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采用拉伸测试、电导率测试和透射电镜等手段研究了双级时效制度对7150铝合金的力学性能、电导率和微观组织的影响。结果表明:在本研究范围内,第一级时效制度对合金的力学性能和电导率影响不大;合金经过120℃/8h+160℃/6h,可以达到与单级峰时效处理相当的抗拉强度,并且电导率有明显提高;第二级时效温度为168℃时效时,相比在160℃进行第二级时效,合金在具有同等电导率水平时,损失的强度相对较多,但时效时间明显变短;120℃/8h+160℃/32h双级时效后,合金的抗拉强度为560MPa,屈服强度为520MPa,延伸率为11.5%,电导率22.7MS.m-1,晶内沉淀析出相以η′和η为主,晶界析出相完全断开。
Tensile test, conductivity test and transmission electron microscopy were used to study the effects of two-stage aging on the mechanical properties, electrical conductivity and microstructure of 7150 aluminum alloy. The results show that within the scope of this study, the first-stage aging system has little effect on the mechanical properties and electrical conductivity of the alloy. The tensile strength of the alloy reaches to that of the single-stage peak aging treatment after 120 ℃ / 8h + 160 ℃ / 6h Strength and conductivity were significantly improved. When the second aging temperature was 168 ℃, compared with the second-stage aging at 160 ℃, the strength of loss was relatively high when the alloy had the same conductivity, but the aging time The tensile strength of the alloy is 560MPa, the yield strength is 520MPa, the elongation is 11.5%, the conductivity is 22.7MS.m-1, and the precipitate in the crystal is precipitated Phase η ’and η-based, grain boundary precipitates completely disconnected.