摘要
采用粉末冶金法制备了亚微米SiC_p增强Al基复合材料,通过扫描电镜(SEM)观察复合材料的微观结构。结果表明,随着亚微米SiC_p的体积分数增加,Al基复合材料的相对密度减小,硬度和摩擦因数增大,抗拉强度先增大后减小,同时复合材料的磨损量先减小后增大。当亚微米SiC_p的体积分数为6.0%时,Al基复合材料具有最大的抗拉强度,磨损量较小。当添加少量亚微米SiC_p时,由于SiC_p本身具有较高的硬度和强度,可承受一定的载荷,对晶界的滑移具有阻碍作用,从而通过颗粒强化作用提高Al基复合材料的力学性能和磨损性能。
Submicron SiC particle reinforced Al matrix composites was fabricated by powder metallurgy method.The microstructure of the as-prepared composites was observed by scanning electronic microscopy（SEM）,and the mechanical properties were characterized by tensile testing and Brinell hardness test.The results reveal that with increasing in the volumetric fraction of SiC submicron particles,the relative density of Al-matrix composites is decreased,and hardness and frictional coefficient are increased,while tensile strength and the wear rate of the composites are increased firstly and then decreased.When the volumetric fraction of SiC submicron particles is 6.0%,tensile strength of the composites prepared reaches the maximum value with low wear rate.When SiC submicron particles were added into the aluminum matrix composites,due to its high hardness and strength bearing to certain loading to hinder the sliding of the grain boundaries,mechanical properties and wear resistance of Al matrix composites were improved.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第4期411-414,共4页
Special Casting & Nonferrous Alloys
基金
湖北省教育厅科学技术重点资助项目(D20141801)
