510 Kirkendall Effect in Diffusion Bonding and Laser Roll Bonding of A5052 aluminium alloy and SPCC steel
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概要
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Joining of dissimilar metal pair of steel and aluminium is getting importance as a means of improvement of strength to weight ratio of structural parts in automobile vehicles. Diffusion bonding and laser roll bonding were conducted to understand the changes in microstructure taking place at the interface of low carbon steel (SPCC) and A5052 aluminium alloy. The object of this study was to establish the time-temperature-phase diagram (TIT diagram) under varying compressive pressures during the diffusion bonding and to identify the intermetallic compounds (called hereafter as IMC) forming at the interface. It was also aimed to determine the effect of pressure on kinetics of IMC layer formation at the interface. Mechanism of interface layer formation and Kirkendall void were investigated. There are two distinct layers namely uniform layer on steel side and mixed layer on aluminium side in diffusion-bonded joints. Uniform layer is made up of FeA13 compound and it protrudes in the steel side with spike shaped boundary. It also contains linear voids perpendicular to the interface indicating flow of atoms across it. It is thought that, this void is the result of Kirkendall effect occurring due to faster diffusion of iron in aluminium than visa versa. Mixed layer consists of aluminium islands surrounded by FeA1_3・Laser roll bonded joints showed only uniform layer with spiked boundary on steel side. Kirkendall voids were also seen in the uniform layer of laser roll bonded joints.
- 一般社団法人日本機械学会の論文
著者
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Rathod M.
Dept. Of Materials Processing Engineering School Of Engineering Nagoya University:(present Address)
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Kutsuna M.
Dept. Of Materials Processing Engineering School Of Engineering Nagoya University