MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Room Temperature Aging Characteristic of MgLiAlZn Alloy
Chang-Chan HsuJian-Yih WangShyong Lee
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2008 Volume 49 Issue 11 Pages 2728-2731

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Abstract

Making alloys of Mg and Li is quite a task as their individual melting temperatures are vastly different. However, it is thought paid off considering their extreme lightness. Basically, low melting temperature Li could cause Mg-Li alloys’ microstructures change at room temperature (R.T.). Recrystallization and aging of Li-rich solid solution phase (β) can proceed under R.T. Previously, R.T. aging phenomenon was mentioned without in-depth analysis. This paper fills up the blank by working on Mg-11.2%Li-0.95%Al-0.43%Zn (mass%), mainly due to the TEM work brought in. With this apparatus for analysis, a transition precipitate (tentatively called pre-θ phase) is revealed. This pre-θ precipitation is responsible for the distinctive strengthening in the initial stage of R.T. aging. However, it is unstable and subsequently transforms to θ or α phase. Both of these later precipitates are little effective in producing aging strengthening.

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© 2008 The Japan Institute of Metals and Materials
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