The hot deformation behaviors of the bimodal carbon nanotube reinforced 2009Al (CNT/2009Al) composite were studied by establishing processing map and characterizing the microstructure evolution. The results indicate that the grain size in the ultra-fine grained zones was stable during hot deformation, while the coarse grained zones were elongated with their long axis directions tending to be perpendicular to the compression direction. Low temperature with high strain rate (LTHR), as well as high temperature with low strain rate (HTLR) could increase the length/width ratio of the coarse grained zones. However, LTHR and HTLR could cause the instable deformation. The instable deformation at LTHR was induced by severe intragranular plastic deformation and the localized shear crack, while the instable deformation at HTLR resulted from the more deformation component at the coarse grained zones, and the micro-pore initiation due to CNT re-agglomeration at the boundaries between the coarse and the ultra-fine grained zones.

通过建立加工图和表征组织演变，研究了双峰碳纳米管增强2009Al（CNT / 2009Al）复合材料的热变形行为。结果表明，在热变形过程中，超细晶粒区的晶粒尺寸是稳定的，而粗晶粒区则被拉长，其长轴方向趋于垂直于压缩方向。高应变速率的低温（LTHR）和低应变速率的高温（HTLR）可能会增加粗粒区域的长宽比。但是，LTHR和HTLR可能会导致不稳定的变形。LTHR的不稳定变形是由严重的颗粒内塑性变形和局部剪切裂纹引起的，