FANN Kuang-Jau

Spoluautoři PENG Li-Han

Lightweight is one of methods for low-carbon design. Based on the lightweight applications potential of metal composite bulks and on the fact that the interface between metals is externally visible currently, this study aims to investigate the feasibility to create core-shell type metal composite bulks. In this study, extrusion is proposed to realize such type of composite. The shell material is suggested to be made as socket shape by backward-extrusion of a metal rod, while the core metal keeps its rod shape. The latter is inserted in the former and then completely encapsulated by using forward-extrusion. In this article an aluminum alloy 6061 is used as the shell metal and alloy 7075 as the core metal of the bulk. Before carrying out the experiments, the feasibility of the process is studied with a commercial finite element software DEFORM according to the Taguchi method regarding the influence of the four primary factors – its area reduction ratio, die angle, die radius, and working temperature – respectively with three levels, on the top end shutting of its shell metal. As a result, the two most important factors are the area reduction ratio and the die angle while corner radius practically has no effect. Six processes with higher area reduction are examined by experimentation. From the results in both of finite element analysis and experiment, the feasibility making the core-shell type metal composite bulk by using hot extrusion is positively confirmed.