Effect of Heat Treatment on Borides Precipitation and Mechanical Properties of CoCrFeNiAl1.8Cu0.7B0.3Si0.1 High-Entropy Alloy Prepared by Arc-Melting and Laser-Cladding
| Autor: | J. L. Zhang, Sheng Guo, W. H. Li, Yi Zhu He, H. Tang, Hui Zhang |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Precipitation (chemistry) Alloy Metallurgy General Engineering chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences chemistry.chemical_compound chemistry Boride Phase (matter) 0103 physical sciences engineering General Materials Science Solubility 0210 nano-technology Boron Dissolution Solid solution |
| Zdroj: | JOM. 69:2078-2083 |
| ISSN: | 1543-1851 1047-4838 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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