高比例SiC_p/Al复合材料热循环累积残余应变

Cumulative Residual Strain for High Volume SiC_p/Al Composite in Thermal Cycle

研究了高比例大尺寸SiCp/Al复合材料于不同颗粒尺寸、基体、预处理类型及热循环次数情况下在热循环过程中的累积残余应变(εcr)。结果表明:(1)复合材料相对基体具有更小的εcr,并随着增强颗粒尺寸变大,其εcr逐渐变小;(2)通过选择合适的基体及加入适当量合金元素可以获得具有较低εcr的高比例颗粒增强铝基复合材料;(3)适当的预处理可以显著降低材料的εcr,从而提高其尺寸稳定性;(4)随着热循环次数的增加,复合材料的εcr趋于平稳。

Under the condition of different particle dimension, different matrix, different preheat treatment and different thermal cycling times, cumulative residual strain ε_(cr) of high volume SiC_p/Al composites was studied during the course of thermal cycle. The results show: (1) SiC_p/Al composites had smaller ε_(cr) than matrix, and the larger the dimension of particle, the smaller the ε_(cr). (2) By collecting appropriate matrix and joining in suitable quantity alloy element, high volume SiC_p/Al composites with the smaller ε_(cr).could be acquired. (3) Proper preheat treatment could apparently lower the ε_(cr) of SiC_p/Al composites, thus improving its dimensional stability. (4) With the increase of thermal cycling times, the ε_(cr) of SiC_p/Al composites tended to be stable.