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Characteristics of Faigue Crack Initiation inTi-5Al-4Sn-2Zr-1Mo-0.7Nd-0.25Si Alloy

Jiafeng LEP , Yuyin LIU , Shaoxuan GUAN , Qingjiang WANG , Zhongguang WANG , Dong LI and Zhuangqi HU(State Key Lab. for Fatigue and Fracture of Materials , Institute of Metal Research , Chinese Academy of Sciences , Shenyan 110015 , China)

材料科学技术(英)

The characteristics of fatigue crack initiation in Ti-5AI-4Sn-2Zr1Mo-O.7Nd-O.25Si alloy wereStudied. Two modes Of fatigue crack initiation were found. The Nd-rich phase particles displaybetter resistance to fatigue crack initiation than the matrix at lower stress.

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Optimal Selection and Control for Precipitation of α2 Phase in Near α High Temperature Ti Alloys during Aging Treatment

Jun ZHANG , Qingjiang WANG , Yuyin LIU , Li LI , Dong LI

材料科学技术(英)

The characteristic of the precipitation and growth of α2 ordered phase during aging treatment in near αTi alloys have been investigated in terms of the influences of aging temperature, aging time and aging manner. The results exhibit that aging temperatures influence the distribution ofα2 phase precipitated and cause the changes in growth speed ofα2 phase. For various aging temperatures, the time to finish precipitation ofα2 phase is different. The facts that various distribution characteristics and growth speed ofα2 ordered phase are caused by changed aging condition imply optimal selection and control for precipitation ofα2 ordered phase reachable. Some discussions on adoptable aging steps are presented.

关键词: α2 ordered phase , null , null

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