Effects of extrusion deformation on microstructure, mechanical properties and hot workability of β containing TiAl alloy

被引：32
|
作者：
Xu, W. C. [1 ]
Shan, D. B. [1 ]
Zhang, H. [2 ]
Li, X. A. [1 ]
Zhang, Y. Z. [3 ]
Nutt, S. [3 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China
[3] Univ So Calif, Dept Chem Engn & Mat Sci, Los Angeles, CA 90089 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 571卷
关键词：
Intermetallics; TiAl alloys; Hot extrusion; Mechanical properties; Hot workability; GAMMA-TITANIUM ALUMINIDES; PHASE-TRANSFORMATIONS; HIGH-STRENGTH; COMPONENTS; DUCTILITY;
D O I：
10.1016/j.msea.2013.02.005
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Hot extrusion was performed on a Ti-42Al-9V-0.3Y alloy at 1200-1325 degrees C to explore effects on mechanical properties and hot workability. The microstructure after hot extrusion was analyzed, tensile tests were conducted, and hot workability was assessed. Three types of microstructures resulted from extrusion at increasing temperature, including a dual-phase microstructure (DPM), a bi-lamellar microstructure with retained gamma phase (BLMG), and a bi-lamellar microstructure (BLM). Hot extrusion of the TiAl alloy in the range of 1275-1325 degrees C produced the BLM microstructure, yielding superior comprehensive properties. The predominant fracture mode was transgranular cleavage fracture in the DPM, translamellar cleavage and delamination in BLM, and mixed fracture in BLMG. Aggregation of the YAl2 phase accelerated the fracture of the as-extruded alloy. As-extruded Ti-42Al-9V-0.3Y alloy exhibited excellent high-temperature mechanical properties and hot workability, demonstrating the feasibility of precision forming TiAl alloy components by conventional hot forging with nickel-based alloy dies. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：199 / 206
页数：8
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