　　要：The mechanical properties of magnesium alloy AZ31 were investigated experimentally with visco-plastic self-consistent modeling. Tension,compression and plane strain compression(PSC) tests were performed along 3 directions of a hot rolled plate, and the material parameters input in the model were fitted with the uniaxial stress-strain curves. The critical resolved shear stress(CRSS) for tension twinning was modeled with a modified Voce hardening law first decreasing, and then increasing with strain, that could reproduce better the flow stress for twin-predominant deformation. Such CRSS evolution may better model twin nucleation, propagation and growth. Firstly simulations were carried out assuming latent hardening coefficients for slip by other slip systems equal to self-hardening. Then different heterogeneous latent hardening were used, whose values were based on dislocation dynamics simulations from the literature. This study shows that equal self and latent hardening can reproduce the stress strain curves and plastic anisotropy as well as heterogeneous mode on mode latent hardening.Discrepancies between simulations and experimental results from PSC are explained by an under-estimation of twinning for some PSC strain paths.

关 键 词：Crystal plasticity Mg alloy Mechanical properties Latent hardening 

分 类 号：TG146[一般工业技术—材料科学与工程]