Transactions of Materials and Heat Treatment

Title：Plastic deformation behavior of alloy 5A06 at high temperature

Authors： Ou Ling Pu Rong Zeng Fangxin Nie Yufeng Yang Jianjun

Unit： Hu′nan University of Technology

KeyWords： alloy 5A06 plastic deformation behaviors at high temperature processing map constitutive equation flow stress

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2018,43(6):123-128

Abstract：

The high temperature isothermal compressive experiments of alloy 5A06 were conducted by thermal simulation machine Gleeble-1500, and its plastic deformation behavior at high temperature was studied at deformation temperature 320-440 ℃, deformation rates 0.3, 1.0 and 10 s-1 respectively. Then, the characteristic parameters of the material were calculated and imported into the Arrhenius equation of the hyperbolic sine to obtain an constitutive equation represented by the ZenerHollomon parameter，and the relationship among the flow stress, deformation temperature and deformation rate was established to provide guidance for the formulation of hot working process. At the same time, it was concluded that the activation energy Q was 154.2 kJ·mol-1. Furthermore, according to the theory of DMM machining graph and the failure stability criterion of Prasad, the processing maps were drawn by superimposing the power dissipation map and the instability map under different deformation conditions. With the increase of deformation, the instability area increases. Thus, in the safe processing area, the efficiency of power dissipation is up to the maximum 32%-38% at the deformation rates 5-10 s-1, which is the best machining area.

Funds：

湖南省自然科学基金资助项目（2018JJ3121）；2016年度湖南省教育厅科学研究项目（16C0460）

欧玲（1982-），女，讲师，博士；Email：ouling24@126.com；通讯作者：聂宇峰（1980-），男，硕士，讲师；Email: aurberon@126.com

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