The superior thermal stability and tensile properties of hot rolled W-HfC alloys |
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| Affiliation: | 1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China;2. University of Science and Technology of China, Hefei, Anhui 230026, China;3. School of Physics and Electronic Engineering, University of GuangZhou, GuangZhou, Guangdong 510405, China;1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, 230031 Hefei, China;2. University of Science and Technology of China, 230026 Hefei, China;3. China National R&D Center for Tungsten Technology, Xiamen Tungsten Co. Ltd, 361026 Xiamen, China;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, China;2. Henan Key Laboratory of High-temperature Structural and Functional Materials, Henan University of Science and Technology, Luoyang, Henan 471003, China;3. Henan Province Industrial Technology Research Institute of Resource and Materials, Zhengzhou University, Henan 450001, China |
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| Abstract: | Herein, a W-0.5wt%HfC (WHC05) alloy is fabricated by conventional sintering and multi-step hot-rolling. The high-temperature stability and tensile properties at different temperatures, ranging from room temperature to 600 °C, are studied to demonstrate the influence of HfC addition. The results reveal that the WHC05 alloy has a higher recrystallization temperature (1400 °C–1500 °C) than the previously reported as-rolled pure W (1200 °C) and as-rolled W-0.5wt%ZrC (WZC05 ~ 1300 °C) alloy. Moreover, after recovery and recrystallization (annealing at 1600 °C), the WHC05 alloy maintained a high ultimate tensile strength of ~300 MPa and exhibited a desirable increase in total elongation (>35%), which is ~1.6 times higher than the recrystallized WZC05 at 500 °C. The superior thermal stability and excellent high-temperature mechanical properties can be ascribed to the unique microstructure and uniform dispersion of nano-sized HfC particles in W matrix. The influence of annealing temperature on grain structure, grain orientation and distribution of nano-sized HfC particles has been studied to unveil the possible mechanism of enhanced thermal stability and superior mechanical properties. |
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