Supersaturated solid solution of niobium in copper by mechanical alloying

被引:107
作者
Botcharova, E [1 ]
Heilmaier, M
Freudenberger, J
Drew, G
Kudashow, D
Martin, U
Schultz, L
机构
[1] IFW Dresden, Inst Met Mat, D-01171 Dresden, Germany
[2] Freiberg Univ Min & Technol, Inst Phys Met, D-09596 Freiberg, Germany
关键词
transition metal alloys; mechanical alloying; mechanical properties; microstructure; transmission electron microscopy;
D O I
10.1016/S0925-8388(02)01025-3
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
Alloys with both high strength and high conductivity have been produced by mechanical alloying. In the present study, copper was mechanically alloyed with 5, 10 and 20 at.% Nb using a planetary ball mill. The Cu-Nb phase diagram shows a negligibly low mutual solubility in the solid state, but high energy ball milling can largely extend the region of solid state solution. Previously, it was observed that niobium partly dissolves in the copper lattice during milling. The present investigation demonstrates that this limit can be extended to a strongly supersaturated Cu solid solution of up to 10 at.% Nb provided the appropriate mechanical alloying method is applied. The change in the powder microstructure was followed by scanning and transmission electron microscopy (TEM) as well as by X-ray diffraction (XRD) analysis. In the case of Cu-5%Nb and Cu-10%Nb a homogeneous single-phase microstructure was obtained after 30 It of milling. Elemental Nb could no more be detected, indicating the formation of a metastable supersaturated Cu-Nb solid solution. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:119 / 125
页数:7
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