Inverse elastocaloric effect in a Ti-Ni alloy containing aligned coherent particles of Ti3Ni4. (November 2016)

• Record Type: Journal Article
• Authors: Xiao, Fei; Fukuda, Takashi; Kakeshita, Tomoyuki
• Is Part Of: Scripta materialia. Volume 124(2016)
• Page Start: 133
• Page End: 137
• Publication Date: 2016-11
• Subjects: Mechanical properties -- Shape memory alloys -- Martensitic transformation -- Stress-induced reverse transformation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.07.016
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We have detected an inverse elastocaloric effect in a Ti-51Ni (at%) alloy which contains aligned coherent particles of Ti3 Ni4 formed by aging under tensile stress. In this alloy, the temperature of the specimen decreases when stress is applied due to a stress-induced reverse martensitic transformation (from the R-phase to the B2-phase) The temperature decrease caused by this effect is about 1.1 K at 300 K. The internal stress field around the Ti3 Ni4 precipitate is responsible for this effect. A further increase in the tensile stress causes a temperature rise due to a conventional elastocaloric effect. Graphical abstract: