| Summary: | 碩士 === 國立東華大學 === 材料科學與工程學系 === 99 === The alloy design and aging treatment are used to strengthen the Mg-Li alloys. Based on the Mg-Li-Al-Zn alloy composition, by changing the different amount of Al and Sc addition. On LAZ1141+0.1 wt% Sc and LAZ1191+0.2 wt% Sc alloys were cold work and the natural aging process, and used in the experiment rolling machine, OM, Vickers hardness, tensile testing machine and other equipment to complete the necessary and observation of process produced by the process of microstructure and mechanical properties of the changes.
Experimental results show that, both materials can be strengthen by cold rolling, and in 20% of cold rolling, the yield and tensile strength are the most obvious effect of elevated. If lend a greater processing capacity with LAZ1141+0.1 wt% Sc, its strength has not improved but the elongation will be gradually increased. In addition, we find the α-phase in LAZ1191+0.2wt%Sc more bigger than LAZ1141+0.1wt%Sc, so the yield and tensile strength performance are also more outstanding. Through the cold-rolling can make LAZ1141+0.1 wt% Sc and LAZ1191+0.2 wt% Sc hardness increase, and after cold-working, by the natural aging of the peak aging from the second hour to the fourth hour to appear, in that case, speculated that cold-working of this material has the effect of inhibiting precipitation.
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