Conventional and inverse elastocaloric effect in Ni-Fe-Ga and Ni-Mn-Sn ribbons

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• 作者：P. Á ; lvarez-Alonso^a ; ; C.O. Aguilar-Ortiz^b ; E. Villa^c ; A. Nespoli^c ; H. Flores-Zú ; ñ ; iga^b ; V.A. Chernenko^d ; ^e
• 关键词：Shape memory alloys ; Martensitic transformation ; Elastocaloric effect
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：128
• 期：Complete
• 页码：36-40
• 全文大小：888 K

文摘

Magnetic shape memory Ni₅₅Fe₁₆Ga₂₉ and Ni₅₀Mn₄₀Sn₁₀ melt spun ribbons have been characterized by thermomechanical and mechanical analysis. Martensitic transformation temperatures show an abnormal tendency to decline under low stress followed by a conventional increase above a threshold stress, related to the internal compressive stress generated in the fabrication process. The shrinkage of the samples during the forward martensitic transformation gives rise to an inverse elastocaloric effect. A conventional contribution in the total elastocaloric response is observed when applied stress overcomes the internal one. The conventional and inverse elastocaloric effects are attributed to the stress-induced forward and reverse martensitic transformation, respectively.