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  

超声和机械振动对Al−12Si−4Cu−1Ni−1Mg−2Mn活塞合金中富Mn相的演变及其力学性能的影响

作　　者：Bo LIN Xiang-xiang HE Song-chao XIA Hua-qiang XIAO Yu-liang ZHAO Khashayar KHANLARI 林波;何项项;夏松超;肖华强;赵愈亮;Khashayar KHANLARI(贵州大学机械工程学院,贵阳550025;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;Department of Chemical&Biotechnological Engineering,Universitéde Sherbrooke,Québec,QC J1K 2R1,Canada)

机构地区：[1]School of Mechanical Engineering,Guizhou University,Guiyang 550025,China [2]School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,China [3]Centro Nacional de Investigaciones Metalúrgicas(CENIM),C.S.I.C.,Avda.de Gregorio del Amo 8,Madrid 28040,Spain [4]Department of Chemical&Biotechnological Engineering,Universitéde Sherbrooke,Québec,QC J1K 2R1,Canada

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第8期2393-2414,共22页中国有色金属学报（英文版）

基　　金：the National Natural Science Foundation of China(No.52265043);Science and Technology Plan,Guizhou Province,China(No.ZK2021(267));Technology Achievements Application and Industrialization Project,Guizhou Province,China(No.2021(067));Cultivation Project of Guizhou University,China(No.2019(23));Lastly,we thank the Shanghai Synchrotron Radiation Facility(SSRF)for providing the synchrotron radiation beamtime.

摘　　要：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 particles were 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 theα(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℃ exceeds that of commercial piston alloys.This indicates the high application potential of the developed piston alloys in density diesel engines.研究超声振动(UV)和机械振动(MV)对Al−12Si−4Cu−1Ni−1Mg−2Mn活塞合金中富Mn相演变及其力学性能的影响。结果表明,UV和UV+MV处理能显著细化和破碎合金的显微组织,且UV处理可以明显钝化初生富Mn金属间化合物Al15Mn3Si2相,并详细分析晶粒细化、钝化以及非枝晶颗粒的形成机理。与重力铸造的合金相比,经UV和UV+MV处理的合金在室温和高温下都表现出优异的拉伸性能和抗蠕变性能,这可归因于α(Al)晶粒和金属间化合物的细化、细小的耐热析出相比例增加以及纳米Si颗粒的形成。在350℃下,经UV处理合金的极限抗拉强度超过商用活塞合金,这表明所研制的活塞合金在高功率柴油机上具有很大的应用潜力。

关 键 词：Al−Si piston alloys Mn-rich phases mechanical properties ultrasonic vibration mechanical vibration 

分 类 号：TG146.2[一般工业技术—材料科学与工程]