航空材料学报2017，Vol.37Issue(5)：77-82,6.DOI:10.11868/j.issn.1005-5053.2017.000075
一种TiAl合金高温低循环疲劳性能及失效机理
High Temperature Low Cycle Fatigue Properties and Failure Mechanism of a TiAl Alloy
摘要
Abstract
Total strain range controlled low cycle fatigue (LCF)experiments were conducted at 750 ℃ to investigate the effects of the duplex and fully lamellar microstructure on fatigue behavior and life of a TiAl alloy,and the total strain range-life equation was em-ployed to predict LCF life of the alloy.The results show that the mean stress produced at hysteresis loop of TiAl alloy with DP is less that of TiAl alloy with FL at the same temperature and applied strain.The total strain range-life equation is able to predict the fatigue life of the alloy,and the predicted life is located between ±2 scatter band of the experimental life.In addition,the fatigue source of TiAl alloy with DP is located near center of the specimen while that of TiAl alloy with FL is located on subsurface of the specimen,and the failure mechanisms are obviously different between the two types of the TiAl alloy.关键词
TiAl合金/低循环疲劳/寿命预测/迟滞回线/失效机理Key words
TiAl alloy/low cycle fatigue (LCF)/life prediction/hysteresis loop/failure mechanism分类
矿业与冶金引用本文复制引用
董成利,于慧臣,焦泽辉,孔凡涛,陈玉勇..一种TiAl合金高温低循环疲劳性能及失效机理[J].航空材料学报,2017,37(5):77-82,6.基金项目
国家自然科学基金-青年基金(51401195 ) （51401195 ）
国家973 计划课题(2011CB605501) （2011CB605501）
航空基金(2013ZF21014) （2013ZF21014）
