Effect of trace addition of Sn in Al-Cu alloy

被引：24

作者：

Honma, Tomoyuki ^{[1
]}

Saxey, David W. ^{[1
]}

Ringer, Simon P. ^{[1
]}

机构：

[1] Univ Sydney, Australian Key Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

来源：

ALUMINIUM ALLOYS 2006, PTS 1 AND 2: RESEARCH THROUGH INNOVATION AND TECHNOLOGY | 2006年 / 519-521卷

关键词：

Al-Cu-Sn; Al-Cu; three-dimensional atom probe; cluster; precipitate; GP zone;

D O I：

10.4028/www.scientific.net/MSF.519-521.203

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The trace addition of Sn (0.01 at.%) to an Al-1.7Cu (at.%) alloy has been investigated using atom probe tomography (APT), transmission electron microscopy (TEM) and high resolution transmission electron microscope (HRTEM). We have studied samples in the as-quenched (AQ) condition and following ageing at both 160 and 200 degrees C for very short ageing times so as to better understand the early stages of the decomposition processes. Our data reveal independent Cu-Cu and Sn-Sn clusters in the AQ condition, though we did not observe Cu-Sn clustering. We observed for the first time that some of these initial Cu-clusters develop into GP zones during subsequent ageing at temperatures as high as 200 degrees C. The Sri atom clustering results in precipitation of independent beta-Sn particles after aging for 30 sec. The GP zones consequently undergo reversion and this liberates Cu atoms which seem to participate in a cluster-assisted heterogeneous nucleation of the theta' phase at the interface of the beta-Sn. For ageing at 200 degrees C, this process is complete within 180 sec.

引用

页码：203 / 208

页数：6

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