Geometrical Scale-Sensitive Fatigue Properties of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloys With α/β Lamellar Microstructures  

作　　者：B.Zhang Z.M.Song L.M.Lei L.Kang G.P.Zhang 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University [2]Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences [3]AVIC Commercial Aircraft Engine Co., Ltd.

出　　处：《Journal of Materials Science & Technology》2014年第12期1284-1288,共5页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 51071158);partially supported by the National Natural Science Foundation of China (Nos. 51171045 and 51371047);the National Basic Research Program of China (No. 2010CB631003)

摘　　要：Fatigue properties of the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy sheets containing different numbers of α/β Widmansttten colonies in the thickness direction of the sheets were investigated by tensionetension fatigue testing. It is found that fatigue properties of the Ti alloy either in low- or high-stress amplitude regimes become more sensitive to the sheet thickness of the Ti alloy as the sheet thickness is comparable to the length scale of the Widmansttten colonies. The basic mechanism of such length scale-sensitive fatigue properties in the Ti alloy was elucidated.Fatigue properties of the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy sheets containing different numbers of α/β Widmansttten colonies in the thickness direction of the sheets were investigated by tensionetension fatigue testing. It is found that fatigue properties of the Ti alloy either in low- or high-stress amplitude regimes become more sensitive to the sheet thickness of the Ti alloy as the sheet thickness is comparable to the length scale of the Widmansttten colonies. The basic mechanism of such length scale-sensitive fatigue properties in the Ti alloy was elucidated.

关 键 词：FATIGUE Ti alloy MICROSTRUCTURE Size effect 

分 类 号：TG146.23[一般工业技术—材料科学与工程] U416.217[金属学及工艺—金属材料]