不同退火制度对Al-Mg-Sc合金组织与性能的影响

Effects of different annealing systems on microstructure and properties of Al-Mg-Sc alloy

通过拉伸力学性能、剥落腐蚀、晶间腐蚀测试及显微组织分析,研究了不同退火制度对Al-Mg-Sc合金组织及性能的影响,并探讨其作用机制。结果表明,添加微量的Sc、Zr元素能显著改善Al-Mg合金的力学性能,合金退火过程中的再结晶行为受到强烈阻碍;合金经300℃/2 h退火后能获得最佳强塑性和耐腐蚀性能,纵向力学性能σb=412 MPa、σ0.2=328MPa、δ=14.0%,横向力学性能σb=424 MPa、σ0.2=333 MPa、δ=21.0%,剥落腐蚀级别PB,晶间腐蚀重量损失量3 mg/cm~2。

The effects of different annealing regimes on the microstructure and properties of Al-Mg-Sc alloys were studied by tensile mechanical properties, exfoliation corrosion, intergranular corrosion and microstructure analysis, and the mechanism was also discussed. The results show that the mechanical properties of Al-Mg alloy can be significantly improved by adding trace elements Sc and Zr, and the recrystallization behavior of Al-Mg alloy is strongly hindered during the annealing process. After annealing at 300℃/2h,the alloy can obtain the best strong plasticity and corrosion resistance. The longitudinal mechanical properties of the alloy are σb =412MPa, σ0.2= 328MPa, δ=14.0%, the transverse mechanical properties are σb =424MPa, σ0.2=333 MPa, δ=21.0%, and the exfoliation corrosion grade is PB, intergranular corrosion weight loss is 3mg/cm~2.