Microstructural evolution and final properties of a cold-swaged multifunctional Ti-Nb-Ta-Zr-O alloy produced by a powder metallurgy route

被引：30
作者：
Guo, W. [1 ,2 ]
Quadir, M. Z. [1 ,2 ,3 ]
Moricca, S. [4 ]
Eddows, T. [4 ]
Ferry, M. [1 ,2 ]
机构：
[1] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
[2] Australian Res Council, Ctr Excellence Design Light Met, Canberra, ACT, Australia
[3] Univ New S Wales, Elect Microscope Unit, Sydney, NSW 2052, Australia
[4] Australian Nucl Sci & Technol Org, Inst Mat Engn, Sydney, NSW 2232, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 575卷
基金：
澳大利亚研究理事会;
关键词：
Gum Metal; Multifunctional titanium alloy; Forging; Swaging; Microstructure and texture; Mechanical properties; PLASTIC-DEFORMATION; GUM METAL; OMEGA-PHASE; MECHANICAL-PROPERTIES; BEHAVIOR; MODE;
D O I：
10.1016/j.msea.2013.03.029
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Body centred cubic (BCC) beta-phase multifunctional titanium alloys have been developed with a very unique combination of thermal and mechanical properties. In this investigation, a very low porosity Ti-36.8-Nb-2.7Zr-2.0Ta-0.44O (wt%) alloy was produced by powder sintering, hot forging, solution treatment and cold swaging. X-ray diffraction and transmission electron microscopy (TEM) of the solution treated alloy revealed the presence of a small amount of omega-phase in a predominantly BCC beta-phase matrix. Electron backscatter diffraction (EBSD) of the swaged alloy revealed a highly elongated and fragmented microstructure, and a strong < 110 > fibre texture. TEM also revealed the existence of stress-induced twin lamella, dislocations and omega-phase. Consistent with previous studies on these types of alloys, the swaged alloy exhibited non-linear elasticity during tensile straining, low elastic modulus (45.4 GPa), high elastic limit (2.3%), high elongation to failure (8.1%), and a high yield strength (880 MPa) and tensile strength (940 MPa). The coefficient of thermal expansion was also low (similar to 5 x 10(-6) K-1 between 50 and 300 degrees C) in this alloy. (C) 2013 Elsevier B.V. All rights reserved.
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页码：206 / 216
页数：11
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