河南科技大学学报（自然科学版）2025，Vol.46Issue(6)：1-8,8.DOI:10.15926/j.cnki.issn1672-6871.2025.06.001
热压烧结制备高Nb-TiAl合金及其碳化物增强复合材料的工艺与组织研究
Processing and Microstructure of Hot-Press Sintered High-Nb-TiAl Alloys and Their Carbide-Reinforced Composites
摘要
Abstract
This study systematically investigates the forming processes and microstructural evolution of high-Nb TiAl alloys and their carbide-reinforced composites.It focuses on analyzing the effects of ball-milled powder blending and hot-press sintering parameters on microstructure,while revealing the variation patterns of oxygen mass fraction during forming process.Results indicate that in the sintering temperature range of 1 350～1 450℃,the 1 425℃-30 MPa-20 min process yields a dense TiAl alloy with uniform fully lamellar microstructure.Ball milling represents the primary stage contributing to oxygen mass fraction increase.Glove box purging proves more effective than vacuum pump purging in reducing oxygen mass fraction.The high oxygen mass fraction(3.63%)in nano-TiC powder causes oxygen mass fraction in sintered specimens to increase proportionally with powder loading.Compared to the 150 r/min-8 h mixing process,the 200 r/min-8 h parameters significantly improve the dispersion uniformity of nano-TiC particles and suppress carbide agglomeration in TiAl-based composites by enhancing powder fragmentation and specific surface area.关键词
粉末冶金/TiAl合金/复合材料/工艺优化/显微组织Key words
powder metallurgy/TiAl alloys/composite materials/process optimization/microstructure分类
矿业与冶金引用本文复制引用
王慧君,杨潆,李娟,孙定邦,陈佳莹,梁永锋,林均品..热压烧结制备高Nb-TiAl合金及其碳化物增强复合材料的工艺与组织研究[J].河南科技大学学报（自然科学版）,2025,46(6):1-8,8.基金项目
国家自然科学重点基金项目(52531004) （52531004）
重点新材料研发及应用国家科技重大专项(2025ZD0609100) （2025ZD0609100）
