Microstructure and mechanical properties of Ti/W and Ti-6Al-4V/W composites fabricated by powder-metallurgy

被引:44
作者
Frary, M
Abkowitz, S
Abkowitz, SM
Dunand, DC
机构
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Dynamet Technol Inc, Burlington, MA 01803 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 344卷 / 1-2期
基金
美国国家科学基金会;
关键词
Ti/W and Ti-6Al-4V/W composites; powder-metallurgy; mechanical properties;
D O I
10.1016/S0921-5093(02)00426-4
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Tungsten-reinforced Ti and Ti-6Al-4V composites were fabricated by powder metallurgical techniques from Ti, W and Al-V powders. The microstructure of the composites consists of partially dissolved tungsten particles within an alpha/beta titanium matrix containing tungsten in solid-solution. Yield and ultimate tensile strengths increase linearly with tungsten content in the range 0-15 wt.% W and decrease near-linearly with temperature in the range 25-540 degreesC. Ductility follows the opposite trend and is within technologically acceptable values, except for Ti/15W at 315 and 425 degreesC and Ti/10W at 540 degreesC which fractured near the ultimate stress value. The Ti-6Al-4V/10W composite shows the best combination of high strength and ductility at all temperatures. At ambient temperatures, Ti/10W exhibits a stress-strain curve very similar to Ti-6Al-4V (with a slight decrease in stiffness), while eliminating aluminum and vanadium alloy elements. Further improvements in mechanical properties of these non-equilibrium composites are likely to be achieved through optimized heat-treatments, which affect the matrix microstructure and the degree of dissolution of tungsten and thus the relative importance of matrix solid-solution strengthening and composite strengthening. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码:103 / 112
页数:10
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