CAJ | 학술논문

采用压力浸渗法制备Si3N4体积分数分别为45％、50％和55％的颗粒增强铝基复合材料(Si3N4/Al).研究Si3N4体积分数和T6热处理对Si3N4/Al复合材料微观组织和力学性能的影响.结果表明:Si3N4颗粒分散均匀,Si3N4/Al复合材料浸渗良好,没有明显的孔洞和铸造缺陷；在Si3N4颗粒附近的铝基体中,可以观察到高密度位错；Si3N4/Al复合材料的弯曲强度随着Si3N4体积分数的增大而降低；T6热处理能提高复合材料的强度；复合材料的弹性模量随着Si3N4体积分数的增加而线性增加；在低Si3N4体积分数时,可以观察到更多的撕裂棱和韧窝；T6热处理对断口形貌的影响较小.
채용압력침삼법제비Si3N4체적분수분별위45％、50％화55％적과립증강려기복합재료(Si3N4/Al).연구Si3N4체적분수화T6열처리대Si3N4/Al복합재료미관조직화역학성능적영향.결과표명:Si3N4과립분산균균,Si3N4/Al복합재료침삼량호,몰유명현적공동화주조결함；재Si3N4과립부근적려기체중,가이관찰도고밀도위착；Si3N4/Al복합재료적만곡강도수착Si3N4체적분수적증대이강저；T6열처리능제고복합재료적강도；복합재료적탄성모량수착Si3N4체적분수적증가이선성증가；재저Si3N4체적분수시,가이관찰도경다적시렬릉화인와；T6열처리대단구형모적영향교소.
Si3N4 particles reinforced aluminium matrix composites (Si3N4/Al) with different particle volume fractions (45％,50％,and 55％) were fabricated by pressure infiltration method.The effects of Si3N4 volume fraction and T6 treatment on mierostructure and mechanical properties of Si3N4/Al composite were investigated.The results show that Si3N4/Al composites are well infiltrated with good particles dispersion and no apparent porosity or significant casting defects are observed.High density of dislocations in Al matrix around Si3N4 particles is observed.The bending strength of Si3N4/Al composites decreases with an increase in Si3N4 volume fraction,and can be greatly improved by T6 treatment.Elastic modulus of composites increases linearly with Si3N4 volume fraction.At a lower Si3N4 volume fraction,more tearing ridge and dimples with elongation are observed.T6 heat treatment shows minor effect on the fracture surface of composite.