变形温度对GWZ1031K镁合金高温拉伸变形行为的影响

doi:10.13251/j.issn.0254-6051.2021.01.001

摘要/Abstract

摘要： 通过高温拉伸试验,研究了GWZ1031K镁合金在250~400 ℃、变形速率为0.2 mm/min条件下的高温变形行为。使用扫描电镜(SEM)、X射线能谱分析(EDS)等方法对微观组织和拉伸断口进行观察。结果表明,在不同温度下,GWZ1031K镁合金的高温拉伸应力-应变曲线均出现峰值,峰值应力随变形温度的升高而减小,而塑性则随着变形温度的升高呈现非线性快速升高,特别是在400 ℃时合金出现超塑性现象。结合高温力学性能测试对应的微观组织和断口形貌分析可以得出,GWZ1031K镁合金在250~350 ℃的温度区间内,具有较好耐热性能(高温抗拉强度)。

关键词: GWZ1031K镁合金, 高温拉伸试验, 变形温度, 变形行为, LPSO相

Abstract: High temperature deformation behavior of GWZ1031K magnesium alloy was investigated by high temperature tensile test at 250-400 ℃ and the deformation rate of 0.2 mm/min.Scanning electron microscope (SEM) and X-ray energy spectroscopy (EDS) were used to observe the microstructure and tensile fracture.The results show that the peak value appears in all the high temperature tensile stress-strain curves at different temperatures,and the peak stress decreases with the increase of deformation temperature,meanwhile the plasticity increases sharply,particularly superplasticity occurs at 400 ℃.Combining the analyse of microstructure and fracture morphology,it can be concluded that the GWZ1031K magnesium alloy has good heat resistance in the temperature range from 250 ℃ to 350 ℃.

Key words: GWZ1031K magnesium alloy, high temperature tensile test, deformation temperature, deformation behavior, LPSO phase

中图分类号:

TG146.2

黄元春, 雒晓宇, 刘宇, 王旭, 王舟. 变形温度对GWZ1031K镁合金高温拉伸变形行为的影响[J]. 金属热处理, 2021, 46(1): 1-6.

Huang Yuanchun, Luo Xiaoyu, Liu Yu, Wang Xu, Wang Zhou. Effect of deformation temperature on high temperature tensile deformation behavior of GWZ1031K magnesium alloy[J]. Heat Treatment of Metals, 2021, 46(1): 1-6.

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