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- Title
Effect of Heat Treatment on Borides Precipitation and Mechanical Properties of CoCrFeNiAlCuBSi High-Entropy Alloy Prepared by Arc-Melting and Laser-Cladding.
- Authors
Zhang, H.; Tang, H.; He, Y.; Zhang, J.; Li, W.; Guo, S.
- Abstract
Effects of heat treatment on borides precipitation and mechanical properties of arc-melted and laser-cladded CoCrNiFeAlCuBSi 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 HV. 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 HV, indicating the strengthening effect by interstitial boron atoms is greater than the strengthening by borides precipitation. Heat treatments between 800°C and 1200°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.
- Subjects
CHROMIUM-iron-nickel alloys; IRON-nickel-copper alloys; IRON-nickel-cobalt alloys; HEAT treatment of metals; BORIDES; PRECIPITATION (Chemistry); MECHANICAL properties of metals; MELTING
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2017, Vol 69, Issue 11, p2078
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-017-2381-z