二级时效处理对Ti-3Al-7Fe合金组织和硬度的影响  

Influence of Two Stages Aging Treatment on Microstructure and Hardness of Ti-3Al-7Fe Alloy

作　　者：黄士星 林成[1] 张秀良 于佳石 尹桂丽[1] 张爱民[1] 赵志伟[1] 

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001 [2]内蒙古黄陶勒盖煤炭有限责任公司巴彦高勒煤矿,内蒙古乌审017312

出　　处：《热加工工艺》2016年第18期182-187,共6页Hot Working Technology

基　　金：国家自然科学基金项目(51201084)

摘　　要：研究了二级时效对Ti-3Al-7Fe合金组织和硬度的影响。结果表明,合金经889℃×40 min固溶并第一级时效(350℃)+第二级时效(600℃×8 h)处理后,合金组织中析出的α相弥散分布,未出现与β相混合的片状α相;第一级时效为300℃时,二级时效处理也能使合金组织中析出较多α相,但是α相发生聚集,合金组织不均匀;单级时效处理和第一级时效分别为400、450℃的二级时效处理后,Ti-3Al-7Fe合金组织中在晶界及亚晶界附近出现了夹杂残余β相的片状α相,且合金的组织不均匀。单级时效处理和二级时效处理后,合金的硬度较固溶处理具有较高的硬度。The influences of two stage aging on microstructure and hardness of Ti-3AI-7Fe alloy were investigated. The results indicate that α phase in alloy microstructure is disperse distribution, and no lamellar phases mixed with β phases are found in the microstructure after solid solution of 889℃×40 rain and then the first stage aging （350℃）＋second stage aging （600℃×8 h） treatment; when the first-stage aging treatment is 300℃, two stages aging treatment can also make the alloy microstructure separate the α phase, but the aggregation happens, and the microstructure in alloy is not uniform; lamellar et phases mixed with β phases arise near the grain boundary and sub-grain boundary in the mierostructure of Ti-3A1-7Fe alloy after the single stage aging treatment or two stages aging treatment （the first stage aging treatment of 400 and 450℃）, and the microstructure is uneven. The hardness of the alloy is higher than that of the solid solution treatment after single stage aging treatment and two stages aging treatment.

关 键 词：Ti-3Al-7Fe 二级时效 棕 相变 组织和硬度 

分 类 号：TG166.5[金属学及工艺—热处理]