摘要
研究了Ti-24Al-HNb—3V—IMo合金在650-750℃不同时间暴露后的热稳定性.结果表明:合金的弯曲强度σ_bb及挠度f随暴露温度的升高及时间的延长而连续下降;在真空相同条件下暴露,σ_bb和f稍有下降其主要原因是合金在空气中暴露后除表面生成TiO_2外,还形成富氧脆性层长期热暴露后其显微组织发生变化,即形成“O”相。
The thermal stability of Ti-24Al-11Nb-3V-1Mo alloy was studied after ex-
posure at 650--750℃ for different time. The bending strength σ_(bb) and flexibility f decreased
with increasing exposure temperature and exposure time in air, while only a little change of
σbb and f was noticed when samples exposed under vacuum in the same condition. This is due
to the formation of a brittle oxygen-enriched layer adjacent to the surface of material, in
addtion to the formation of TiO_2 on the surface after exposure in air. Thermal exposure of al-
loy results in the change of microstructure, i.e., forming the 'O' phase, which is not the ma-
jor factor causing the degradation of mechnical properties.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第10期A451-A455,共5页
Acta Metallurgica Sinica
基金
中国高技术新材料专家委员会资助
关键词
钛合金
热稳定性
Ti_3Al-based alloy
thermal stability
oxygen-enriched layer
