Effect of aging time on shape memory properties of sputtered Ni-rich Ni2MnGa alloy films

被引：17

作者：

Suzuki, M ^{[1
]}

Ohtsuka, M ^{[1
]}

Matsumoto, M ^{[1
]}

Murakami, Y ^{[1
]}

Shindo, D ^{[1
]}

Itagaki, K ^{[1
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

来源：

MATERIALS TRANSACTIONS | 2002年 / 43卷 / 05期

关键词：

nickel-manganese-gallium; shape memory alloy; sputter-deposition; martensitic transformation; constraint-aging; two-way shape memory effect; precipitate;

D O I：

10.2320/matertrans.43.861

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ni2MnGa alloy is an intelligent material with ferromagnetic and shape memory properties. The application of the alloy films to microactuators has been proposed. The Ni-rich Ni2MnGa alloy films with a thickness of nearly 5 mum were deposited on Al2O3 substrates by a radio-frequency magnetron sputtering apparatus using a Ni52Mn24Ga24 target. They were heat-treated at 1073 K for 36 ks for homogenization and ordering. The martensitic transformation temperatures of the heat-treated films were higher than room temperature. To investigate the effect of aging time on shape memory properties, the heat-treated films were aged at 673 K for various times between 0.9 and 57.6 ks in a constrained condition. The constraint-aged films showed the two-way shape memory effect by thermal cycling. Fine precipitates with a crystal structure of L1(2) were observed in the constraint-films aged for a long period. As for their two-way shape memory properties, a range of transformation temperature narrowed and the amount of macroscopic shape change increased with increasing aging time.

引用

页码：861 / 866

页数：6

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