Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145484 | International Journal of Hydrogen Energy | 2017 | 9 Pages |
Abstract
The formation mechanism of microstructures in Mg/Cu super-laminates composites (SLCs) fabricated by accumulative roll-bonding (ARB) during initial activation was investigated. It is revealed that Mg2Cu can grow with sufficient growth rate at low temperatures (<453 K) in Mg/Cu SLCs. The growth of Mg2Cu layers for short growth length is diffusion-controlled. The activation energies for layer growth process of Mg2Cu layers in Mg/Cu SLCs are 107 ± 8 kJmolâ1 with acid cleaning prior to ARB and 103 ± 12 kJmolâ1 without acid cleaning prior to ARB, respectively, which are about 2/3 of those in MgCu diffusion couples. It is considered that the high density of lattice defects in Mg/Cu SLCs fabricated by ARB contributes the much lower activation energies for layer growth process of Mg2Cu layers in Mg/Cu SLCs than in MgCu diffusion couples.
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Authors
Koji Tanaka, Daiji Nishino, Kousei Hayashi, Shuki Ikeuchi, Ryota Kondo, Hiroyuki T. Takeshita,