Giant elastic response and ultra-stable elastocaloric effect in tweed textured Fe-Pd single crystals. (15th January 2022)

• Record Type: Journal Article
• Authors: Xiao, Fei; Bucsek, Ashley; Jin, Xuejun; Porta, Marcel; Planes, Antoni
• Is Part Of: Acta materialia. Volume 223(2022)
• Publication Date: 2022-01-15
• Subjects: Martensitic transformation -- Shape memory -- Iron-palladium -- Tweed -- Elastic behavior; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2021.117486
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: The limit of elastic deformation in conventional metals and alloys is usually within 0.1%. When deformed further, these materials show plastic deformation effects, which are a consequence of dislocation movements. Here, we report that a much larger elastic-like strain of more than 4% can be achieved in a tweed textured Fe-Pd single crystal under a compressive stress of 300 MPa. We show that this giant elastic response gives rise to significant and homogenous elastocaloric effect (∼4.1 K) that can sustain 10 6 or even more mechanical cycles without degradation. The large and stable elastic-like strain in Fe-Pd originates from the continuous and reversible structural change associated with the tweed texture under stress as confirmed by the in-situ high energy X-ray diffraction tests. Phase field simulation also confirms this giant elastic response and ultra-stable elastocaloric effect under a compressive stress in the Fe-Pd alloy. Graphical abstract: Image, graphical abstract