摘要
通过光学显微镜、扫描电镜、室温力学性能及电化学腐蚀测试,研究固溶时间对Al-8.54Zn-2.41MgxCu(x=2.2,1.3)超强铝合金组织与性能的影响。结果表明,固溶时间延长,合金基体中残余结晶相的数量显著减少,再结晶体积分数增加,电化学腐蚀电位正移。固溶时间为60 min时,Cu=1.3%(质量分数)合金的强度和抗腐蚀性能均高于Cu=2.2%合金。当固溶时间延长至180 min时,Cu=2.2%合金的抗拉强度和屈服强度略有提高,Cu=1.3%合金强度降低;高铜含量合金剥落腐蚀程度减少,低铜合金剥落腐蚀程度增加,且高铜合金的抗腐蚀性能高于低铜合金。适当缩短固溶时间,能够提高低铜合金的强度和抗腐蚀性能。在相同的固溶条件下,2种合金的电化学腐蚀电位相差不大。
The effects of solution treatment on the microstructures and properties of Al-8.54Zn-2.41Mg-xCu alloys was studied by OM, SEM, room temperature tensile test and electrochemical corrosion test. The results show that the amount of residual phases decreases rapidly, the volume fraction of recrystallization increases and the polarization curves move to positive direction with increasing solution time. When the solution time is 60 min, the strength and the resistance to corrosion of the alloy with 1.3%（mass fraction）copper content are better than those of the alloy with 2.2%copper content. When the solution time increases to 180 min, the tensile strength and yield strength of the alloy with 2.2%copper content increase slightly and those of the another alloy decrease;the exfoliation corrosion degree of the alloy with 1.3%copper is higher than that of the alloy with 2.2%copper content, and its resistance to corrosion is better than the alloy with lower copper content. It is also found that appropriately decreasing the solution time can improve the strength and the corrosion resistance of the alloy with low copper content. The corrosion potential of the alloys has little difference, when copper content is lowered within a certain range.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2014年第3期373-379,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家基础研究计划项目(2012CB619502)
(2010CB731701)
国家自然科学基金委员会创新研究群体科学基金资助项目(51021063)
