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Evaluation of diffusion and phase transformation at ag/Al bimetal produced by cold roll welding

Transactions of Nonferrous Metals Society of China 2012年第2期22卷 312-317页

作者： Hossein OLIA Mehrdad ABBASI Seyed Hossein RAZAVI Material Science and Engineering Department Islamic Azad UniversityKaraj BranchP.O.Box 31485-313KarajIran Metallurgical Engineering Department Iran University of Science and TechnologyP.O.Box 31485-313NarmakTehranIran

Aluminum and silver strips were cold welded by rolling and a bimetallic strip was produced. To create cold weld between a1 and ag, mating surfaces were specially prepared and various rolling thickness reductions were applied. The minimum critical thickness reduction to begin cold weld was specified as 70% which equals 0.1630 critical rolling shape factors. The bimetallic strips were treated by diffusion annealing at 400 ~C and various annealing time. The a1/ag interface of strips was observed by scanning electron microscope to investigate the formation of hard and brittle probable phases. The effect of anneal time on diffusion distance and phase transformation was also analysed by EDS analysis and line scan. A diffusion region along the interface in the ag side was observed and its width increased with prolonging annealing time. Some 8 phases were detected close to the interface after anneal treating for 3 h and 8 phase was thicker and more continuous by increasing annealing time. The microhardness measurement showed that in spite of formation of 8 phase due to diffusion annealing, the interface hardness was reduced.

关键词： ag/a1 bimetallic strip cold weld anneal multilayer composite sheet shape factor

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