Abstract
In this study, we investigated the shape memory behavior and phase transformations of solution-treated Fe43.61Mn34.74Al13.38Ni8.27 alloy between room temperature and 1173 K (900 °C). This alloy exhibits the reverse shape memory effect resulting from the phase transformation of α (bcc) → γ (fcc) between 673 K and 1073 K (400 °C and 800 °C) in addition to the shape memory effect resulting from the martensitic reverse transformation of γ′ (fcc) → α (bcc) below 673 K (400 °C). There is a high density of hairpin-shaped dislocations in the α phase undergoing the martensitic reverse transformation of γ′ → α. The lath γ phase, which preferentially nucleates and grows in the reversed α phase, has the same crystal orientation with the reverse-transformed γ′ martensite. However, the vermiculate γ phase, which is precipitated in the α phase between lath γ phase, has different crystal orientations. The lath γ phase is beneficial to attaining better reverse shape memory effect than the vermiculate γ phase.
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This work was supported by the financial support of the National Natural Science Foundation of China (Nos. 51271128 and 51401136), the Applied Basic Research Projects of Sichuan Province (No. 2016JY0061), and the International Visiting Program for Excellent Young Scholars of SCU.
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Manuscript submitted January 9, 2016.
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Peng, H., Huang, P., Zhou, T. et al. Reverse Shape Memory Effect Related to α → γ Transformation in a Fe-Mn-Al-Ni Shape Memory Alloy. Metall Mater Trans A 48, 2132–2139 (2017). https://doi.org/10.1007/s11661-017-3991-3
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DOI: https://doi.org/10.1007/s11661-017-3991-3