14% recoverable strain in Ni52.87Mn23.82Ga23.32 microwires. (1st February 2017)

• Record Type: Journal Article
• Authors: Ding, Zhiyi; Zhu, Jie; Zhang, Xinzhen; Liu, Dexing; Qi, Qingli; Zhang, Yong; Cong, Daoyong
• Is Part Of: Journal of physics. Volume 50:Number 9(2017)
• Publication Date: 2017-02-01
• Subjects: superelastic strain -- microwires -- shape memory alloys -- martensitic phase transformation; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/aa5609
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Shape memory alloys exhibit superelasticity and shape memory properties by virtue of a reversible phase transformation between austenite and martensite. Here, 14% recoverable strain is reported in a Heusler-type Ni52.87 Mn23.82 Ga23.32 microwire, fabricated by rapid solidification via the Taylor method, with a diameter of 110 µ m. The microwire exhibits superelastic strain of ~11%, very low Young's modulus of ~5.5 GPa, critical stress of ~110 MPa and mechanical stability during cyclic tensile test. We attribute this enhanced ductility and large superelasticity to the stress-induced martensitic phase transformation. The energy conversion and the structure of martensitic phase induced by stress are also discussed.