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Néel transition and γ⇌ɛ transformation in polycrystalline Fe-Mn-Si shape memory alloys

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Abstract

Silicon lowers the Néel temperature,T N, and enhances the paramagnetic characteristic of γ-Fe-Mn alloy, which results in a reduction of the stability of austenite and in the anomalous increase of electrical resistivity, ϱ, belowT N becoming stronger, i.e. the anomalous ϱ belowT N increases rapidly with increasing silicon content. The γ⇌ɛ transformation occurs during cooling and heating, but γ→ɛ martensitic transformation is suppressed below about 240 K, probably due to the ɛ phase transfer from paramagnetic to antiferromagnetic state. The ϱ (T) changes steeply, accompanying the Néel transition and the γ⇌ε transformation. Silicon increases the electrical resistivity and the magnetic susceptibility, χ, of γ-Fe-Mn alloy, and the ɛ phase obviously increases the electrical resistivity of Fe-Mn-Si alloys. The relation between the Néel transition, γ→ɛ martensitic transformation and shape memory effect (SME), are discussed.

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  1. Yu Manping

    Present address: Dalian Acid-proof Pump Plant, 116022, Dalian, People's Republic of China

Authors and Affiliations

  1. Department of Materials Science and Engineering, Dalian Railway Institute, 116028, Dalian, People's Republic of China

    Qin Zuoxiang, Yu Manping & Zhang Yansheng

Authors
  1. Qin Zuoxiang
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  2. Yu Manping
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  3. Zhang Yansheng
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Zuoxiang, Q., Manping, Y. & Yansheng, Z. Néel transition and γ⇌ɛ transformation in polycrystalline Fe-Mn-Si shape memory alloys. J Mater Sci 31, 2311–2315 (1996). https://doi.org/10.1007/BF01152939

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  • DOI: https://doi.org/10.1007/BF01152939

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