TY - JOUR
T1 - In-situ real time observation of martensite transformation in duplex fcc+hcp cobalt based entropic alloys
AU - Wang, Wei
AU - Mu, Wangzhong
AU - Hou, Ziyong
AU - Sukenaga, Sohei
AU - Shibata, Hiroyuki
AU - Larsson, Henrik
AU - Mao, Huahai
N1 - Funding Information:
WM would like to acknowledge the Swedish Foundation for International Cooperation in Research and Higher Education (STINT, Project No. PT2017-7330 ) for supporting his research activity in both Tohoku University (Japan) and KTH (Sweden). WM and ZH acknowledge the financial support from Jernkontoret (The Swedish Steel Producers’ Association), Stiftelsen Axel Ax:son Johnsons forskningsfond and Prytziska fonden nr 2. WW would like to thank the Key R&D Science and Technology Development Project of Jilin Provincial Science and Technology Department (Grant No. 20200401106GX ) for the financial support. HS, SS and WM would like to acknowledge Japan Society for the Promotion of Science (JSPS, project number PE18054 ).
PY - 2020/12
Y1 - 2020/12
N2 - 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.
AB - 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.
KW - Co-based entropic alloys
KW - Confocal laser scanning microscope
KW - In-situ observation
KW - Martensite transformation
KW - Materials design
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U2 - 10.1016/j.mtla.2020.100928
DO - 10.1016/j.mtla.2020.100928
M3 - Article
AN - SCOPUS:85094097271
VL - 14
JO - Materialia
JF - Materialia
SN - 2589-1529
M1 - 100928
ER -