Experimental Investigations of the High-Temperature Phase Relationship and Ordering Transition in Ni-Mn-Ga Ternary System

Abstract:

The phase equilibria at 900 °C and B2/L21 order-disorder transition in the Ni-Mn-Ga ternary system were investigated by analyzing the equilibrated alloys and diffusion couples using a combination of techniques. It was confirmed that a bcc single phase region exists in a wide composition range at 900 °C, and the critical temperatures of B2/L21 order-disorder transition were determined in Ni-50 at.% section, which exhibits a maximal ordering transition temperature of 796 at Mn content of 25 at.%. The obtained results will be helpful for the preparation and annealing of Ni-Mn-Ga alloys in the specific temperature.

• Periodical: Advanced Materials Research (Volumes 148-149)
• Pages: 1695-1700
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.148-149.1695
• Online since: October 2010
• Authors: Yun Qing Ma, Shui Yuan Yang, Ryosuke Kainuma, Kiyohito Ishida, Cui Ping Wang, Xing Jun Liu
• Keywords: Diffusion Couple, Order-Disorder Transition, Phase Equilibria

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