Thermo-mechanical response of single-phase face-centered-cubic AlxCoCrFeNi high-entropy alloy microcrystals

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The response of [100]-oriented single-crystal face-centered-cubic Al-0.1 CoCrFeNi and Al0.3CoCrFeNi high-entropy alloy (HEA) microcrystals tested from 293 to 573 K by means of in situ microcompression is reported. At all temperatures, plasticity is governed by dislocation slip with significant strain hardening and intermittent strain bursts observed. A model, which is in good agreement with experimental measurements, is also developed to predict the effects of Al concentration, temperature, and crystal size on the strength of HEAs. The model interestingly predicts a softening response with an increase in Al concentration when the crystal size is +/- 0.1 mu m. Finally, this model can guide the development of advanced HEAs for small-scale applications. [GRAPHICS IMPACT STATEMENT In situ scanning electron microscopy (5EM) experiments are performed to quantify the thermomechanical response of AIxCoCrFeNi microcrystals. A physics-based model is also proposed to predict the strength of high-entropy alloys as a function of crystal size, temperature, and Al concentration.
Publisher
TAYLOR & FRANCIS INC
Issue Date
2018-03
Language
English
Article Type
Article
Citation

MATERIALS RESEARCH LETTERS, v.6, no.5, pp.300 - 306

ISSN
2166-3831
DOI
10.1080/21663831.2018.1446468
URI
http://hdl.handle.net/10203/242483
Appears in Collection
ME-Journal Papers(저널논문)
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