Effect of the Addition of Gd on Ni₅₃Mn₂₂Co₆Ga₁₉ High-Temperature Shape Memory Alloy

Abstract:

The rare earth element Gd is added to Ni53Mn22Co6Ga19 high-temperature shape memory alloy to refine the grain size and adjust the distribution of γ phase, and their microstructure, martensitic transformation behaviors, mechanical and shape memory properties were investigated. The results show that the grain size is obviously decreased and the γ phase tends to segregate at grain boundaries with increasing Gd content. Small amounts of Gd-rich phase were formed with 0.1 at.% Gd addition. The martensitic transformation temperature abruptly increases with 0.1 at.% Gd addition, then almost keeps constant with further increasing Gd content. The addition of 0.1 at.% Gd is proved to be beneficial to both tensile stress and strain before fracture, but negative to the shape-memory effect.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 2095-2098
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.2095
• Online since: June 2010
• Authors: Yun Qing Ma, Shui Yuan Yang, San Li Lai, Shi Wen Tian, Cui Ping Wang, Xing Jun Liu
• Keywords: Ductility, High-Temperature Shape-Memory Effect, Ni-Mn-Ga, Tensile

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