航空材料学报2026，Vol.46Issue(1)：30-40,11.DOI:10.11868/j.issn.1005-5053.2025.000159
激光选区熔化TiAl合金成形和组织演变规律及机制
Forming behavior and microstructural evolution mechanisms of TiAl alloys processed by selective laser melting
摘要
Abstract
TiAl alloys exhibit poor room-temperature ductility,which poses a challenge for traditional casting and forging processes to fulfill the manufacturing demands for complex structural components.Selective laser melting(SLM)technology,renowned for its short manufacturing cycle,high material utilization,and exceptional forming accuracy,is deemed well-suited for fabricating complex parts in the aerospace industry.In this research,Ti48Al2Cr2Nb alloy powder is mixed with 4%(mass fraction)FeMo60 alloy powder to formulate an alloy with a nominal composition of Ti47Al3.5Cr1Nb1Mo1Fe.By employing a chessboard overlap scanning strategy(which mitigates thermal stress during processing)and optimizing printing parameters,SLM fabrication of the TiAl alloy with a remarkably low defect rate(only 0.49%)is successfully accomplished.Moreover,the samples are characterized using X-ray diffraction and scanning electron microscopy to explore the underlying reasons for microstructure formation.Additionally,a substantial portion of the α2 phase in the as-printed alloy is converted into the γ phase through heat treatment.Simultaneously,the unmelted FeMo60 powder from the printing process is dissolved,achieving solid solution strengthening.This phenomenon leads to a significant 30%enhancement in the compressive strength.This study offers a crucial reference for the preparation of high-performance TiAl alloys with complex geometries.关键词
TiAl合金/激光选区熔化技术/热处理/组织演变/力学性能Key words
TiAl alloy/selective laser melting(SLM)/heat treatment/microstructural evolution/mechanical property分类
航空航天引用本文复制引用
陈思宇,于竞越,潘佳呈,周灵燕,査敏,方虹泽..激光选区熔化TiAl合金成形和组织演变规律及机制[J].航空材料学报,2026,46(1):30-40,11.基金项目
国家自然科学基金面上项目(52474377) （52474377）
