Effect of Heat Treatment on Microstructures and Mechanical Properties of a Novel -Solidifying TiAl Alloy

被引：16
作者：
Cui, Ning [1 ]
Wu, Qianqian [1 ]
Bi, Kexiao [1 ]
Xu, Tiewei [1 ]
Kong, Fantao [2 ]
机构：
[1] Qingdao Univ Technol, Sch Mech & Automot Engn, Qingdao 266520, Shandong, Peoples R China
[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China
来源：
MATERIALS | 2019年 / 12卷 / 10期
基金：
中国国家自然科学基金;
关键词：
TiAl alloy; phase; heat treatment; mechanical properties; DEFORMATION MECHANISMS; TENSILE PROPERTIES; GAMMA; BEHAVIOR; FRACTURE; DESIGN; TRANSITION; EVOLUTION; DIFFUSION; CR;
D O I：
10.3390/ma12101672
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of heat treatment on the microstructures and mechanical properties of a novel -solidifying Ti-43Al-2Cr-2Mn-0.2Y alloy was investigated. A fully lamellar (FL) microstructure with a colony size of about 100 m was obtained by heat treatment at 1320 degrees C/10 min/furnace cooling (FC). A duplex (DP) microstructure with globular grains and /(2) lamellae was obtained by heat treatment at 1250 degrees C/4 h/FC. The residual hard-brittle (0) phase was also eliminated after heat treatment. The mechanical properties of the -solidifying TiAl alloy depended closely on the heat treatment. The FL alloy had better fracture toughness, and the fracture toughness (K-IC) value was 24.15 MPam(1/2). The DP alloy exhibited better ductility, and the room temperature (RT) elongation of the alloy could reach 1%. The elongation of the alloy with different microstructures sharply increased when the temperature increased from 700 to 750 degrees C, indicating that the microstructure had no effect on the ductile-brittle transition temperature of the -solidifying TiAl alloy. The fracture morphologies of different tensile specimens were observed. Interlamellar and translamellar fractures were the main fracture features of the FL alloy. Intergranular, translamellar, and interlamellar fractures were the main fracture features of the DP alloy.
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页数：12
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