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在Al－0．35Sc合金中加入不同含量的微量过渡族元素Zr，Ti，采用正交实验测定了这些合Zr，Ti元素的Al－0．35Sc合金的高温（270℃）力学性能．研究了Zr，Ti加入量、时效温度、时间对合金的高温力学性能的影响．并应用透射电镜，观察了微观组织，分析高温强化机理，观察表明，加入Zr，Ti的合金中第二相粒子细小．270℃温度条件下，Al－0．35SC－Zr－Ti合金的高温力学性能高于Al－0．35Sc合金．高温状态下，共格强化、亚晶强化、晶界强化三种机理共同起作用．
In the Al-0.35Sc alloy, Zr and Ti with different contents were added into the Al-0.35Sc alloy. The mechanical properties of Al-0.35Sc alloy with Zr and Ti elements at 270 ℃ were investigated by orthogonal experiments. The effects of Zr and Ti addition, aging temperature and time on the mechanical properties of the alloy were investigated. The microstructure was observed by transmission electron microscopy. The mechanism of high temperature strengthening was analyzed. The results showed that the second phase particles in the alloy containing Zr and Ti were fine. The mechanical properties of Al-0.35SC-Zr-Ti alloy at 270 ℃ are higher than that of Al-0.35Sc alloy at high temperature. Under the condition of high temperature, the three mechanisms of coherent strengthening, subgrain strengthening and grain boundary strengthening work together.