In-situ real time observation of martensite transformation in duplex fcc+hcp cobalt based entropic alloys

Wei Wang, Wangzhong Mu, Ziyong Hou, Sohei Sukenaga, Hiroyuki Shibata, Henrik Larsson, Huahai Mao

Research output: Contribution to journalArticlepeer-review

Abstract

Athermal martensite transformation in duplex fcc+hcp Co-based entropic alloys during continuous cooling was investigated in-situ. The real time observation was carried out using high temperature confocal laser scanning microscopy (HT-CLSM). This technique enables the detection of the athermal fcc to hcp transformation in entropic alloys, which is not sensitively detected by conventional thermomechanical methods e.g. dilatometer. The martensite fraction increases with increasing martensite starting temperature, and vice versa. Meanwhile, the martensite starting temperature decreases with the increasing grain size. In addition, the morphology and nucleation sites for martensite formation is discussed. This is the first time the that HT-CLSM technique is utilized in the field of entropic alloys. This in-situ observation technique coupled with thermodynamic calculations may help in the design of entropic alloys through the tailoring of the desired microstructure.

Original languageEnglish
Article number100928
JournalMaterialia
Volume14
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Co-based entropic alloys
  • Confocal laser scanning microscope
  • In-situ observation
  • Martensite transformation
  • Materials design

ASJC Scopus subject areas

  • Materials Science(all)

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