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

Xu Qin; Bi Xiaoqin; Wu Chao; Cao Wenchao; Zhou Shu; Chen Ruirun

doi:10.15980/j.tzzz.2020.07.009

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Effects of Heat Treatment on the Structure and Mechanical Properties of Ti-48Al-6Nb-xSi Alloys
Vol. 40, Issue 7, Pages: 735-739(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.07.009

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[1]徐琴,毕晓勤,吴超,曹文超,周澍,陈瑞润.热处理对Ti-48Al-6Nb-xSi合金组织与力学性能的影响[J].特种铸造及有色合金,2020,40(07):735-739.

Xu Qin, Bi Xiaoqin, Wu Chao, et al. Effects of Heat Treatment on the Structure and Mechanical Properties of Ti-48Al-6Nb-xSi Alloys. [J]. Special Casting & Nonferrous Alloys 40(7):735-739(2020)
[1]徐琴,毕晓勤,吴超,曹文超,周澍,陈瑞润.热处理对Ti-48Al-6Nb-xSi合金组织与力学性能的影响[J].特种铸造及有色合金,2020,40(07):735-739. DOI： 10.15980/j.tzzz.2020.07.009.

Xu Qin, Bi Xiaoqin, Wu Chao, et al. Effects of Heat Treatment on the Structure and Mechanical Properties of Ti-48Al-6Nb-xSi Alloys. [J]. Special Casting & Nonferrous Alloys 40(7):735-739(2020) DOI： 10.15980/j.tzzz.2020.07.009.

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

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。

Abstract

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 Ti

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.