HRTEM Observation of Precipitates at Early Stage of Aging in Mg-Gd-Zr Alloy

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High resolution transmission electron microscopy(HRTEM)observation was performed to clarify morphology of precipitates at early stage of aging in Mg-Gd-Zr alloy. In the specimen aged at 423K, monolayer was observed on {1100}Mg planes. With increasing aging time, the monolayer and β” phase grew along the <1120>Mg directions. Arrangement of bright dots corresponding to {020}β’ except for the monolayer and β” phase was observed before peak aging stage. β’ phases formed at the same aging stage. Thus, these precipitates co-existed before peak aging stage. The monolayer, β” phase and β’ phase still co-existed in the peak aged specimen. The β’ phase was dominated in the peak hardness. It is revealed that the monolayer lying on {1100}Mg act as precursor of β” phase and β’ phase.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

303-306

Citation:

T. Kawabata et al., "HRTEM Observation of Precipitates at Early Stage of Aging in Mg-Gd-Zr Alloy", Materials Science Forum, Vols. 561-565, pp. 303-306, 2007

Online since:

October 2007

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