| In this article, using the spray deposited Al-17Si-1Fe-3.5Cu-2Mn-1Mg-2Ni-1Valloy extrusion billet, andusing orthogonal test method, determine the best solid solution treatment and artificial aging process. Base onthis, research alloy microstructure and hardness, tensile strength and wear resistance effects of solid solutiontreatment and different time nature aging and artificial aging,cryogenic time, and cryogenic count,thesequence.The results show that: as-cast tissue is comprised of the matrix, the beginning of the crystal Si, long stripsand needle the second phase.Needle phase of squeezed state alloy disappeared, the second phase is granulardistribution; After solid solution+aging treatment, some of the smaller size β-Si disappear, the larger sizeSilicon wafer early increase, the granular second phase more small and diffusion, The hardness and wearresistance of alloy improved; After solid solution and72h natural aging and artificial aging treatment, itshardness and wear resistance improved. Followed by solid solution and cryogenic and artificial agingtreatment, with the the extension of cryogenic time, the beginning of the crystal Si become obtuse, granularsecond phase become more small and diffusion, the mechanical properties of the alloy improved; Exchange theorder of the artificial aging process and cryogenic processing, performance doesn’t improve. And as theimprovement number of deep cryogenic treatment, mechanical properties is improved, but three performancehas no big changes in two performance.so, this article determine the best treatment that is520℃×3h+cryogenic processing (24h x2)+120℃x10h. |
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