Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 9 No. 2 June 1999|
（Southwest Aluminium Fabrication Plant, Chongqing401326, P. R. China；
Department of Metallurgy and Materials Engineering,Chongqing University, Chongqing400044, P. R. China）
Abstract:The rolling deformation laws of Al-Si/Al-Mn tri-layer clad sheet were investigated, which include the changing law of clad rate(ratio of clad thickness), the relationship of deformation speed of matrix material and clad material, the heterogenous distribution of thickness of clad layer, and the clad process of matrix material and clad material. The results show that in whole rolling process, the thickness of clad layer is heterogenous along the width direction, the changing at the edge is larger at the center, and the heterogeneity has heredity. At the beginning of cladding, the deformation of clad layer is larger than that of matrix, the clad rate descends rapidly, but the clad rate decreases gradually with rolling developing. After cladding, the cladding rate and the ratio ofμc/μmkeep unchanged. In the whole rolling process, the deformation speed of clad layer is always larger than that of matrix, but the changing tendency of their speeds is identical. The clad process of matrix metal and clad metal can be divided into 3 stages: free (slip or nonrestraining) deformation stage, partial restraining (partial clad) deformation stage, full restraining (full clad) deformation stage.
Key words: aluminium alloy clad sheet rolling deformation deformation law