The Segregation of Chemical Composition in NiTi Shape Memeory Alloy Melted by VIM in Lime Crucible
(0) Binary NiTi shape memory alloy cast ingots with large scale size are produced by using vacuum induction melting (VIM) in lime crucible, the oxygen and carbon contents are less than 500ppm. Usually, oxygen was introduced into the melts by the dissolution of lime during melting, resulting in higher content of oxygen over 500ppm. VAR + VIM ingot metallurgy is prone to produce materials with a good chemical homogeneity. However, it is difficult for one single melting of NiTi by VIM in the lime crucible. So in the present paper, the segregation of chemical composition and the consistency of transformation temperature in NiTi alloys in as-casted condition along the cross-section area on edge and center, in homogeneization-treated condition, and in as-forged condition along the longitudinal-section area on head and tail, are measured and analyzed by differential scanning calorimetry (DSC), OM, SEM, and XRD, to indicate the chemical homogeneity in microscopic and macroscopic scale.
Shape Memory Alloy NiTi Biomedical Chemical Composition Transformation Temperature Segregation
Zhishan YUAN Zhaowei FENG Jiangbo WANG Weidong MIAO Chongjian LI Wei LIU
General Research Institute for Non-ferrous Metals, Grikin Advanced Materials Co., Ltd., No. 2,Xinjiekou Wai Street, Beijing, 100088, China
国际会议
重庆
英文
1315-1318
2008-06-09（万方平台首次上网日期，不代表论文的发表时间）