6106汽车用铝合金型材双级时效工艺的研究

Study on Two-Stage Aging Process of 6106 Aluminum Alloy Profile for Automobile

利用力学性能测试、电导率、晶间腐蚀等试验手段,研究双级时效工艺对6106铝合金性能的影响。结果表明,在一级时效固定情况下,随着二级时效时间的延长,6106合金的屈服强度、抗拉强度升高,断后延伸率下降,在120℃×2h+185℃×3h双级时效下的强度和延伸率与单级峰时效制度的更相近;6106合金的电导率随着温度升高、时间延长而增加,但数值相差较小,与晶间腐蚀程度趋势相同。在120℃×2h+185℃×3h双级时效下的电导率最大,远高于单级峰时效制度的电导率。综合以上,120℃×2h+185℃×3h双级时效制度可以代替单级峰时效制度。

In this paper,the effect of two-stage aging process on the properties of 6106 aluminum alloy is studied by means of mechanical property test,conductivity test and intergranular corrosion test.The results show that the yield strength and tensile strength of 6106 alloy increase and the elongation after fracture decrease with the increase of the second aging time.The strength and elongation of 6106 alloy aged at 120℃×2h+185℃×3h are closer to those of single peak aging;The conductivity of 6106 alloy increases with the increase of temperature and time,but the difference is small,and the trend is the same with the degree of intergranular corrosion.The results show that the conductivity is the highest at 120℃×2h+185℃×3h,which is much higher than that of single-stage peak aging.In conclusion,the two-stage aging system of 120℃×2h+185℃×3h can replace the single-stage peak aging system.