Effect of Al2O3 content and swaging on microstructure and mechanical properties of Al2O3/W alloys |
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| Affiliation: | 1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, China;2. Henan Key Laboratory for High-temperature Structural and Functional Materials, Henan University of Science and Technology, Luoyang, Henan, 471003, China;3. Department of Materials Science and Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269-3136, USA |
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| Abstract: | Al2O3-reinfored tungsten alloys were fabricated by powder metallurgy method and hot swaging technology. The investigation was made on the microstructure, relative density, nano-hardness and fracture toughness (KIC) of the sintered and swaged Al2O3/W alloys. The swaging process and addition of Al2O3 are beneficial to comprehensive properties of the sintered and swaged alloys. After swaging, the Al2O3/W alloys can achieve the full density. According to the nano-indentation test and three-point bend test, the swaged W-0.25 wt% Al2O3 alloy possesses the highest hardness of 7.02 GPa, the greatest modulus of 435.09 GPa and the maximum fracture toughness of 21 MPa·m1/2. The observation of fracture morphology shows that the recrystallization behavior and grain growth occur above 1400 °C in the swaged pure W alloy, which leads to recrystallization brittleness. At the same time, the microstructure of the swaged W-0.25 wt% Al2O3 alloy does not change apparently. |
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