Effects of Zn additions on the grain boundary precipitation and corrosion of Al-5083

被引：145

作者：

Carroll, MC ^{[1
]}

Gouma, PI

Mills, MJ

Daehn, GS

Dunbar, BR

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

[2] Century Aluminum Corp, Ravenswood, WV USA

来源：

SCRIPTA MATERIALIA | 2000年 / 42卷 / 04期

关键词：

electron diffraction; transmission electron microscopy; aluminum alloys; grain boundaries; corrosion;

D O I：

10.1016/S1359-6462(99)00349-8

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The formation of a ternary Al-Mg-Zn phase along grain boundaries when Zn is added in levels of between 0.68 and 0.70% to an otherwise standard Al-5083 alloy composition is demonstrated by transmission electron microscopy (TEM) observations, coupled with energy dispersive spectroscopy (EDS) investigations. Zinc additions to sensitized 5083-based Al-Mg-Mn alloys precludes the formation of β-phase precipitates, resulting instead in the formation of Al-Mg-Zn τ-phase at grain and subgrain boundaries. The τ-phase is more resistant to corrosion than the β-phase, evidenced by preliminary exfoliation test performance and by the lesser degree of degradation of the secondary phase following electropolishing of TEM foils.

引用

页码：335 / 340

页数：6