TA15钛合金两类组织对疲劳性能和断裂韧度的影响  

Effect of Structure on Fatigue Properties and Fracture Toughness for TA15 Titanium Alloy

作　　者：张庆玲[1] 李兴无[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《材料工程》2007年第7期3-5,共3页Journal of Materials Engineering

摘　　要：研究了TA15钛合金片状和双态两种典型组织对疲劳性能和断裂韧度的影响,结果表明:在S-N曲线的高应力区,双态组织的疲劳强度高于片状组织;在低应力区,情况则相反,且片状组织的疲劳极限(656MPa)高于双态组织(565MPa)。片状组织的疲劳裂纹扩展速率低于双态组织,且断裂韧度K1C高于双态组织,即片状组织的损伤容限性能优于双态组织。Effect of lamellar and bi-modal structure on fatigue properties and fracture toughness have been investigated for TA15 titanium alloy. The results show that fatigue strength of bi-modal structure is higher than lamellar structure in the low cycle region, however the fatigue limit of lamellar structure is higher than bi-modal structure in the high cycle. The damage tolerance properties of lamellar are better than bi-modal structure, i.e. fracture toughness is higher and crack growth rate is lower of lamellar structure.

关 键 词：钛合金 片状组织 双态组织 疲劳性能 断裂韧度 

分 类 号：TG113.25[金属学及工艺—物理冶金]