Creep behavior of NiTi shape memory alloys and the effect of pre-creep on the martensitic phase transformation

被引：10

作者：

Eggeler, GF ^{[1
]}

Neuking, K ^{[1
]}

Dlouhy, A ^{[1
]}

Kobus, E ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Inst Werkstoffe, DE-44780 Bochum, Germany

来源：

SHAPE MEMORY MATERIALS | 2000年 / 327-3卷

关键词：

NiTi; creep; martensitic transformation; effect of pre-creep; R-phase formation;

D O I：

10.4028/www.scientific.net/MSF.327-328.183

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The paper reports creep data of a Ni-rich NiTi-alloy at stresses and temperatures in the range of 500 degrees C and 150 MPa. The apparent activation energy for creep and the creep stress exponent were found to be 421 kJ/mole and 5. Tempering and pre-creep result in a 20 degrees C increase of phase transformation temperatures (PTTs). The effect of an additional plastic deformation (as compared to a stress free aging treatment) is that PTT-peaks broaden and overlap on cooling and broaden on heating. This can only be rationalized on the basis of a difference in microstructures between the tempered and pre-crept materials.

引用

页码：183 / 186

页数：4