ROLE OF YTTRIUM IN COBALT BASED ALLOY AND CEMENTED CARBIDE
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摘要: 对钴基(CO-WC-RE)合金和YG8R硬质合金进行了X射线衍射、SEM、TEM和EDS的观察和分析。结果表明;稀土的加入对钴相的晶格参数没有影响,但使钴相的粒度显著变小,并使合金中WC相晶粒尺寸的不均匀和分布的不均匀得到明显改善;在Co基(CO-WC-Y)合金中可形成的稀土相有稀土氧化物Y2WO6和稀土金属间化合物Co5Y8和Co2Y。Abstract: Examination and analysis of cobalt-based (Co-WC-RE) alloy and YG8R cemented carbide have been made by X-ray diffraction,SEM,TEM and EDS. The results show that the addition of rare earth element exerts no effects on the lattice parameters of cobalt phase,but enables the particle size of cobalt phase to become obviously smaller and greatly improves the inhomogeneity of grain size and distribution of WC phase in the alloy. The rare earth phases which can be formed in Co-based alloy(CoWC-Y) include Y2WO6 rare earth oxide and Co5Y8 and Co2Y intermetallic compounds.
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Key words:
- rare earth element /
- cemented carbide /
- cobalt-based alloy /
- structure
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