Mg-4Zn-2Y合金的高温拉伸流变本构关系

doi:10.13251/j.issn.0254-6051.2022.08.003

金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 16-23.DOI: 10.13251/j.issn.0254-6051.2022.08.003

Mg-4Zn-2Y合金的高温拉伸流变本构关系

翟传田^1,2, 孙有平^1,2,3, 李旺珍^1,2,3, 何江美^1,2,3, 杨春洋^1,2

1.广西科技大学机械与交通工程学院, 广西柳州 545006;
2.广西土方机械协同创新中心, 广西柳州 545006;
3.广西科技大学广西汽车零部件与整车技术重点实验室, 广西柳州 545006

收稿日期:2022-03-18 修回日期:2022-06-04 出版日期:2022-08-25 发布日期:2022-09-19
通讯作者: 孙有平,教授,硕士生导师,E-mail:syptaiji@126.com
作者简介:翟传田(1995—),男,硕士研究生,主要研究方向为镁合金的热处理、轧制以及阻尼性能,E-mail:15563851750@163.com。
基金资助:
柳州市科技计划项目(2021CBA0102);广西高等学校高水平创新团队(桂教师范[2019]52号);广西自然科学基金(2018GXNSFBA281195); 广西研究生教育创新计划项目(YCSW2021323)

High temperature tensile flow constitutive equation of Mg-4Zn-2Y alloy

Zhai Chuantian^1,2, Sun Youping^1,2,3, Li Wangzhen^1,2,3, He Jiangmei^1,2,3, Yang Chunyang^1,2

1. School of Mechanical and Transportation Engineering, Guangxi University of Science and Technology, Liuzhou Guangxi 545006, China;
2. Guangxi Earthmoving Machinery Collaborative Innovation Center, Liuzhou Guangxi 545006, China;
3. Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou Guangxi 545006, China

Received:2022-03-18 Revised:2022-06-04 Online:2022-08-25 Published:2022-09-19

摘要/Abstract

摘要： 通过对轧制态Mg-4Zn-2Y合金在不同热变形温度以及应变速率下进行高温拉伸试验,研究了Mg-4Zn-2Y合金在不同工艺参数下进行热变形时流变应力的变化规律,并绘制了热加工图。结果表明,流变应力与变形温度以及应变速率均有关系,热变形温度不变时,材料的最大流变应力会随着应变速率的提高而增大;在应变速率不变时,材料的最大流变应力随着变形温度的升高会逐渐下降。采用双曲正弦修正的本构模型确定了轧制态Mg-4Zn-2Y合金的变形激活能Q=242 233.2 J·mol^-1,应力指数n=8.09。通过热加工图确定了Mg-4Zn-2Y合金的可加工区域为472.15~545.00 K,10^-3~10^-4 s^-1和545.00~672.15 K,10^-4~10^-1 s^-1。

关键词: Mg-4Zn-2Y合金, 高温拉伸, 流变行为, 本构方程

Abstract: By conducting high temperature tensile experiments on as-rolled Mg-4Zn-2Y alloy at different thermal deformation temperatures and strain rates, the flow stress changes of the Mg-4Zn-2Y alloy during thermal deformation under different process parameters were studied. And a processing map was drawn. The results show that the flow stress is related to the deformation temperature and strain rate. When the thermal deformation temperature is constant, the maximum flow stress of the alloy increases with the increase of strain rate. When the strain rate is constant, the maximum flow stress decreases as the deformation temperature increases. The deformation activation energy and stress index for the as-rolled Mg-4Zn-2Y alloy determined by using the hyperbolic sine modified constitutive model are Q=242 233.2 J·mol^-1 and n=8.09, respectively. The suitable hot working zones of the Mg-4Zn-2Y alloy determined by the processing map are 472.15-545.00 K, 10^-3-10^-4 s^-1 and 545.00-672.15 K, 10^-4-10^-1 s^-1.

Key words: Mg-4Zn-2Y alloy, high temperature tension, flow behavior, constitutive equation

中图分类号:

TG146.4

翟传田, 孙有平, 李旺珍, 何江美, 杨春洋. Mg-4Zn-2Y合金的高温拉伸流变本构关系[J]. 金属热处理, 2022, 47(8): 16-23.

Zhai Chuantian, Sun Youping, Li Wangzhen, He Jiangmei, Yang Chunyang. High temperature tensile flow constitutive equation of Mg-4Zn-2Y alloy[J]. Heat Treatment of Metals, 2022, 47(8): 16-23.

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Mg-4Zn-2Y合金的高温拉伸流变本构关系

High temperature tensile flow constitutive equation of Mg-4Zn-2Y alloy

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