Precipitations in a Ni Ti-Nb alloy during annealing

被引：0

作者：

Jia, D ^{[1
]}

Liu, WX ^{[1
]}

Dong, ZZ ^{[1
]}

Yu, SJ ^{[1
]}

Zhang, Q ^{[1
]}

Wang, DF ^{[1
]}

Liu, DZ ^{[1
]}

机构：

[1] Tianjin Univ, Coll Mat Sci & Engn, Shape Memory Mat Engn & Res Ctr, Tianjin 300072, Peoples R China

来源：

PROGRESS IN NATURAL SCIENCE | 1999年 / 9卷 / 03期

关键词：

Ni-Ti-Nb alloy; precipitates; annealing; (Ni; Nb)(3); Ti;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The methods of XRD, TEM and energy dispersive X-ray (EDX) were used to investigate the precipitation process in Ni47Ti44Nb9 specimens annealed at 850 degrees C. A diffusional transformation took place when the alloy was subjected to a long time heat treatment, most of beta-Nb particles disappeared and a new precipitate (Ni, Nb)(3)Ti with an h. c. p. structure (a=0.512 2 nm, c=0.837 6 nm, and c/a= 1.63) was found, which was similar to Ni3Ti in structure. The upper critical precipitation temperature of the alloy was above 950 degrees C, it meant that the presence of niobium inhibited the occurance of the precipitation. In addition, the orientation relationship between the remaining beta-Nb precipitate and matrix was observed: [111](beta-Nb)//[111](M), (110)(beta-Nb)//(110)(M).

引用

页码：216 / 222

页数：7

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