Abstract
Nb-Si base alloys have attracted considerable attentions as the potential high temperature structural materials working in the service temperature range of 1200~1400 °C because of their high melting points (> 1750 °C), moderate densities (6.6~7.2 g/cm) and excellent high temperature strength. However, the mismatching between room temperature fracture toughness and high temperature strength has limited their practical applications. Directional solidification (DS) and alloying have been proved to be the effective methods to overcome this critical issue. The DS processes used to prepare Nb-Si base alloys included Czochralski directional solidification in a copper crucible, electron beam directional solidification, optical floating zone melting, integrally directional solidification and electromagnetic cold crucible directional solidification (ECCDS). The previous studies focused on the effect of process parameters on microstructure and mechanical properties in the steadystate growth region (SS*国家自然科学基金项目51171053和航空科学基金项目20135377020资助 收到初稿日期: 2013-12-24,收到修改稿日期: 2014-05-15 作者简介:燕云程,男, 1983年生,博士生 DOI: 10.11900/0412.1961.2013.00835 第1039-1045页 pp.1039-1045
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