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Study on Aluminium Matrix Multilayered Composite Produced by Accumulative Roll Bonding

Author: LiuHuaSai
Tutor: ZhangBin；ZhangGuangPing
School: Northeastern University
Course: Materials Science
Keywords: Accumulative roll bonding Al/A231 metal multilayer composites Al / Cu metal multilayer composites Interfacial diffusion layer EDS analysis Microstructure Microhardness
CLC: TG339
Type: Master's thesis
Year: 2008
Downloads: 78
Quote: 1
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Abstract


In this study, the accumulative roll bonding technique, prepared Al/AZ31 well of Al / Cu metal multilayer composites, and sampling Al/AZ31 well of Al / Cu metal multilayer composite cross section. The Al/AZ31 Al / Cu metal multilayer composites cross-section morphology by scanning electron microscopy (SEM) analysis, X-ray spectroscopy analyzer (EDS) Al/AZ31 Al / Cu metal multilayer composites The cross-sectional component analysis using transmission electron microscopy (TEM) analysis of the structural characteristics of the Al layer in multilayer composites Al/AZ31 metal microstructure, X-ray diffraction (XRD) analysis of Al / Cu metal multilayer composite cross The cross-section of the phase composition, of Al/AZ31 and Al / Cu metal multilayer composite cross-section of the hardness measurement. Accumulative roll bonding process and metal multilayer composite interfacial bonding mechanisms were discussed. The results show that: prepared by accumulative roll bonding method can Al/AZ31, and Al / Cu metal multilayer composite materials. Group element layer grain roll significantly refined lead Al/AZ31, and Al / Cu metal multilayer hardness of the composites increased gradually with the increase of Roll pass. Roll Al and AZ31 alloy, and Cu and Al at the interface forming a the micron scale diffusion layer, the thickness of the diffusion layer increases with the increase of the total equivalent strain (rolling passes). Local Al/AZ31 interfacial diffusion layer microhardness Characterization that the diffusion layer hardness gradient exists. The significant contribution of the third pass formed the high hardness Al/AZ31 diffusion layer of the multilayer material of equivalent hardness. Diffusion layer thickness and structure of the control interface has an important impact on the excellent mechanical properties of multilayer composite. Al / Cu multi-layer composite material layer component microhardness gradually increases with increasing passes, wherein the first pass microhardness varies widely, after a relatively slow. Roll one to five times the Al / Cu metal multilayer composites tensile test, Al / Cu multilayer composites by the first times rolling after the comprehensive mechanical properties better, starting from the second pass. , as the passes increases, the tensile strength increased, decreased plasticity. Accumulated roll bonding method to achieve metallurgical bonding between different materials, interface binding mechanism for the diffusion mechanism, it is achieved by rolling before heat insulation as well as the cumulative strain, rolling the higher the temperature, the greater the reduction diffusion process more fully, which have a decisive influence on the binding strength. Intermetallic compound interface generated in the diffusion layer has an important effect on the overall performance of the material.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Rolling > Non-ferrous metal rolling
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