Synthesis and sintering of Fe-32Mn-6Si shape memory alloys prepared by mechanical alloying

  • Ali Shamsipoor 1
  • Babak Mousavi 1
  • Mohammad Sadegh Shakeri 2
  • 1 Materials and Energy Research Center (MERC), P.O. Box 31779-83634, Karaj, Iran
  • 2 Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland

Abstract

Fe-32Mn-6Si alloy was produced using the mechanical alloying (MA) process of high purity powders under an inert argon gas atmosphere. The aim of this investigation is the in-depth study of the microstructure and phase transformation during the milling-sintering process of Fe-32Mn-6Si shape memory alloys. During the milling process, a significant amount of amorphous phase was created as well the crystalline martensite and austenite phases. The amorphous phase was increased by milling time enhancement and then it was decreased due to the mechano-crystalization phenomenon. It was detected that the microhardness of the alloyed powder directly depends on the amount of the amorphous phase. Furthermore, the particle size of as-milled powder firstly decreased and then increased, when the amorphous phase cojoined gradually during the milling process the transformation of martensite into austenite. The lattice strain was increased considerably during the milling process which was a reason for martensite phase creation resulting in the high shape memory properties. The amount of pre-strain for Fe-32Mn-6Si alloy was calculated to be 3.3%. Furthermore, the optimum sintering temperature was approved to be 950 °C by reduction of the percentage of pores and suitable densification.

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Keywords: Shape memory alloys, Mechanical alloying, Sintering, Phase transformation, Martensite

References

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Synthesis and sintering of Fe-32Mn-6Si shape memory alloys prepared by mechanical alloying
Submitted
2022-01-03
Available online
2022-02-07
How to Cite
Shamsipoor, A., Mousavi, B., & Shakeri, M. S. (2022). Synthesis and sintering of Fe-32Mn-6Si shape memory alloys prepared by mechanical alloying. Synthesis and Sintering, 2(1), 1-8. https://doi.org/10.53063/synsint.2022.2185