(1.南京航空航天大学 无人机研究院, 南京 210016;
2.东南大学 材料科学与工程系, 南京 210096)
摘 要: 在高应变速率超塑性变形过程中，SiC(10%)/MB2复合材料内部有空洞生成。对不同应变量拉伸试样轴剖面上的空洞进行观察，结果表明：空洞量随应变量的增加而增加，并且与颗粒的尺寸大小密切相关，其生长服从指数定律。
关键字: 镁合金；复合材料；超塑性；空洞
matrix composites during high strain
rates uperplasticity deformation
（1.Research Institute of Unmanned Aircraft,
Nanjing University of Aeronautics and Astronautics，
Nanjing 210016, China;
2.Department of Materials Science and Engineering，
Southeast University，Nanjing 210096,China）
Abstract:Longitudinal sections of superplastically defor med magnesium matrix composites reinforced with 10%(volume fraction) SiC particulate were observed by TEM and SEM. Large amount of cavity has formed during the superplasticity deformation.Volume fraction of cavities increases with true strain during superplastic deformation.Cavity nucleates at the interface of particulate and matrix，and it is related to particulate size.Cavity growth rate obeys the exponential law.
Key words: magnesium alloy;composite;superplasticity; cavity
