Grain boundary reaction in Mg-9mass%Al alloys

Aging characteristics of Mg-9mass%Al alloy have been investigated by means of hardness measurement and microstructure observation with optical and electron microscopy. Hardness increased by about HV30 with aging time at temperatures between 403-473K. The hardness increase was found to be caused by t...

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Bibliographic Details
Published inJournal of Japan Institute of Light Metals Vol. 44; no. 4; pp. 229 - 233
Main Authors HORI, Shigenori, HAMANO, Isamu, NAGAHATA, Kazuhiro, TAMURA, Ken, ABE, Mutsumi, TAI, Hideo
Format Journal Article
LanguageJapanese
English
Published The Japan Institute of Light Metals 1994
Subjects
age hardening
C-curve
grain boundary reaction
Mg-Al alloy
nodule
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Summary:Aging characteristics of Mg-9mass%Al alloy have been investigated by means of hardness measurement and microstructure observation with optical and electron microscopy. Hardness increased by about HV30 with aging time at temperatures between 403-473K. The hardness increase was found to be caused by the continuous and discontinuous precipitation. The TTT diagram for the phase decomposition was determined from the hardness curves, the nose temperature being 523K. The initiation and growth of the grain boundary reaction occur in competition with well-advanced continuous precipitation process. The apparent activation energy for grain boundary reaction is also described.
ISSN:0451-5994
1880-8018
DOI:10.2464/jilm.44.229