Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 210, Issue -, Pages 207-212Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2017.06.023
Keywords
Eutectic high entropy alloy; Low temperature tensile test; Nanoindentation; TEM
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Funding
- Elements Strategy Initiative for Structural Materials (ESISM) in Kyoto University
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [15H05767]
- DST, India [SB/S3/ME-47/2013]
- Areas of Advance Materials Science at Chalmers University of Technology
- Swedish Research Council [2015-04087]
- People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7) under REA [608743]
- Swedish Research Council [2015-04087] Funding Source: Swedish Research Council
- Grants-in-Aid for Scientific Research [15H05767] Funding Source: KAKEN
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The effect of low temperature on tensile properties of a AlCoCrFeNi2.1 eutectic high entropy alloy (EHEA) was investigated in the present work. Transmission electron microscopy (TEM) showed that the initial as-cast microstructure consisted of B2 (ordered body centered cubic structure) and L1(2) (ordered face centered cubic structure) phases. Upon tensile testing at temperatures ranging from room temperature (RT) to -196 degrees C (77 K), the L1(2) phase became disordered, changing to a simple FCC (face centered cubic) crystal structure whereas the B2 phase maintained an ordered structure. An increase over 300 MPa was observed in the ultimate tensile strength (ours) of the -196 degrees C tensile tested sample compared to the room temperature tensile tested sample, while keeping almost similar amount of total elongation. TEM results indicated an increase in the dislocation activity in the FCC phase as well as B2 phase in the -196 degrees C tensile tested sample compared to the sample deformed at room temperature. (C) 2017 Elsevier B.V. All rights reserved.
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