π-phase and χ-phase : new precipitates in biomedical Co-Cr-Mo alloys
π-phase and χ-phase : new precipitates in biomedical Co-Cr-Mo alloys
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π相和χ相：生物医学Co-Cr-Mo合金中的新析出物
DOI：
10.1007/978-4-431-54070-0_12
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S.Mineta (T.Narushima)
中科院分区：
文献类型：
--
作者：
Y.Tominaga;T.Kubo;K.Yasuda;K.Kato;K.Hosoya;S.Mineta (T.Narushima)
综述了ASTM F75和F799 Co-Cr-Mo合金中析出相的相组成，重点介绍了新的π相和χ相析出相。Co-Cr-Mo-C系合金在1，548 ~ 1，623 K发生部分熔化时出现π相碳化物。Si在π相沉淀物中略微富集，并且氮取代了π相的八面体位置中的碳。认为部分熔化区的形成和稳定性以及π相的转变参与了ASTM F 75和F 799合金中析出相的最终构成。在铸态和热处理态Co-Cr-Mo合金中发现了一种含中等碳量和Si的χ相。X相沉淀物是金属间化合物。形成X相的条件受热处理温度和化学组成的限制。
The phases of precipitates in ASTM F 75 and F 799 Co–Cr–Mo alloys are reviewed with a focus on new precipitates of the π- and χ-phases. The π-phase carbide was observed at temperatures of 1,548–1,623 K where partial melting in Co–Cr–Mo–C system alloys occurred. Si was slightly enriched in the π-phase precipitate and nitrogen substituted carbon in the octahedral sites of the π-phase. It is suggested that the formation and stability in the partial melting region and the transformation of the π-phase take part in the final constitution of the precipitates in ASTM F 75 and F 799 alloys. A χ-phase has been detected in the as-cast and heat-treated Co–Cr–Mo alloy with a midlevel carbon content and the addition of Si. The χ-phase precipitate is an intermetallic compound. The conditions under which the χ-phase is formed are limited by the heat-treatment temperature and chemical composition.