深冷处理对5083Al-Mg合金组织和性能的影响

Effect of cryogenic treatment on microstructure and properties of 5083Al-Mg alloy

试验研究了深冷处理时间对5083Al-Mg合金力学性能和硬度的影响。研究表明,5083Al-Mg合金的抗拉强度在0~72 h范围,随着深冷处理时间的增加而增大;深冷处理时间过长,对于进一步改善合金的抗拉强度反而不利。综合分析试验结果揭示,深冷处理改善合金力学性能的较佳处理时间为12~24 h。合金提高强度和硬度的机理是,在深冷处理过程中,合金基体组织发生晶格畸变、位错增殖和缠绕,同时伴随Al_(3)Mg_(2)相弥散析出。

Effect of cryogenic treatment time on tensile properties and hardness of 5083Al-Mg alloy was studied.The results show that the tensile strength of the 5083Al-Mg alloy increases with prolong of the cryogenic treatment time within 0-72 h.It is unfavorable to further improve the tensile strength of the alloy by excessively extending the cryogenic treatment time.Comprehensive analysis of the experimental results reveal that the preferable cryogenic treatment time is 12-24 h to improve mechanical properties of the alloy.The mechanism of improving the strength and hardness of the alloy is that the lattice distortion,dislocation multiplication and twine occur in the process of cryogenic treatment,accompanied by the dispersed precipitation of Al_(3)Mg_(2) phase.