Role of graphite on microstructural evolution and mechanical properties of ternary TiAl alloy prepared by arc melting method

被引：56

作者：

Fang, Hongze ^{[1
]}

Chen, Ruirun ^{[1
,2
]}

Yang, Yong ^{[1
]}

Su, Yanqing ^{[1
]}

Ding, Hongsheng ^{[1
]}

Guo, Jingjie ^{[1
]}

Fu, Hengzhi ^{[1
]}

机构：

[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China

来源：

MATERIALS & DESIGN | 2018年 / 156卷

基金：

中国国家自然科学基金;

关键词：

TiAl; Carbon; TiC particles; Ti2AlC particles; Tensile properties; TIAL/TI2ALC COMPOSITES; DEFORMATION-BEHAVIOR; TENSILE PROPERTIES; MATRIX COMPOSITES; HIGH-NB; TI2ALC; CARBON; GAMMA; POWDERS;

D O I：

10.1016/j.matdes.2018.06.048

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ternary Ti-30.7wt%Al-xC alloys were prepared with different carbon content (x = 0.2,0.4.0.8, 1.2. 1.6. and 2.0 wt %) by vacuum arc melting in order to improve the strength and ductility. Microstructure evolution and mechanical properties of alloys were experimentally and statistically studied, especially the carbide formation mechanism. The results show that Ti2AlC phase appears when carbon content is >0.4%, and its volume fraction increases with increasing carbon content. Lamellar colony size, lamellar space and length-diameter of Ti2AlC phase decrease with increasing carbon. Carbon has the certain solid solubility in matrix. Carbides form when addition of carbon content is over the solid solubility limit. Ti2AlC acts as heterogeneous nucleation particles and carbon decreases the rate of lateral thickening of gamma lamellae plates, which are the reasons for refining microstructure. High-melting-point TiC particles act as nucleation particles to form Ti2AlC and refine the Ti2AlC with more TiC content. Tensile strength increases 1.6 times at 750 degrees C. with increasing carbon content. Tensile strength increases 1.5 times from 750 degrees C to 850 degrees C with 0.8% carbon and the maximum strain is 3.7%. Precipitation strengthening of Ti2AlC particles and grain boundary strengthening are mainly mechanisms to improve mechanical properties. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：300 / 310

页数：11

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