Stable elastocaloric effect under tensile stress of iron-palladium alloy and its in situ X-ray observation

详细信息    查看全文

• 作者：Fei Xiao^a ; ^d ; Xiao Liang^a ; Xuejun Jin^b ; ^{jin@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhihua Nie^c ; ^{znie@bit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Tomoyuki Kakeshita^d ; Takashi Fukuda^d ; ^{fukuda@mat.eng.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Elastocaloric effect ; Elastic behavior ; Martensitic phase transformation ; Shape memory alloy
• 刊名：Acta Materialia
• 出版年：2016
• 出版时间：1 October 2016
• 年：2016
• 卷：118
• 期：Complete
• 页码：88-94
• 全文大小：1388 K

文摘

The elastocaloric effect under tensile stress along the [001] direction has been investigated in an Fe-31.2Pd (at.%) alloy, which exhibits a weak first-order martensitic transformation at 230 K from a face-centered cubic structure to a face-centered tetragonal (c/a < 1) structure. A stable temperature variation of 1.9 K was observed at room temperature (∼288 K) up to 10000 cycles of sinusoidal tensile stress (200 MPa). The stress-strain curve shows a macroscopic strain of 1.2% under 200 MPa with a negligible stress hysteresis. The macroscopic strain coincides with the lattice strain obtained by in situ X-ray diffraction. A significant extension of the 200 reflection, perpendicular to the tensile direction, was observed. This peak extension could be the way the specimen realizes a high elastic strain, even under tensile stress.