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通过常温拉伸、晶间腐蚀、慢应变速率应力腐蚀等试验,并结合电子显微观察,研究常规固溶后在不同温度下高温预析出处理对7005铝合金力学性能、腐蚀行为及显微组织的影响。结果表明:合金的维氏硬度随着预析出温度的降低而逐渐下降,而电导率则呈现出相反的变化趋势,并以此选择440和420°C进行预析出对比研究。高温预析出能显著增加晶界粗大析出相的不连续分布程度,且随着预析出温度的降低,晶界析出相的粗化和不连续程度增加,致使合金抗晶间腐蚀和应力腐蚀性能得到显著提高,而强度略有下降。
Through tensile test, intergranular corrosion test and slow strain rate stress corrosion test, the mechanical properties, corrosion behavior and microstructure of 7005 aluminum alloy subjected to high temperature pre-precipitation at different temperatures after conventional solution treatment were investigated by electron microscopy. Impact. The results show that the Vickers hardness of the alloy decreases gradually with the decrease of the pre-precipitation temperature, while the conductivity shows the opposite trend. Based on this, 440 and 420 ° C pre-precipitation comparison studies are conducted. High temperature pre-precipitation can significantly increase the degree of discontinuous distribution of coarse precipitates in the grain boundary. With the decrease of pre-precipitation temperature, the coarsening and discontinuity of precipitated phases in the grain boundary increase, resulting in the intergranular corrosion resistance and stress corrosion resistance Significantly increased, while intensity decreased slightly.