(1. 南昌大学 机电工程学院 材料加工工程系，南昌 330031;
2. 南昌市轻合金材料制备与加工重点实验室，南昌 330031)
摘 要: 利用MMD-1型销盘式磨损试验机，采用OM、SEM和EDS研究不同负载对Sr变质ADC12合金的摩擦磨损性能的影响，并探究其与合金显微组织及力学性能的关系。结果表明:当添加0.05%Sr(质量分数)时，合金显微组织中共晶Si相以颗粒状或纤维状均匀分布在晶界，富铁相则呈短棒状，此时合金力学性能最佳，且同一负载下其磨损量和摩擦因数均最低。当负载为100N时，因受到严重挤压变形，合金表面氧化膜发生破坏;基体合金以塑性屈服和严重剥层磨损为主要磨损机理;而当Sr添加量为0.05%时，合金的磨损程度最低，以粘着磨损和磨粒磨损为主要磨损机理，其摩擦磨损性能最优异。
关键字: Sr变质;ADC12合金;摩擦磨损;磨损机理
（1. Department of Materials Processing Engineering, School of Mechanical and Electrical Engineering,
Nanchang University, Nanchang 330031, China;
2. Key Laboratory of Light Alloy Preparation & Processing in Nanchang City, Nanchang 330031, China）
Abstract:The effect of applied load on the friction and wear properties of Sr modified ADC12 alloys, and its relationship with microstructure and mechanical properties were investigated by MMD-1 pin-on-disc wear testing machine, OM, SEM and EDS. The results show that, in the microstructure of alloy modified with 0.05%Sr (mass fraction), eutectic Si phases distribute uniformly at grain boundaries in morphologies of particle-like or fiber-like, and shape of Fe-rich intermetallics transforms to short rod-like, giving rise mechanical properties to the highest. Also the alloy wear volume and friction coefficient reach to the lowest under invariable load. At 100 N, oxide films on worn surface are broken due to the serious extruded deformation. Plastic yielding and severe delamination are mainly in the matrix alloy, while adhesive and abrasive wear characterize in the modified alloy with 0.05%Sr. The wear degree of the latter one is the minimum, and its friction and wear properties are the optimal.
Key words: Sr modification; ADC12 alloy; friction and wear; wear mechanism
