采用真空感应熔炼制备Al-6Mg-0.4Mn-0.2Sc-0.1Zr-0.1Cr(质量分数,%)合金,研究了冷变形态合金分别在350, 400, 450和500℃退火1 h后微观组织和力学性能的变化.TEM观察表明, 冷变形态的合金组织为交错缠结的位错胞经过350℃退火后位错在晶界规律排列, 密度大大降低, 发生回复, 晶粒保持在500 nm以下.在400-500℃的退火过程中再结晶过程缓慢进行.由于Al3(Sc, Zr)相的Zener 拖曳作用, 合金的再结晶温度区间宽化. 力学性能在350℃退火时发生明显变化,随退火温度的进一步升高变化不明显.
Al-6Mg-0.4Mn-0.2Sc-0.1Zr-0.1Cr(mass fraction, %) alloy was prepared by vacuum induction melting, and the microstructures and mechanical properties of cold worked samples annealed at 350, 400, 450 and 500℃ for 1 h were investigated. TEM observation indicated that tangled dislocation cells are typical microstructure in cold worked sample; After 350℃ annealing, the dislocations arrange regularly and the density decreases sharply, the alloy recovers partly and the grain size is about 500 nm; Further annealing to 500℃, recrystallization proceeds gradually in a wide temperature range due to the Zener drag effect of Al3(Sc, Zr) phase . As a result, the mechanical property changes greatly at 350℃ but keeps steady with further temperature increasing.
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