热处理对Ti-48Al-6Nb-xSi合金组织与力学性能的影响  

Effects of Heat Treatment on the Structure and Mechanical Properties of Ti-48Al-6Nb-xSi Alloys

作　　者：徐琴[1,2] 毕晓勤[1] 吴超[1] 曹文超 周澍 陈瑞润 Xu Qin;Bi Xiaoqin;Wu Chao;Cao Wenchao;Zhou Shu;Chen Ruirun(School of Mechanic and Electrical Engineering,Henan University of Technology;National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology;School of Materials Science and Engineering,Shandong University of Science and Technology)

机构地区：[1]河南工业大学机电工程学院,郑州450001 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [3]山东科技大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2020年第7期735-739,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金杰出青年科学基金资助项目(51825401);华中科技大学材料成形与模具技术国家重点实验室开放基金资助项目(P2020-023);河南省科技攻关项目(182102110096)。

摘　　要：制备了不同Si含量的Ti-48Al-6Nb-xSi(x=0.5、1、2,摩尔分数,%)钛铝合金铸锭,并对其进行不同温度下的热处理,研究了热处理温度对铸锭组织和显微硬度的影响。结果表明,与铸态组织相比,热处理后铸件的组织均得到细化。随着热处理温度升高,合金的等轴晶区域逐渐变大,柱状晶的宽度变小,片层间距减小。热处理后合金的显微组织由初始的柱状晶逐渐转变为等轴晶,Ti5Si3相的含量减少,但分布更加均匀。Ti-48Al-6Nb-xSi合金的显微硬度随着Si含量的增加而提高,随着热处理温度的升高而降低。Ti-48Al-6Nb-xSi(x=0.5,1 and 2)TiAl alloy ingots with different silicon addition were prepared,and then heat treated at different temperature,respectively.The effects of heat treatment temperature on the structure and mechanical properties of the Ti-48Al-6Nb-xSi alloy ingots were analyzed.The results show that the structure of the as-cast ingots are refind after heat treatment and the equiaxed grain area inthe ingots is increased and the width of the column grains become smaller with the increasing of the heat treatment temperature.Meanwhile,the lamellar structure become thinner.The microstructure of the alloy is changed from column grain structure to equiaxed grain structure with increasing of heat treatment temperature.And the amount of Ti5Si3 phase is reduced,while its distribution become more uniform.The microhardness of Ti-48Al-6Nb-xSi alloys is increased with silicon content increasing and decreased with increasing of the heat treatment temperature.

关 键 词：热处理 钛铝合金 组织 显微硬度 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG156.9[金属学及工艺—金属材料]