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Tang C.,Guangdong University of Technology | Liu Z.,Guangdong University of Technology | Zhou D.,Yinbang Metal Clad Material Co | Wu S.,Guangdong University of Technology
Strength of Materials | Year: 2015

The cold roll bonding process of a laminar metal composite consists of three steps, i.e., surface treatment, cold roll bonding, and heat treatment. The surface pretreatment is the precondition of obtaining a metal composite with a superior bonding level. The influence of the steel plate surface condition on the bonding strength is studied, based on the bonding mechanism of a laminar metal composite by cold roll bonding. Flap disc grinding is a better surface treatment than wire brushing for obtaining high bonding strength. Within a certain range, the larger the surface roughness, the higher the bonding strength. Comparing different grinding textures, viz longitudinal, transverse, and 45° with respect to the rolling direction, it was revealed that the longitudinal surface texture was more advantageous for bonding. © 2015 Springer Science+Business Media New York

Tang C.-L.,Guangdong University of Technology | Zhou D.-J.,Yinbang Metal Clad Material Co.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

The precipitation hardening behavior in dilute Al-Yb alloys upon annealing at different temperatures was investigated to shed light on the mechanism of micro-alloying element in aluminum alloys. When aging at different temperatures, the samples showed their corresponding peak hardness in the range of 400-416 MPa due to the precipitation of Al3Yb with L12 crystal structure. The coarsening kinetics of the Al3Yb precipitates obeyed the LSW theory, which indicated that the coarsening process was controlled by the diffusion of Yb. The coherence between Al3Yb particles and matrix was maintained until the particle size reached 11 nm. When the particle size increased to about 2 nm, the shearing mechanism started to change to Orowan mechanism. © 2014 The Nonferrous Metals Society of China.

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