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首页> 外文期刊>Journal of Materials Science >Preparation and characterization of nanoporous Cu6Sn5/Cu composite by chemical dealloying of Al-Cu-Sn ternary alloy
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Preparation and characterization of nanoporous Cu6Sn5/Cu composite by chemical dealloying of Al-Cu-Sn ternary alloy

机译：Al-Cu-Sn三元合金化学脱合金制备纳米多孔Cu6Sn5 / Cu复合材料及其表征

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摘要

In this article, a new ternary Al-Cu-Sn alloy system has been exploited to fabricate nanoporous Cu6Sn5/Cu composite slices through chemical dealloying in a 20 wt% NaOH solution at an elevated temperature. The microstructure of the sliced nanoporous Cu6Sn5/Cu composite was characterized using x-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, and transmission electron microscopy. The experimental results show that multi-phase precursor alloy comprises a-Al, Sn, and h-Al2Cu phases. The new phase Cu6Sn5 emerges through dealloying, and the as-dealloyed samples have three-dimensional (3D) structure composed of large-sized channels (hundreds of nanometers) and small-sized channels (tens of nanometers). Both the large- and small-sized pores are 3D, open and bicontinuous. The synergetic dealloying of a-Al and h-Al2Cu in the three-phase Al-Cu- Sn alloy and fast surface diffusion of Cu atoms and Sn atoms result in the formation of Cu6Sn5/Cu composite with bimodal channel size distributions. In addition, the dealloying duration plays a significant role in the formation of Cu6Sn5 and the length scales of the small-sized ligament/channels at a settled temperature.
机译：在本文中，已经开发了一种新的三元Al-Cu-Sn合金体系，可通过在高温下在20 wt％NaOH溶液中进行化学脱合金处理来制备纳米多孔Cu6Sn5 / Cu复合片。使用X射线衍射，扫描电子显微镜，能量色散X射线分析和透射电子显微镜表征了切片的纳米多孔Cu6Sn5 / Cu复合材料的微观结构。实验结果表明，多相前驱体合金包含a-Al，Sn和h-Al2Cu相。新相Cu6Sn5是通过脱合金而出现的，脱合金后的样品具有三维（3D）结构，该结构由大尺寸通道（数百纳米）和小尺寸通道（数十纳米）组成。大孔和小孔都是3D的，开放的和双连续的。三相Al-Cu-Sn合金中a-Al和h-Al2Cu的协同脱合金以及Cu原子和Sn原子的快速表面扩散导致形成具有双峰通道尺寸分布的Cu6Sn5 / Cu复合材料。另外，在稳定温度下，脱合金持续时间在Cu6Sn5的形成和小型韧带/通道的长度尺度中起着重要作用。

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