利用光学金相、扫描电镜、透射电镜、硬度和差热分析等研究了7N01铝合金在120℃下时效性能变化与析出演变情况。结果表明：7N01强化元素充分固溶处理后,难溶的Fe、Mn元素等与Al、Si等形成了棒状α-Al（FeMn）Si相,时效过程中,α-Al（FeMn）Si吸附并溶解基体析出的Mg、Zn等元素,形成α-Al（FeMnMgZn）Si。合金在120℃下时效,随着时效时间的延长,硬度不断上升,并在时效48 h后达到第一个硬度峰值,峰值硬度为138 VHN,继续时效,硬度开始稍有下降,时效到72 h后硬度又缓慢上升,直至时效到96 h时,7N01硬度达到第二个峰值,峰值硬度为146 VHN。硬度变化本质上反映了120℃时效过程中强化相从GPⅡ到η＇相转变。
Properties and precipitation behaviour of 7N01 aluminium alloy aged at 120 ℃ was investigated by means of OM,SEM,TEM,DSC and hardness test.The results show that Fe and Mn which are insoluble in 7N01 alloy form rod-shape α-Al（FeMn） Si phase after solution treatment,and Mg and Zn elements in Al-matrix are dissolved into α-Al（FeMn）Si to form α-Al（FeMnMgZn）Si phase during aging at 120 ℃.Hardness of the alloy gradually increases with prolonging aging time and reaches the first hardness peak at 48 h,which is 138 VHN.Hardness decreases slightly when aging between 48 h and 72 h,and then slowly increases again with further increase of aging time to the second hardness peak at 96 h,which is 146 VHN.The changes of hardness are ascribed to the transformation of GPⅡ to η′ phase in 7N01 aluminium alloy during aging.
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