Elastocaloric effect using lattice softening – possibility as new refrigerant materials

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289230
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Osaka University
• Principal Investigator: Fukuda Takashi 大阪大学, 工学(系)研究科(研究院), 准教授 (50228912)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: マルテンサイト変態 / 格子軟化 / 磁気冷凍 / 冷凍材料

Outline of Final Research Achievements

Stress-induced martensitic transformation and its reverse transformation are associated with a significant latent heat, which caused temperature change of the specimen. This effect has attracted considerable attention because it can be used as a new refrigeration system. However, the use of typical shape memory alloys as refrigerant material faces two important problems which should be solved. One is hysteresis loss, and the other is deterioration of the refrigerant properties by repetition. In this study, we demonstrated that these problems can be solved by using a weak-first order martensitic transformation in an Fe-Pd alloy. In this alloy we exploit temperature dependence of elastic strain of this alloy to obtain a significant elastocaloric effect instead of using latent heat of first order transformation.

Free Research Field

材料組織学，金属物性