Kinetics of formation and coarsening of nanoporous α-titanium dealloyed with Mg melt
Kinetics of formation and coarsening of nanoporous α-titanium dealloyed with Mg melt
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DOI：
10.1063/1.4821066
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发表时间：
2013-09
影响因子：
3.2
通讯作者：
M. Tsuda;T. Wada;H. Kato
中科院分区：
文献类型：
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作者：
M. Tsuda;T. Wada;H. Kato
研究了Ti-Cu合金向纳米多孔α-Ti的转变行为、脱合金反应动力学和纳米多孔α-Ti的粗化过程，探讨了金属熔体脱合金的机理。当Ti 50 Cu 50合金盘浸入Mg熔体中时，Cu含量从盘表面开始减少，并形成α-Ti和Ti 2Cu的过渡层。过渡层的生长遵循抛物线规律，活化能与溶质原子在液体中扩散的活化能接近，表明Cu在镁熔体中的扩散主要对脱合金反应的速率控制过程做出贡献。韧带尺寸随温度和时间的变化符合指数为4的幂律，表明表面扩散在粗化过程中起着重要作用。所有这些结果都与水溶液中的脱合金结果一致，表明金属熔体中的脱合金机理是硅化。
The transition behavior from a Ti–Cu alloy to nanoporous α-Ti, the kinetics of the dealloying reaction, and the coarsening of nanoporous α-Ti were studied, and the mechanism of dealloying with a metallic melt was investigated. When a Ti50Cu50 alloy disk was immersed in a Mg melt, the Cu content decreased from the surface of the disk, and transition layers of α-Ti and Ti2Cu were formed. The growth of the transition layers followed a parabolic law and the activation energy was close to those reported for the diffusion of solute atoms in liquids, suggesting that diffusion of Cu in the Mg melt mainly contributed to the rate-controlling process for the dealloying reaction. The temperature and time dependences of the ligament size followed a power law with an exponent of 4, suggesting that surface diffusion plays an important role in coarsening. All of these results are consistent with those reported for dealloying in aqueous solution, indicating that the underlying dealloying mechanism in a metallic melt is si...