SiC颗粒增强铝合金基梯度复合材料弯曲力学性能及其评价  

BENDING MECHANICAL PROPERTIES AND ITS EVALUATION OF ALUMINIUM ALLOY MATRIX GRADIENT COMPOSITES REINFORCED WITH SiC PARTICLES

作　　者：郭成[1] 郭生武[1] 程羽 张新功[1] 史东才[1] 

机构地区：[1]西安交通大学机械工程学院,西安710049

出　　处：《复合材料学报》2002年第6期57-60,共4页Acta Materiae Compositae Sinica

基　　金：西安交通大学在职博士基金资助

摘　　要：　采用三点弯曲法,对SiC颗粒增强铝合金基梯度复合材料的弯曲力学性能进行了研究,提出了梯度复合材料抗弯强度比R1和R2两个新的力学性能评价指标。结果表明:金属基梯度复合材料(MMGC)的弯曲力学性能与其基本组分力学性能的关系不符合ROM法则,材料的抗弯强度和最大挠度强烈地受到SiC颗粒梯度分布方式与弯曲方向的影响;当基体处于受拉侧,高SiC含量组分处于受压侧时,MMGC能充分发挥其性能优势;MMGC在受梯度应力作用下的力学性能优势和其方向性特征受到材料状态、材料宏观不均匀性和微观连续性等因素的影响;MMGC的抗弯强度比R1反映了这类材料的性能优势,而抗弯强度比R2则反映了材料的方向性能特征。The bending mechanical properties of aluminium alloy matrix gradient composites reinforced with SiC particles were studied using a bending test under threepoint loading. The bending strength ratios R1 and R2 of the composites were put forward. The results show that the bending mechanical properties of the Metal Matrix Gradient Composites (MMGC) do not obey the Role of Mixture (ROM) law. The bending strength is remarkably influenced by the distribution way of SiC particles and bending direction. The MMGC can develop their full potential in bending properties when the matrix component is laid at the tensile side and the component with high SiC volume fraction at the compressive side. The potential of mechanical properties and the oriented features of the MMGC by the action of gradient stress are influenced by many factors such as the state, the macrouniformity and the microcontinuity of materials. The bending strength ratios R1 and R2 can be used to justify the bending properties and the orientation of the composites.

关 键 词：SIC 颗粒增强铝合金基梯度复合材料 评价 弯曲力学性能 碳化硅 

分 类 号：TB333[一般工业技术—材料科学与工程]