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

Journal of Magnesium and Alloys 2023年第2期11卷 522-532页

作者： Yao Cheng Adrien Chapuis Yunchang Xin Qing Liu Peidong Wu College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 210009China Department of Mechanical Engineering McMaster UniversityHamiltonOntario L8S 4L7Canada

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 *** 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

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A STUDY OF DIRECTIONALITY OF latent hardening BEHAVIOR IN ALUMINIUM SINGLE CRYSTALS

引用

Acta Mechanica Solida Sinica 1996年第3期9卷 246-252页

作者： Wang, MZ Shi, L Li, CH Xiao, JM UNIV SCI & TECHNOL BEIJING DEPT MAT PHYSBEIJING 100083PEOPLES R CHINA

By defining the yield stress in a latent hardening test as the first deviation from the elastic straight line, the yielding and hardening behavior on a latent system in the positive and negative slip direction was studied in aluminium single crystals. It is shown that the yield stresses on both the positive and negative latent systems are about equal to or a little lower than the maximum resolved shear stress in the primary test, but much higher than that of the active system. The Influence of relative orientation and prestrain on latent hardening and initial work-hardening in the secondary test was also investigated, and it was found that there is a considerable effect on initial work-hardening, but none on latent hardening. With reasonable approximation, a hardening rule for single crystal could be proposed from the experimental results, that is, except for the yield stress on the system negative to the active system that is very low, hardening on the other systems is nearly the same as self-hardening.

关键词： latent hardening work-hardening Bauschinger effect aluminium single crystal plastic deformation

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