MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
HRTEM Observation of Metastable Phases in a Mg–15%Gd–6.4%Sc Alloy
Tokimasa KawabataKenji MatsudaSusumu Ikeno
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2010 Volume 51 Issue 2 Pages 301-304

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Abstract

The aging behavior of a ternary Mg–15%Gd–6.4%Sc (mass%) alloy was examined by high-resolution transmission electron microscopy. During the first stage of age hardening of the alloy, a contrast corresponding to a precursor of the β″ phase was observed predominantly. The β″ and β′ phases coexist in the second stage of hardening, up to the point of maximum hardness. In the over-aging stage, the spheroidal contrast of the β′ phase became longer along the ⟨1\\bar100⟩Mg direction. The addition of Sc to the Mg-Gd alloys is useful to clarify the precipitation behavior and contribution of the β″ and β′ phases to age hardening, as indicated by the two stage in the early stage of aging.

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© 2010 The Japan Institute of Metals and Materials
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