SiC晶须增强Al－2.0%Li合金的拉伸性能

来源期刊：中南大学学报(自然科学版)1996年第5期

论文作者：陈仕奇

文章页码：62 - 65

关键词：SiC晶须; Al－Li合金; 拉伸性能

Key words：SiC whisker; Al-Li alloy; tensile property

摘    要：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,不存在通常Al－Li合金中因时效引起的断口形貌由穿晶型向沿晶型过渡的现象.

Abstract: 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.