Mg-3Zn-0.3Ca-0.1Al-0.2Mn镁合金的热变形行为  

Thermal Deformation Behavior of Aged Mg-3Zn-0.3Ca-0.1Al-0.2Mn Magnesium Alloys

作　　者：陈策 王芳[1] 柳伟 侯华 CHEN Ce;WANG Fang;LIU Wei;HOU Hua(School ofMaterials Science and Engineering,Taiyuan University ofScience and Technology,Taiyuan Shanxi 030024,China;School ofMaterials Science and Engineering,North University ofChina,Taiyuan Shanxi 030051,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]中北大学材料科学与工程学院,山西太原030051

出　　处：《铸造设备与工艺》2024年第5期55-63,79,共10页Foundry Equipment & Technology

基　　金：国家自然科学基金资助项目(52205429,U23A20628,52375394,52275390,52201146);山西省重点研发计划资助项目(202102050201011,202202050201014);山西省基础研究计划资助项目(20210302124632);中央引导地方科技发展专项项目(YDZJSX2022A025)。

摘　　要：研究Mg-3Zn-0.3Ca-0.1Al-0.2Mn合金的热变形行为。在Gleeble-3800热压缩模拟试验机上进行热压缩试验,通过对不同热压缩试验参数下的真应力-真应变曲线进行分析,构建该合金的流变应力本构方程,并建立峰值应力下的热加工图;通过电子背散射衍射技术(EBSD)分析该合金热变形后再结晶及织构的演变规律。结果表明,该合金具有连续的动态再结晶特征,且流变应力随应变速率增大和变形温度减小而升高;通过双曲正弦函数修正的Arrhenius关系计算出其变形激活能Q=151.145 kJ/mol,应力指数n=4.149;通过Avrami方程计算出动态再结晶体积分数XDRX.通过热加工图分析确定其最适合热加工参数范围为:变形温度280℃~325℃,应变速率0.001 s^(-1)~1 s^(-1);EBSD检测结果表明在较高的变形温度以及较低的应变速率下变形时,再结晶更充分,合金的织构更弱。The thermal deformation behavior of Mg-3Zn-0.3Ca-0.1Al-0.2Mn alloy was studied.The hot compression test was carried out on Gleeble-3800 hot compression simulator.The flow stress constitutive equation and the hot working diagram of the alloy under peak stress were constructed by analyzing the true stress-strain curves under different hot compression test parameters.The recrystallization process and texture evolution of the alloy after thermal deformation were analyzed by electron backscattering diffraction(EBSD).The results show that the alloy has continuous dynamic recrystallization,and the flow stress increases with the increase of strain rate and the decrease of deformation temperature.The deformation activation energy Q=151.145 kJ/mol and stress index n=4.149 were calculated by the hyperbolic sinusoidal function modified Arrhenius relation.The dynamic recrystallization volume fraction XDRX was calculated by Avrami equation.The most suitable parameters for hot working were as follows:deformation temperature 280℃~325℃,strain rate 0.001 s^(-1)~1 s^(-1).EBSD test results show that the recrystallization is more complete and the texture of the alloy is weaker at higher deformation temperature and lower strain rate.

关 键 词：变形镁合金 热压缩 本构方程 热加工图 织构弱化 

分 类 号：TG146.22[一般工业技术—材料科学与工程]