Mg-3.5Zn-0.6Y-0.5Zr合金高温压缩变形行为  

Compressive deformation behavior of Mg-3.5Zn-0.6Y-0.5Zr alloy at high temperature

作　　者：任凤章[1,2] 高秋然[1] 祝要民[1] 苏娟华[1] 田保红[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471023

出　　处：《材料热处理学报》2014年第1期45-48,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51201061);河南省科技创新人才计划(104100510005);河南省重点攻关(092102210012)

摘　　要：采用Gleeble-1500D热模拟实验机，研究了Mg3．5Zn-0．6Y-0．5Zr合金在变形温度为300～450℃、变形速率为0．002～1s-1及变形量为50％的条件下的高温压缩变形行为，分析了流变应力与应变速率、变形温度的关系，计算了高温变形时变形激活能和应力指数，建立了该合金的本构方程。结果表明：Mg-3．5Zn-0．6Y-0．5Zr合金在热变形过程中真应力随着温度的升高而降低，真应力随着应变速率的升高而升高。该合金的流动应力可以用双曲正弦函数来描述。Hot compression tests of a Mg-3.5Zn-0. 6Y-0. 5Zr alloy were performed in the temperature range of 300 -450 ℃ on a Gleeble-1500D thermal simulator with the applied strain rate ranged from 0. 002 to 1 s-1 and the ultimate deformation of 50% of the gauge length. The relationship of flow stress with strain rate and deformation temperature was determined. The activation energy and stress exponent were calculated, and the constitutive equation was established. The results show that the true stress increases with increasing strain rate and decreasing deformation temperature in the hot compression process. The flow stress of the alloy can be described by a hyperbolic sine function.

关 键 词：Mg-Zn-Y系合金 流变应力 真应力-应变曲线 本构方程 

分 类 号：TG146.2[一般工业技术—材料科学与工程]