Effect of tungsten dissolution on the mechanical properties of Ti-W composites

被引:36
作者
Choe, H
Abkowitz, SM
Abkowitz, S
Dunand, DC [1 ]
机构
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Dynamet Technol Inc, Burlington, MA 01803 USA
基金
美国国家卫生研究院;
关键词
composite materials; dental alloys; powder metallurgy; mechanical properties; metallography;
D O I
10.1016/j.jallcom.2004.08.021
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
Blends of 90 wt.% Ti and 10 wt.% W powders were consolidated by powder metallurgy. using an initial W powder size that was very fine (0.7 and 2 mum) or very coarse (<250 mum). Dissolution of W powders in the Ti matrix during consolidation was almost complete for the former blends (thus forming Ti-10W "alloys") but very limited for the latter blend (thus forming a Ti-10W "composite"). The Ti-10W alloys exhibit much higher yield and tensile strengths than the Ti-10W composite, indicating that tungsten strengthens titanium more efficiently as a solute atom (solid-solution strengthening) than as a second phase (composite strengthening by load transfer). The Ti-10W alloys also exhibit much higher ductility than the Ti-10W composite, whose brittle W particles exhibit fracture or pull-out from the matrix. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:62 / 66
页数:5
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