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Powder Metallurgy Synthesis of Heusler Alloys: Effects of Process Parameters

School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
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Materials 2019, 12(10), 1596; https://doi.org/10.3390/ma12101596
Received: 22 April 2019 / Revised: 11 May 2019 / Accepted: 13 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Advances in Multiferroics)
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Abstract

Ni45Co5Mn40Sn10 Heusler alloy was fabricated with elemental powders, using a powder processing route of press and sinter, in place of vacuum induction melting or arc melting route. The effects of process parameters, such as compaction load, sintering time, and temperature, on the transformation characteristics and microstructures of the alloy were investigated. While the effect of compaction pressure was not significant, those of sintering time and temperature are important in causing or annulling martensitic transformation, which is characteristic of Heusler alloys. The processing condition of 1050 °C/24 h was identified to be favorable in producing ferromagnetic Heusler alloy. Longer durations of sintering resulted in an increased γ-phase fraction, which acts as an impediment to the structural transformation. View Full-Text
Keywords: Heusler alloy; powder processing; process parameters; microstructure; martensite Heusler alloy; powder processing; process parameters; microstructure; martensite
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Ahamed, R.; Ghomashchi, R.; Xie, Z.; Chen, L. Powder Metallurgy Synthesis of Heusler Alloys: Effects of Process Parameters. Materials 2019, 12, 1596.

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