期刊
NANOTECHNOLOGY
卷 31, 期 13, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab5d75
关键词
W-Cu-Cr-ZrC composite; nanostructuring; doping; segregation; dispersive nanoparticles; ultrahigh hardness
资金
- National Natural Science Foundation of China [51631002, 51425101, 51701007, 51621003]
Phase separation at nanoscale and highly dispersive nanoparticles were exploited to fabricate a novel type of nanocrystalline W-Cu-Cr-ZrC composite with special hierarchical structure. The microstructures were characterized elaborately and the formation mechanisms of the hierarchical structure were disclosed. It was found that the supersaturated Cr separated from W during sintering and segregated at profuse interfaces. Moreover, Cr can also interact with ZrC nanoparticles dispersed in W matrix, leading to the formation of Zr-Cr-C phase which exerts significant effect on inhibiting coarsening of W grains. On the other side, the dissolution of Cr and W contributes to the formation of Cu nanocrystalline structure. As a result, the prepared W-Cu-Cr-ZrC composite exhibits an ultrahigh hardness of 943HV owing to the synergy of nanocrystalline structure and dispersion strengthening of nanoparticles. The hardness has achieved the highest value among the W-Cu-based composites with the same Cu content reported in literature. This study provided a new strategy for production of high-performance W-Cu-based composites through combination of microstructural design with addition of doping element and nanoparticles.
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