期刊
MATERIALS TRANSACTIONS
卷 54, 期 9, 页码 1540-1548出版社
JAPAN INST METALS
DOI: 10.2320/matertrans.MH201318
关键词
severe plastic deformation (SPD); tungsten carbide; heterogeneous microstructure; ceramics; ultrafine-grained (UFG)
资金
- MEXT, Japan, in Innovative Areas Bulk Nanostructured Metals
- Kyushu University
- Grants-in-Aid for Scientific Research [24540526] Funding Source: KAKEN
This study shows that ultrafine-grained composites of WC-11 mass% Co are successfully consolidated by high-pressure torsion (HPT) followed by sintering at lower sintering temperatures or shorter sintering time than hot isostatic pressing (HIP) and compression and sintering. For the samples processed by HPT and successive sintering, the grain size (similar to 700 nm) is smaller and the hardness (similar to 1700 Hv) is higher when compared to those consolidated by compression and sintering and HIP. A heterogeneous microstructure consisting of nanograins of Co and WC and coarse grains of WC ceramics with high dislocation density, 2 x 10(16)m(-2), is formed during HPT, but the average grain size is slightly increased by subsequent sintering. A W3Co3C carbide forms by sintering, while its fraction increases with increasing the shear strain or with increasing the sintering temperature.
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