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Strain Softening and Hardening Behavior in az61 Magnesium alloy

Journal of Materials Science & Technology 2004年第6期20卷 691-693页

作者： Haitao ZHOU, Liufa LIU, Qudong WANG, Da LU, Xiaoqin ZENG and Wenjiang DINGNational Engineering Research Center of Light alloys Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China Ctr. of Light alloys Net Forming Sch. of Mat. Sci. and Eng. Shanghai Jiaotong Univ. Shanghai 200030 China

The deformation behavior of az61 mg alloy during hot deformation has been investigated in wide temperature and strain rate range by a Gleeble simulator. Specimens are deformed in compression in the temperature range of 523-673 K and at strain rates of 0.001-1 s-1. It is found that the flow curves exhibit a peak and then decrease towards steady-state of classical DRX, which decrease with rising temperature and decreasing strain rate. The deformation behavior of the specimens can be attributed to the occurrence of strain hardening and softening. As stress decreases, the strain hardening rate declines at a fast rate when temperature rises or strain rate decreases. The shapes of θ-σ curves indicate some important features such as subgrain formation, the criticai stress, the peak stress and steady stress. The onset of DRX can be determined by the point of inflection on θ-σ or Inθ-σ curves.

关键词： az61 mg alloy Recrystallization Strain hardening and softening

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Extraordinary mechanical properties of az61 alloy processed by ECAP with 160° channel angle and EPT

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Journal of Magnesium and alloys 2021年第2期9卷 548-559页

作者： Zhaohui Shan Jie Yang Jianfeng Fan Hua Zhang Qiang Zhang Yucheng Wu Weiguo Li Hongbiao Dong Bingshe Xu Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024P.R.China Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan 030024P.R.China Department of Engineering University of LeicesterLeicester LE17RHUK

az61 mg alloy with homogeneous refined microstructure and exceptional mechanical properties was obtained by the combined technology of equal-channel angular pressing(ECAP)and electropulsing treatment(EPT)in this *** on an ECAP die with an intersection angle of 160,the lower temperature is particularly adapted for az61 alloy to be deformed,in which accompanied by high accumulated defects *** recrystallization of EPTed samples during different stages indicated that the recrystallization behavior of the deformed mg alloy was mainly affected by the processing time and duration of *** to those of the as-received samples,the average grain size of the EPTed samples was refined from 89μm to 1.0μm,accordingly the yields stress(YS)and ultimate tensile strength(UTS)were increased from 100 MPa and 260 MPa to 330 MPa and 448 MPa,*** mechanisms of microstructure transformation and the reinforced mechanical properties were analyzed based on the strain of single ECAP,cumulative storage energy and the athermal effect of EPT.

关键词： az61 mg alloy Equal channel angular pressing Electropulsing treatment Recrystallization Mechanical properties

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Hot deformation behavior and flow stress modeling of annealed az61 mg alloys

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Progress in Natural Science:Materials International 2014年第2期24卷 253-265页

作者： Chinghao Liao Horngyu Wu Chengtao Wu Fengjun Zhu Shyong Lee Department of Mechanical Engineering National Central University Department of Mechanical Engineering Chung Hua University

In this study, the hyperbolic-sine type constitutive equation was used to model the flow stress of annealed az61 magnesium(mg) alloys. Hot compression tests were conducted at the temperatures ranging from 250 1C to 450 1C and at the strain rates ranging from 1 10–3s 1to 1 s 1on a Gleeble-3500 thermo-simulation machine. Constitutive equations as a function of strain were established through a simple extension of the hyperbolic sine constitutive relation. The effects of annealing heat treatments on the variations in constitutive parameters with strain were discussed. The hot compressive flow curves exhibited typical features of dynamic recrystallization. Multiple peak flow curves were observed in the annealed specimens upon testing at a strain rate of 1 10 1s–1and at various temperatures. Variations in constitutive parameters with strain were related to flow behavior and dependent on the initial conditions of the test specimens. The flow stresses of annealed az61 mg alloys were predicted well by the strain-dependent constitutive equations of the hyperbolic sine function under the deformation conditions employed in this study.

关键词： az61 mg alloy Constitutive analysis Dynamic recrystallization Flow stress modeling Strain-dependent constitutive parameters

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