铸造技术2026，Vol.47Issue(3)：249-258,10.DOI:10.16410/j.issn1000-8365.2026.5274
中温应力作用下Ti-42Al-6.5V-2Zr合金淬火马氏体的演变机制
Evolution Mechanism of Quenched Martensite in Ti-42Al-6.5V-2Zr Alloy under Intermediate-temperature Stress
摘要
Abstract
TiAl alloys demonstrate significant application potential in the aerospace field because of their low density,high specific stiffness and strength,and excellent high-temperature mechanical properties.However,challenges such as poor room-temperature plasticity,limited damage tolerance,and difficulties in hot working still hinder their widespread use in practical engineering.Research has suggested that obtaining a uniform and fine lamellar microstructure through microstructural control is an effective approach for enhancing room-temperature plasticity and improving workability.This study focused on a Ti-42Al-6.5V-2Zr alloy,which was subjected to quenching from the β single-phase region to obtain a microstructure dominated by lath martensite α2.Subsequent holding and loading experiments were performed on the martensitic structure to achieve microstructural refinement of the TiAl alloy.The subsequent microstructural evolution during intermediate-temperature holding and loading was studied by high-energy X-ray diffraction.The applied stress significantly promotes the phase transformation from α2 to γ.The mechanical anisotropy between the α2 and γ phases leads to rapid accumulation of elastic strain energy and crystal defects within the α2 phase,which markedly accelerates the formation of the lamellar γ phase.关键词
TiAl合金/热处理/马氏体/高能X射线衍射Key words
TiAl alloys/heat treatment/martensite/high energy XRD diffraction分类
矿业与冶金引用本文复制引用
杜亚丽,宋霖,张铁邦,李小兵..中温应力作用下Ti-42Al-6.5V-2Zr合金淬火马氏体的演变机制[J].铸造技术,2026,47(3):249-258,10.基金项目
国家自然科学基金(52471145) （52471145）
凝固技术全国重点实验室(2025-QZ-02) （2025-QZ-02）
新金属材料全国重点实验室(2025-Z06) （2025-Z06）
中央高校基本科研业务费(D5000250265) （D5000250265）
