颗粒体积分数对高压扭转的SiCp/Al基复合材料拉伸性能影响  

EFFECT OF VOLUME FRACTION ON TENSILE PROPERTIES OF SiCp/Al ALLOY COMPOSITES BY HIGH-PRESSURE TORSION

作　　者：石文超[1] 李萍[1] 李晓[1] 薛克敏[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《粉末冶金工业》2013年第1期46-51,共6页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(51175138);安徽省优秀青年科技基金资助项目(10040606Y21);高等学校博士学科点专项基金资助项目(20100111110003)

摘　　要：基于高压扭转法制备SiCp/Al基复合材料,采用金相显微镜、室温拉伸性能测试实验并结合断口扫描电镜观察,研究颗粒体积分数对SiCp/Al基复合材料的显微组织和拉伸性能的影响。结果表明:SiC颗粒体积分数越大,剪切应变量越小,SiC颗粒分布越不均匀,团聚越严重。试样抗拉强度和屈服强度随SiC颗粒体积分数的增加而增加,但塑性降低。拉伸断口韧窝尺寸大小不一。高压扭转的SiCp/Al基复合材料断裂属于韧性断裂与脆性断裂混合模式,但随着SiC体积分数越小,材料断口的韧窝和撕裂棱越多,韧性断裂特征变得更为显著。SiCp/Al composites were fabricated by High-Pressure Torsion. The effect of the volume fraction on microstructure and tensile properties of the composites was studied by means of microscope, tensile test and SEM observation of fracture surfaces. The results show that the volume fraction and the shear strain influence the distribution of SiC particles. The higher particle volume fraction, the lower shear strain, the less homogeneous of the dis- tribution and the more clusters of SiC particles. With the volume fraction increasing, the tensile strength and yield strength increase, but the ductility decreases. Tensile fracture surface exist various sizes of dimples. The failure of SiCp/Al composites is of mixed mode of gliding fracture and brittle fracture. With the volume fraction of SiCp/Al composites decreasing, fracture dimples and tearing edges increase, the features of gliding fracture get more dominant.

关 键 词：高压扭转 SICP AL基复合材料 显微组织 拉伸性能 

分 类 号：TB333[一般工业技术—材料科学与工程]