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Microstructural characterization,tribological and corrosion behavior of AA7075-TiC composites

China Foundry 2024年第4期21卷 334-342页

作者： surendarnath sundaramoorthy Ramesh Gopalan Ramachandran Thulasiram Department of Mechanical Engineering DVR&Dr.HS MIC College of Technology(A)Vijayawada521180India Department of Metallurgical and Materials Engineering Rajiv Gandhi University of Knowledge TechnologiesRK ValleyKadapaIndia Department of Mechanical Engineering Jain UniversityBangaloreIndia

Aluminum alloys are the potential materials in the automobile and aerospace sectors due to their lower density,easy forming and excellent corrosion *** demand of high strength-to-weight ratio materials in structural applications needs the engineering industries to seek aluminum alloy with new versions of hard and brittle ceramic *** microstructure,hardness,wear and corrosion behaviors of AA7075 composites with 2.5wt.%and 5wt.%TiC particles were *** analysis is evident that the transformation of the strong dendritic morphology to non-dendritic morphology on the incorporation of TiC into ***,the precipitation of the second-phase compounds such as Al_(2)CuMg,Al_(2)Cu andFe-rich Al_6(Cu,Fe)/Al_(7)Cu_(2)Fe)is promoted by TiC particles at inter-and intra-dendritic ***,the hardness of composites is improved by grain boundary strengthening and particulate strengthening *** coefficient of friction and wear rate have an inverse relation with TiC *** base alloy without TiC shows adhesive-type wear-induced deformation due to the formation of an oxide film,while composite samples exhibit a mechanically mixed layer and abrasive-type wear *** samples shows a higher corrosion rate due to the presence of numerous precipitates which promote pitting corrosion.

关键词： AA7075 alloy TiC reinforcement composite microstructure wear corrosion tribological

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Characterization of microstructure and wear behavior of nickel modified Zn-27%Al alloy casting

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China Foundry 2024年第6期21卷 693-701页

作者： Anusha Raj Kota Ramesh Gopalan Babu Rao Jinugu surendarnath sundaramoorthy Department of Metallurgical and Materials Engineering Rajiv Gandhi University of Knowledge Technologies-R K Valley CampusKadapaAndhra PradeshIndia Department of Metallurgical Engineering AU College of Engineering-Andhra UniversityVisakhapatnamAndhra PradeshIndia Department of Mechanical Engineering DVR&Dr.HS MIC College of Technology(A)VijayawadaAndhra PradeshIndia

Improvement of mechanical and tribological behaviors of zinc-based die cast alloy is necessary for bearing applications,and chemical modification is found to be a good *** modification of Zn-27wt.%Al alloy was carried out with 1%,2%and 3%nickel through casting route,and its effect on microstructure,hardness,and dry sliding wear behavior was *** refinement of dendritic microstructure is observed along with a transformation from rosette to near rounded morphology with the increase in nickel content of base *** 1%nickel modification,an aluminum-rich Al_(3)Ni intermetallic compound of string type forms in inter dendritic region,while with 2%and 3%nickel modifications,a nickel-rich AlNi3 intermetallic compound of lath/plate type is formed within the intra dendritic *** of the base alloy is improved through grain boundary strengthening at a lower concentration of nickel,and particulate strengthening and spinodal decomposition are the reason for increase in hardness of the alloy with a higher content of *** of friction and wear rate of base alloy is decreased with increasing nickel *** surface is characterized by delamination,smearing and *** wear mechanism is transferred from adhesion to abrasive via oxide film formation with an increase in amount of nickel.

关键词： ZA alloy nickel modifications microstructure dry sliding wear hardness

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