不同温度下Ti40合金的疲劳裂纹扩展行为  

Fatigue Crack Propagation Behavior of Ti40 Alloy at Different Temperatures

作　　者：吴欢[1] 赵永庆[1] 曾卫东[1] 李倩[2] 

机构地区：[1]西北工业大学,陕西西安710072 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2008年第8期1403-1406,共4页Rare Metal Materials and Engineering

基　　金：国家"973"计划资助项目(2007CB613807)

摘　　要：研究了Ti40合金在室温、300、500和600℃下的疲劳裂纹扩展行为,计算了Ti40合金在300、500、600℃下当△K为20MPam1/2时与裂纹扩展密切相关的表观激活能。结果表明:随温度升高,Ti40合金疲劳裂纹扩展速率增加;不同温度下的疲劳裂纹扩展曲线在△K为45.50MPam1/2处相交于一点。表观激活能值随温度升高先增加后减小,在500℃时达到最大,由此可见,500℃是Ti40合金热力学等性质发生变化的转折点。This paper presented the fatigue crack propagation behavior of Ti40 alloy at room temperature, 300, 500 and 600 ℃ and the apparent active energy of Ti40 alloy at 300, 500 and 600 ℃ was calculated when AK was 20 MPa.m1/z. The results indicated the fatigue crack propagation rate increased with temperature raise. All the fit lines of the fatigue crack propagation rate at various temperature intersected at one point when AK is 45.5 MPa.m1/z. The value of apparent activation energy increases at first with the increase of temperature, then decreases, which reaches the maximum at 500 ℃ indicating that the temperature 500 ℃ is a turning point of the thermodynamics properties in Ti40 alloy.

关 键 词：TI40合金 温度 疲劳裂纹扩展 表观激活能 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG111.8[金属学及工艺—金属材料]