期刊
MATERIALS TRANSACTIONS
卷 46, 期 11, 页码 2437-2442出版社
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.46.2437
关键词
precipitation hardening; aluminium-magnesium-silver; microstructural characterization; beta phase; Al3Mg2
The structure and morphology of coarse-scale globular and smaller spheroidal particles in an isothermally aged Al-10Mg-0.5Ag (mass%) alloy have been charcterised by means of transmission electron microscopy. Coarse-scale globular and smaller spheroidal particles were commonly observed in an over-aged sample aged for 72 h at 240 degrees C. The coarse-scale globular and smaller spheroidal particles were identified by electron microdiffraction to have the face-centered cubic structure of equilibrium beta phase (Al3Mg2) (lattice parameter a = 2.824nm). The orientation relationship between the beta phase and alpha-Al matrix was such that: (100)(beta)//(100)(alpha) and [001](beta)//[001]. This orientation relationship differs from those reported previously for the beta phase formed in binary Al-Mg alloys. The coarse-scale globular beta particles had invariably internal faulted structures.
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