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Thermodynamic Explanation for the Large Difference in Improving Shape Memory Effect of Fe–Mn Alloys by Co and Si Addition
Author(s) -
Chen Jie,
Sun Jiangwei,
Yang Qin,
Peng Huabei,
Wang Shanling,
Wen Yuhua
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500645
Subject(s) - materials science , shape memory alloy , martensite , microstructure , alloy , metallurgy , deformation (meteorology) , diffusionless transformation , stress (linguistics) , composite material , linguistics , philosophy
The authors investigate the shape memory effect (SME) and microstructure evolution of the Fe–25Mn, Fe–25Mn–6Co, and Fe–25Mn–6Si alloys before and after deformation at room temperature (RT) through ex situ optical observation. After deformation, the stress‐induced reverse transformation of thermal ϵ martensite, an unrecovered deformation mode, can be easily observed in the Fe–25Mn and Fe–25Mn–6Co alloys, but it can be hardly observed in the Fe–25Mn–6Si alloy. The lower values of chemical driving force for ϵ → γ transformation at RT lead to the occurrence of the stress‐induced reverse transformation of thermal ϵ martensite and the poorer SME in the Fe–Mn and Fe–Mn–Co alloys than in the Fe–Mn–Si alloy.