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对含微量Er的A l-4.5Mg-0.7Mn-0.1Zr合金在150℃时的力学性能进行测定,并通过扫描电镜、X射线衍射以及透射电镜对合金的微观组织进行分析,结果发现微量的Er可以在保持试验合金的延伸率基本不变的情况下,显著提高合金的高温力学性能。这是由于Er在试验合金中形成了纳米级的且与基体共格的A l3Er粒子,A l3Er粒子在试验温度下不聚集、不长大,具有很高的高温稳定性,通过阻碍位错运动抑制试验合金的再结晶过程并提高其高温力学性能。
The mechanical properties of Al-4.5Mg-0.7Mn-0.1Zr alloy with a trace amount of Er at 150 ℃ were investigated. The microstructure of the alloy was analyzed by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. Er can significantly improve the mechanical properties of the alloy at high temperature while keeping the elongation of the test alloy substantially unchanged. This is due to the formation of Er in the experimental alloy nano-level and the matrix A l3Er particles, A l3Er particles at the experimental temperature does not aggregate, does not grow, with high high temperature stability, by blocking dislocation movement Inhibit the recrystallization process of the test alloy and improve its high-temperature mechanical properties.