采用硬度测试、拉伸性能测试、晶间腐蚀试验和透射电镜等手段,研究了双级时效工艺对Al-Mg-Si合金的力学性能及耐晶间腐蚀性能的影响.结果表明,Al-Mg-Si合金在T6态时具有良好的综合力学性能,此时对应的硬度为114 HB,抗拉强度和屈服强度分别为445.67和423.75 MPa,断后伸长率为11.75％,晶间腐蚀深度为345 μm.在此基础上对该合金进行双级时效处理后,合金仍具有较好的力学性能,且腐蚀深度明显变浅,最佳双级时效工艺为T6+(150℃/2 h).
Effect of two-step aging treatment on mechanical properties and resistance to intergranular corrosion of Al-Mg-Si aluminum alloy were investigated by hardness test,tensile test,intergranular corrosion test and TEM observation.The experimental results showed that the Al-Mg-Si alloy in T6 temper condition had as excellent mechanical properties as hardness of 114 HB,tensile strength of 445.67 MPa,yield strength of 423.75 MPa,and elongation of 11.75％.In addition,the intergranular corrosion depth was 345 μm.After two-step aging treatment,the alloy still had good mechanical properties while the depth of corrosion reduced obviously.As a result,the optimum two-step aging treatment was T6 + (150 ℃/2 h).
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