铸造技术2025，Vol.46Issue(2)：99-109,11.DOI:10.16410/j.issn1000-8365.2025.4158
Ti2AlNb合金薄板热处理过程中O相析出行为
Precipitation Behavior of O-Phase in Ti2AlNb Alloy Sheets During Heat Treatment
摘要
Abstract
Ti2AlNb alloys can operate for extended periods at temperatures between 650 and 750℃,offering high specific strength,excellent room-temperature fracture toughness,and good creep resistance.These properties make Ti2AlNb alloys one of the most promising lightweight metallic materials for high-temperature applications.The alloy sheets,with a final thickness of 1 mm,were produced via a clad rolling process,employing a nominal composition of Ti-22Al-24Nb-0.5Mo(at.%)as the rolling material.After the rolled sheets were subjected to solution aging treatment,a significant amount of O-phase precipitated.As the aging temperature increases,the O-phase lamellae grow coarser,and the amount of precipitated O-phase initially increases but then decreases.At 930℃,the volume fraction of the precipitated O-phase reaches its maximum value of 52%.Under this heat treatment regime,the nucleation mechanisms for O-phase precipitation include both interfacial instability nucleation and induced nucleation.However,near grain boundaries,the O-phase tends to nucleate and precipitate predominantly through induced nucleation,with fewer O-phase particles forming through interfacial instability nucleation.Following solution treatment at 1 000℃and aging at 815℃,as well as solution treatment at 920℃and aging at 800℃,the resulting microstructures are bimodal.The solution aging process after rolling has little effect on the precipitation of O-phase variants.关键词
Ti2AlNb合金/包套轧制/微观组织/变体选择Key words
Ti2AlNb alloy/clad rolling/microstructure/variant selection分类
矿业与冶金引用本文复制引用
周亦奇,唐斌,张智鑫,邵启航,陈晓飞..Ti2AlNb合金薄板热处理过程中O相析出行为[J].铸造技术,2025,46(2):99-109,11.基金项目
重庆市自然基金面上项目(CSTB2023NSCQ-MSX0824) （CSTB2023NSCQ-MSX0824）
重庆市技术创新与应用发展专项(CSTB2022TIAD-KPX0032) （CSTB2022TIAD-KPX0032）
