The effect of trace elements on the sintering of an Al-Zn-Mg-Cu alloy

被引：57
|
作者：
Schaffer, GB [1 ]
Huo, SH
Drennan, J
Auchterlonie, GJ
机构：
[1] Univ Queensland, Dept Min Minerals & Mat Engn, Brisbane, Qld 4072, Australia
[2] Univ Queensland, Ctr Microscopy & Microanal, Brisbane, Qld 4072, Australia
来源：
ACTA MATERIALIA | 2001年 / 49卷 / 14期
基金：
澳大利亚研究理事会;
关键词：
sintering; aluminium; trace elements;
D O I：
10.1016/S1359-6454(01)00177-X
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Trace elements can have a significant effect on the processing and properties of aluminium alloys, including sintered alloys. As little as 0.07 wt% (100 ppm) lead, tin or indium promotes sintering in an Al-Zn-Mg-Cu alloy produced from mixed elemental powders. This is a liquid phase sintering system and thin liquid films form uniformly throughout the alloy in the presence of the trace elements, but liquid pools develop in their absence. Analytical transmission electron microscopy indicates that the trace elements are confined to the interparticle and grain boundary regions. The sintering enhancement is attributed to the segregation of the microalloying addition to the liquid-vapour interface. Because the microalloying elements have a low surface tension, they lower the effective surface tension of the liquid. This reduces the wetting angle and extends the spreading of the liquid through the matrix. An improvement in sintering results. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：2671 / 2678
页数：8
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