SiC晶须增强Al－2．0％Li合金的拉伸性能

TENSILE PROPERTIES OF Al 2 0%Li ALLOY REINFORED BY SiC WHISKERS

研究了压力铸造法制备的ＳｉＣ晶须增强Ａｌ－Ｌｉ合金的时效硬化行为与拉伸性能．结果表明，ＳｉＣ晶须的引入不仅可以加速δ′相的长大，使时效峰提前，而且ＳｉＣ晶须的加入还明显提高Ａｌ－Ｌｉ合金的强度，而拉伸延伸率降低较少；ＳｉＣｗ／Ａｌ－Ｌｉ复合材料的拉伸断口呈穿晶韧窝状。

The behavior of aging hardening and tensile properties of Al Li alloy reinfored by SiC whiskers are studied. The results show that the whiskers not only accelerate the growth of δ ′ phase, leading to the preceding of peak aging, but also obviously enhance the strength, and cause a little decrease in elongation. Tensile fracture of the SiCw/Al Li composite is in the transgranular dimple type. The fracture mode does not change from transgranular to intergranular with aging time, which always exists in Al Li alloys.