Effect of Ta on Microstructures and Mechanical Properties of NiTi Alloys

被引:6
|
作者
Cai, S. [1 ]
Mitchell, S. G. [1 ]
Wang, L. [2 ]
Schaffer, J. E. [1 ]
Ren, Y. [3 ]
机构
[1] Ft Wayne Met Res Prod Corp, 9609 Ardmore Ave, Ft Wayne, IN 46809 USA
[2] Beijing Inst Technol, 5 South Zhongguancun St, Beijing 100081, Peoples R China
[3] Argonne Natl Lab, Xray Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA
关键词
TRANSFORMATION BEHAVIOR; PHASE-TRANSFORMATION; TANTALUM; REFINEMENT;
D O I
10.1007/s40830-019-00228-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Microstructures and mechanical properties of NiTiTa alloys with Ta contents of 5, 10 and 15 at.% were studied. It is found that, above the solubility limit of Ta, NiTiTa alloys consist of beta-Ta, (TaTi)(2)Ni, Ti4Ni2O oxide and NiTi matrix. (TaTi)(2)Ni phase has a tetragonal crystal structure. It is brittle and broke up during processing. Ta in solution largely increases the phase transformation temperatures, while the extra Ta that forms secondary phases affects the phase transformation through its influence on residual internal energy. The volume fraction of beta-Ta increases with increasing Ta content. Its ductility appears to be limited by tramp oxygen absorption. Although Ta addition largely improves the radiopacity of NiTiTa alloys, their future in medical applications may be impeded by the potential negative influences of brittle phases on ductility and fatigue performance.
引用
收藏
页码:249 / 257
页数:9
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