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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.4 (2003)  >  pp.619-624

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Precipitation in Mg-(4-13)%Li-(4-5)%Zn Ternary Alloys

Atsushi Yamamoto1), Tetsuya Ashida1), Yoshio Kouta1), Kwang Bae Kim1), Shinji Fukumoto1) and Harushige Tsubakino1)
1) Graduate School of Engineering, Himeji Institute of Technology

Precipitations in Mg–Li–Zn ternary alloys containing 4 to 13%Li and 4 to 5%Zn (in mass%) with α or β single phase, or with (α+β) dual phases were investigated using a micro-Vickers hardness measurement and transmission electron microscopy. Age hardening in the α phase alloy was found to occur, which was attributed to the precipitation of the stable θ (MgLiZn) phase with the following orientation relationships: [10\bar10]α||[110]θ, (0001)α||(1\bar1\bar1)θ. In the (α+β) phases alloy, the precipitation of the α phase together with the metastable θ′ (MgLi2Zn) phase occurred at grain boundaries between the α and β, and also β and β grains. The orientation relationships between the α and θ′ were as follows; (0001)α||(01\bar1)θ′, [0\bar110]α||[111]θ′. Age hardening in the β alloy was caused by the precipitation of the θ′ phase and over-aging was attributed to the precipitation of the α and θ phases.

Mg-Li-Zn alloy, precipitation, metastable phase, transmission electron microscopy (TEM), age hardening

Received: October 21, 2002
Accepted: February 05, 2003 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Light Metals



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