Effect of aging treatment on dynamic behavior of Mg-Gd-Y Alloy
INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION(2012)
摘要
Magnesium alloy is very attractive in many industrial applications due to its low density. The structure-property relationships
of the magnesium alloy under quasi-static loading have been extensively investigated. However, the dynamic behavior, particularly
the mechanism of high-rate plastic deformation, of the magnesium alloy requires more in-depth investigations. In this paper,
the effect of aging treatment on the quasi-static and dynamic properties of a typical rare earth Mg-Gd-Y magnesium alloy is
investigated. In particular, the plastic deformation mechanism under dynamic compression loading is discussed. Split Hopkinson
Pressure Bar (SHPB) was used to carry out dynamic compression tests with controllable plastic deformation by using stopper
rings. The experimental results demonstrate that both static and dynamic properties of the Mg-Gd-Y alloy vary under various
aging treatment conditions (under-aged, peak-aged and over-aged conditions), due to two different kinds of second phases:
remnant micro size phase from solid solution treatment and nano precipitation from aging treatment. The results of microstructure
characterization and statistic analysis of the metallographic phase are presented. The area fraction of the twinned grains
increases due to aging treatment and dynamic loading. The main plastic deformation mechanism of the rare earth Mg-Gd-Y magnesium
alloy is dislocation slip, rather than twinning for the conventional AZ31 magnesium alloy under high strain rate loading.
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关键词
aging treatment,dynamic behavior,mg-gd-y alloy
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