Selective dissolution of nanolamellar Ti–41 at.% Al alloy single crystals
Selective dissolution of nanolamellar Ti–41 at.% Al alloy single crystals
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DOI：
10.1016/j.actamat.2010.01.016
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发表时间：
2010-05
期刊：
影响因子：
9.4
通讯作者：
Yuichiro Koizumi;A. Sugihara;H. Tsuchiya;Y. Minamino;S. Fujimoto;H. Yasuda;M. Yoshiya
中科院分区：
文献类型：
--
作者：
Yuichiro Koizumi;A. Sugihara;H. Tsuchiya;Y. Minamino;S. Fujimoto;H. Yasuda;M. Yoshiya
Ti-41 at.%的选择性溶解行为本文研究了片层厚度为20 nm ~ 1μm的α2/γ-片层结构Al单晶在0.5MNaCl水溶液中的溶解，着重研究了片层厚度对γ-片层溶解的影响。当γ-薄片平均厚度大于100 nm时，γ-薄片被选择性溶解，形成宽度接近γ-薄片厚度的裂隙。然而，并不是所有的γ-Lamb都被溶解，裂隙的分布远不如γ-Lamb均匀。当γ-片层平均厚度<100 nm时，相对较厚的γ-片层优先溶解，但裂隙分布相对较均匀。从纳米尺度薄片中不存在失配位错和γ-薄片溶解形成的不同宽度裂隙中离子输运的差异的角度讨论了这种差异的原因。
The selective dissolution behavior of Ti–41 at.% Al single crystals having a α2/γ-lamellar structure with a lamellar thickness in the range 20nm to 1μm have been investigated in 0.5M NaCl aqueous solution focusing on the effect of lamellar thickness on the dissolution of γ-lamellae. In the case where γ-lamellae were thicker than ∼100nm on average, γ-lamellae were selectively dissolved and, as a result, crevasses whose widths were close to the γ-lamellae thicknesses were formed. However, not all γ-lamellae were dissolved and the distribution of crevasses was much less uniform compared with that of the γ-lamellae. On the other hand, when the average γ-lamellae thickness was <100nm relatively thick γ-lamellae were preferentially dissolved, but the distribution of the crevasses was relatively uniform compared with that obtained from the coarse lamellar structure. The reasons for this difference are discussed from the viewpoint of the absence of misfit dislocations in nanoscaled lamellae and the difference in ion transport through crevasses of different width formed by dissolution of γ-lamellae.