Effect of Annealing Temperature on Microstructure and Mechanical Properties of Cold Rolling Sheet for LA103Z Magnesium Lithium Alloy
The cold rolling sheet for LA103Z magnesium lithium alloy with thickness of 1 mm was prepared by vacuum induction melting,annealing,forging and cold rolling,and the microstructure and mechanical properties of different annealing processes were stud-ied by metallographic analysis and room temperature tensile analysis.The results show that the structure of LA103Z consists of α-Mg phase as strengthening phase and β-Li phase as matrix structure.The α phase is distributed fiber-like along the rolling direction.The unstable microstructure of alloy will recrystallize under the interaction of internal energy storage and external kinetic energy when the annealing temperature increased.As a result,the morphology of α phase gradually changed from fibrous to short strip and fine mass.After annealing at 200 ℃,α phase changes to fine spot distribution,and then grows with the increase of annealing temperature.The ten-sile strength and yield strength will decrease gradually when the annealing temperature increased,but the elongation will increase.
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