Elastocaloric effect in Ti-Ni shape-memory wires associated with the B2 ⇆ B19' and B2 ⇆ R structural transitions

被引：60

作者：

Soto-Parra, Daniel ^{[1
,2
]}

Vives, Eduard ^{[1
]}

Manosa, Lluis ^{[1
]}

Matutes-Aquino, J. A. ^{[2
]}

Flores-Zuniga, Horacio ^{[3
]}

Planes, Antoni ^{[1
]}

机构：

[1] Univ Barcelona, Fac Fis, Dept Estruct & Constituents Mat, Diagonal 647, E-08028 Barcelona, Catalonia, Spain

[2] Ctr Invest Mat Avanzados, SC Miguel De Cervantes 120,Complejo Ind Chihuahua, Chihuahua 31109, Mexico

[3] Inst Potosino Invest Cient & Tecnol, Camino Presa San Jose 2005,Col Lomas 4a, San Luis Potosi 78216, Mexico

来源：

APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 07期

关键词：

ALLOYS;

D O I：

10.1063/1.4942009

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have studied the elastocaloric properties of Ti-Ni shape-memory wires subjected to specific heat treatments to decouple the B2 <-> R transition from the B2 <-> B19' one. The entropy values at moderate stresses (similar to 170 MPa) for the B2 <-> B19' transition are remarkably high (in the range 60-80 J/kg K). However, in spite of the B2 <-> R transition exhibits significantly lower entropy changes (similar to 12 J/kg K), the much smaller hysteresis of this transition gives rise to a larger reversible elastocaloric effect for low applied stresses. Therefore, the reversible elastocaloric strength associated with the B2 <-> R is larger than the elastocaloric strength associated with the B2 <-> B19' transition. (C) 2016 AIP Publishing LLC.

引用

页数：5

共 20 条

[1] Hysteresis in a system driven by either generalized force or displacement variables:: Martensitic phase transition in single-crystalline Cu-Zn-Al [J].