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利用熔铸技术制备了原位自生Al2O3-TiC/Al复合材料。借助SEM、TEM和高温材料实验机等,对工业纯铝和Al2O3-TiC/Al复合材料的高温变形行为进行较为深入的探讨。结果表明,实验材料的流变应力随压缩变形温度的升高而下降,高的应变速率将提高流变应力的整体水平;工业纯铝在523~723K、Al2O3-TiC/Al复合材料在523K-623K温度区间的压缩变形以晶内位错运动为主要特征;在623~723K温度区间,Al2O3-TiC/Al复合材料的压缩变形以晶内位错运动以及晶界的滑移为主要特征。
In-situ self-Al 2 O 3 -TiC / Al composites were prepared by casting technique. With the help of SEM, TEM and high-temperature materials testing machine, the high-temperature deformation behavior of industrial pure aluminum and Al2O3-TiC / Al composites were discussed in more depth. The results show that the flow stress of the experimental material decreases with the increase of the compressive deformation temperature, and the high strain rate will increase the overall level of the flow stress. At the temperature of 523-723 K, the Al2O3-TiC / In the temperature range of 623K to 723K, the compressive deformation of the Al2O3-TiC / Al composites is mainly characterized by intra-grain dislocation movement and grain boundary slippage.