Microstructure and Mechanical Properties of Cu Matrix Composites Reinforced by TiB2/TiN Ceramic Reinforcements
来源期刊：Acta Metallurgica Sinica2020年第12期
论文作者：Jinwei Yin Peilong Zhou Hanqin Liang Dongxu Yao Yongfeng Xia Kaihui Zuo YuPing Zeng
摘 要：Cu matrix composites reinforced by TiB2/TiN ceramic reinforcements（Cu/TBN composites） were prepared by hot pressing method. Prior to the hot pressing, Cu/TiB2/TiN composite powders（CTBN powders）, which were used as the starting materials of Cu/TBN composites, were fabricated by self-propagating high-temperature synthesis method. The CTBN particles were found to be in a special core–shell structure with a Cu–Ti alloy core and a TiB2/TiN ceramic shell. The test results presented obvious improvements in mechanical properties. The highest ultimate tensile strength reached up to 297 MPa, 77 MPa higher than that of Cu. And the highest hardness reached up to 70.7 HRF, 15.7 HRF higher than that of Cu. A comparative study indicated that the core–shell structured particles could bring about more obvious strengthening eff ect than the traditional irregularly shaped particles, which was due to the improved Cu/ceramics interfacial bonding, the linkage strengthening effect of both TiB2 and TiN, and higher load bearing ability of the core–shell structured reinforcements.
Jinwei Yin1，Peilong Zhou1,2，Hanqin Liang1，Dongxu Yao1，Yongfeng Xia1，Kaihui Zuo1，YuPing Zeng1
1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics ,Chinese Academy of Sciences2. Center of Materials Science and Optoelectronics Engineering ,University of Chinese Academy of Sciences
摘 要：Cu matrix composites reinforced by TiB2/TiN ceramic reinforcements（Cu/TBN composites） were prepared by hot pressing method. Prior to the hot pressing, Cu/TiB2/TiN composite powders（CTBN powders）, which were used as the starting materials of Cu/TBN composites, were fabricated by self-propagating high-temperature synthesis method. The CTBN particles were found to be in a special core–shell structure with a Cu–Ti alloy core and a TiB2/TiN ceramic shell. The test results presented obvious improvements in mechanical properties. The highest ultimate tensile strength reached up to 297 MPa, 77 MPa higher than that of Cu. And the highest hardness reached up to 70.7 HRF, 15.7 HRF higher than that of Cu. A comparative study indicated that the core–shell structured particles could bring about more obvious strengthening eff ect than the traditional irregularly shaped particles, which was due to the improved Cu/ceramics interfacial bonding, the linkage strengthening effect of both TiB2 and TiN, and higher load bearing ability of the core–shell structured reinforcements.
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