Journal
JOM
Volume 69, Issue 11, Pages 2078-2083Publisher
SPRINGER
DOI: 10.1007/s11837-017-2381-z
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Funding
- National Natural Science Foundation of China (NSFC) [51271001]
- NSFC [U1560105]
- University Natural Science Research Project of Anhui Province of China [KJ2014A029]
- State Key Laboratory of Tribology [SKLTKF14B02]
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Effects of heat treatment on borides precipitation and mechanical properties of arc-melted and laser-cladded CoCrNiFeAl1.8Cu0.7B0.3Si0.1 high-entropy alloys were comparatively studied. The arc-melted alloy contains lots of long strip borides distributed in the body-centered cubic phase, with a hardness about 643 HV0.5. Laser-cladding can effectively inhibit the boride precipitation and the laser-cladded alloy is mainly composed of a simple bcc solid solution, with a high hardness about 769 HV0.5, indicating the strengthening effect by interstitial boron atoms is greater than the strengthening by borides precipitation. Heat treatments between 800 degrees C and 1200 degrees C can simultaneously improve the hardness and fracture toughness of arc-melted alloys, owing to the boride spheroidization, dissolution, re-precipitation, and hence the increased boron solubility and nano-precipitation in the bcc solid solution. By contrast, the hardness of laser-cladded alloys reduce after heat treatments in the same temperature range, due to the decreased boron solubility in the matrix.
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