Effect of Erbium on Precipitation of Aged Al-Zn-Mg-Cu-Li Alloy

Abstract:

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0.3%Er is added to Al-5.6Zn-1.9Mg-1.6Cu-1.0Li alloy (in wt.%) to investigate the effect of erbium on microstructure of the alloy. Most of erbium exists in the primary Al3Er phases which are incoherent with the alloy matrix unevenly. A few of fine Al3Er phases, precipitated from supersaturated solid solution, are coherent with the matrix. η′-MgZn2 precipitates in the single-aged alloy are sparser than that in the double-aged alloy. A few of fine Al3Er phases act as the heterogeneous sites of η phases. There exist some precipitation free zones in the matrix around fine Al3Er precipitates. Erbium is segregated to grain boundary seriously. A few of Al3Er phases are present in grain boundary. The grain boundary precipitates are not continuous about the Al3Er phases.

Info:

Periodical:

Advanced Materials Research (Volumes 233-235)

Edited by:

Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He

Pages:

2193-2196

DOI:

10.4028/www.scientific.net/AMR.233-235.2193

Citation:

Z. K. Zhao et al., "Effect of Erbium on Precipitation of Aged Al-Zn-Mg-Cu-Li Alloy", Advanced Materials Research, Vols. 233-235, pp. 2193-2196, 2011

Online since:

May 2011

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Price:

$35.00

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