摘要
采用光学显微镜和蠕变实验机研究Mg-9Gd-4Y-1Zn-0.5Zr合金在不同温度和应力下的高温蠕变行为。结果表明：在应力为70～130 MPa范围内,200℃时Mg-9Gd-4Y-1Zn-0.5Zr合金的蠕变应力指数n=1.63,蠕变机制为晶界滑动,250℃时蠕变应力指数n=2.63,蠕变机制为位错滑移;在蠕变温度为200～250℃范围内,应力分别为70、90、110和130 MPa时,合金的蠕变激活能Qc分别为108.5、118.9、127.6和134.3 k J/mol;随着温度和应力的增加,合金晶粒长大,合金的蠕变机制由晶界滑动控制转变为位错滑移控制。
The high temperature creep behavior of Mg-9Gd-4Y-1Zn-0.5Zr alloy under different temperatures and stresses was analyzed by means of optical microscope and creep test machine. The results show that under the stress of 70-130 MPa,the creep stress exponent n of the Mg-9Gd-4Y-1Zn-0.5Zr alloy is 1. 63 at 200 ℃,and the creep mechanism is grain boundary sliding; the creep stress exponent n is2. 63 at 250 ℃,and the creep mechanism is dislocation slip. Under the creep temperature of 200-250 ℃,when the stress values are 70,90,110 and 130 MPa,the creep activation energy（ Qc） values of the alloy are 108. 5,118. 9,127. 6 and 134. 3 k J/mol,respectively.With the increasing of temperature and stress,the grain size of the alloy grows and the creep mechanism of the alloy changes from grain boundary sliding to dislocation slip.
作者
孟波波
李全安
陈晓亚
李志涛
MENG Bo-bo;LI Quan-an;CHEN Xiao-ya;LI Zhi-tao(School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;Collaborative Innovation Center of Nonferrous Metals of Henan Province, Luoyang 471023, China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2018年第6期49-54,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51571084,51171059)
河南省重点科技攻关项目(152102210072)
河南科技大学第六届研究生创新基金(CXJJ-2016-ZR06)
