Effect of ultrasonic and mechanical vibration treatments on evolution of Mn-rich phases and mechanical properties of Al-12Si-4Cu-1Ni-1Mg-2Mn piston alloys
Effect of ultrasonic and mechanical vibration treatments on evolution of Mn-rich phases and mechanical properties of Al-12Si-4Cu-1Ni-1Mg-2Mn piston alloys
林波 1何项项 1夏松超 1肖华强 1赵愈亮 2Khashayar KHANLARI3
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作者信息
1. 贵州大学机械工程学院,贵阳 550025
2. 东莞理工大学机械工程学院,东莞 523808;Centro Nacional de Investigaciones Metalúrgicas(CENIM),C.S.I.C.,Avda.de Gregorio del Amo 8,Madrid 28040,Spain
3. Department of Chemical & Biotechnological Engineering,Université de Sherbrooke,Québec,QC J1K 2R1,Canada
Effects of ultrasonic vibration(UV)and mechanical vibration(MV)on the Mn-rich phase modification and mechanical properties of Al-12Si-4Cu-1Ni-1Mg-2Mn piston alloys were investigated.The results show that the UV and UV+MV treatments can significantly refine and fragmentize the microstructures.In addition,UV treatment can significantly passivate the primary Mn-rich Al15Mn3Si2 intermetallics.The formation mechanisms of refinement and passivation of the grains and non-dendrite particleswere discussed.Compared with the gravity die-cast alloys,the UV and UV+MV treated alloys exhibit improved tensile and creep resistance at room and elevated temperatures.These results can be attributed to the refinement of the α(Al)grains and the secondary intermetallics,the increased proportion of refined heat-resistant precipitates,and the formation of nano-sized Si particles.The ultimate tensile strength of the UV treated alloys at 350 ℃ exceedsthat of commercial piston alloys.This indicates the high application potential of the developed piston alloys in density diesel engines.
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