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选取铸态和均匀化态两种不同状态AZ80镁合金作为变形前试样,在温度T=390℃、变形速率ν=2mm·s-1以及应变ε=1.6的条件下进行压缩变形实验,研究了两种不同初始状态对变形组织及性能的影响。结果表明,铸态试样变形后原晶界和枝晶界处粗大β相被压缩破碎且呈流线集中分布,动态再结晶主要发生在晶界和枝晶界附近。均匀化试样经变形后仍残留有原始粗晶,但动态再结晶比例明显高于铸态直接变形;所有试样变形后力学性能均高于初始铸锭,同时由于均匀化变形后晶粒细化比例高,其力学性能优于铸态直接变形。相比铸锭,铸态直接变形伸长率提高不明显,而抗拉强度和硬度分别提高到原来的1.8和1.5倍,因此旨在提高强度和硬度的铸态直接变形是可行的。
Two different states AZ80 magnesium alloy, as-cast and homogenized, were selected as pre-deformation specimens. The specimens were subjected to compression deformation under the conditions of T = 390 ℃, deformation rate ν = 2mm · s-1 and strain ε = 1.6. The effect of two different initial states on the microstructure and properties of the deformation was investigated. The results show that the coarse β phase in the original and dendrite boundaries is crushed and concentrated in streamline distribution after deformation, and the dynamic recrystallization mainly occurs near the grain boundaries and dendritic boundaries. The homogenized samples still have the original coarse grains after the deformation, but the dynamic recrystallization proportion is obviously higher than the direct deformation of the as-cast specimens. The mechanical properties of all samples after deformation are higher than that of the original ones. At the same time, High proportion of its mechanical properties better than the direct deformation of the cast. Compared with the ingot, the direct deformation of the as-cast elongation increases insignificantly, while the tensile strength and hardness are increased to 1.8 and 1.5 times respectively. Therefore, the direct as-cast deformation aimed at improving the strength and hardness is feasible.