(1.南京航空航天大學(xué) 無人機研究院, 南京 210016;
2.東南大學(xué) 材料科學(xué)與工程系, 南京 210096)
摘 要: 在高應(yīng)變速率超塑性變形過程中，SiC(10%)/MB2復(fù)合材料內(nèi)部有空洞生成。對不同應(yīng)變量拉伸試樣軸剖面上的空洞進行觀察，結(jié)果表明：空洞量隨應(yīng)變量的增加而增加，并且與顆粒的尺寸大小密切相關(guān)，其生長服從指數(shù)定律。
關(guān)鍵字: 鎂合金；復(fù)合材料；超塑性；空洞
matrix composites during high strain
rates uperplasticity deformation
MA Ai-bin2, LÜ Qing-feng1
（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
