CAJ | 학술논문

采用机械搅拌和超声分散相结合的方法制备出了纳米SiC颗粒增强ADC12铝合金基复合材料,并对制备出的复合材料进行微观结构分析和力学性能测试.结果表明,与基体合金相比,当纳米SiC颗粒的含量为2.0%时,所制得的复合材料的抗拉强度、弹性模量、断面收缩率及硬度分别提高23%、43%、160%和7.4%.用扫描电镜对试样拉伸断口的形貌和SiC颗粒的分散情况进行观察,发现纳米SiC颗粒在基体内呈均匀的弥散分布,没有发现大的团聚.同时,纳米SiC颗粒的均匀分布起到了阻碍或者阻止裂纹产生和扩展的作用.
채용궤계교반화초성분산상결합적방법제비출료납미SiC과립증강ADC12려합금기복합재료,병대제비출적복합재료진행미관결구분석화역학성능측시.결과표명,여기체합금상비,당납미SiC과립적함량위2.0%시,소제득적복합재료적항랍강도、탄성모량、단면수축솔급경도분별제고23%、43%、160%화7.4%.용소묘전경대시양랍신단구적형모화SiC과립적분산정황진행관찰,발현납미SiC과립재기체내정균균적미산분포,몰유발현대적단취.동시,납미SiC과립적균균분포기도료조애혹자조지렬문산생화확전적작용.
Nano-sized SiC particles reinforced aluminum matrix composites were fabricated by mechanical stirring and high-intensity ultrasonic method, and mechanical properties and microstructure of the prepared composites were investigated. The results reveal that compared with those of ADC matrix alloy, the tensile strength, elastic modulus, reduction of area and hardness of the composites are improved by 23%, 43%, 160% and by 7.4%, respectively, with 2.0% SiC reinforcement in weight percent. The tensile fracture morphology and distribution of SiC particles in the composites were observed by SEM (scanning electron microscope). It is found that SiC particle is uniformly and dispersedly distributed in the matrix alloy with absence of large cluster. Meanwhile, uniform distribution of nano-sized SiC particle plays the role in inhibiting or restraining the creation and propagation of crack in the composites.