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为研究长周期堆垛有序(LPSO)结构对镁合金腐蚀行为的影响,通过重力铸造制备了Mg-6.6Y-2.6Cu-1.2Zr(质量分数%)合金,并分别在420、440和460℃下固溶处理。借助SEM和XRD对合金显微组织和物相进行分析;通过腐蚀浸泡实验研究合金的耐蚀性能。结果表明,铸态Mg-6.6Y-2.6Cu-1.2Zr含有LPSO结构,随着固溶温度的升高,LPSO结构减少,晶粒尺寸增大,当固溶温度为460℃时,LPSO结构消失。不含LPSO结构的Mg-Y-Cu-Zr合金耐蚀性能优于含LPSO结构的该合金,而随着固溶温度的升高,含有LPSO结构的Mg-Y-Cu-Zr合金的耐蚀性能降低。此外,合金表现为严重的局部腐蚀行为。
In order to study the effect of LPSO structure on the corrosion behavior of magnesium alloy, Mg-6.6Y-2.6Cu-1.2Zr (mass fraction) alloy was prepared by gravity casting, ℃ solution treatment. The microstructure and phase of the alloy were analyzed by SEM and XRD. The corrosion resistance of the alloy was studied by corrosion immersion test. The results show that LPSO structure is contained in as-cast Mg-6.6Y-2.6Cu-1.2Zr, the LPSO structure decreases and the grain size increases with the increase of solution temperature. When the solution temperature is 460 ℃, the LPSO structure disappears . The corrosion resistance of Mg-Y-Cu-Zr alloy without LPSO structure is superior to that of LPSO-containing alloy. With the increase of solution temperature, the corrosion resistance of Mg-Y-Cu-Zr alloy with LPSO structure Decreased performance. In addition, the alloy shows serious localized corrosion behavior.