In-situ X-ray diffraction study on dealloying: A scenario of a Cu90Au10 alloy

In-situ X-ray diffraction study on dealloying: A scenario of a Cu90Au10 alloy
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脱合金的原位 X 射线衍射研究:Cu90Au10 合金的情况

DOI:
10.1016/j.jpcs.2020.109879
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发表时间:
2021-03
影响因子:
4
通讯作者:
Zhonghua Zhang
Zhonghua Zhang
中科院分区:
材料科学3区
文献类型:
--
作者:
Ying Zhang;Faluo Kui;Qingguo Bai;Chi Zhang;Bin Yu;Zhonghua Zhang

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原位表征对于揭示脱合金机制至关重要,但正常的x射线信号会受到水溶液的干扰。在此基础上,设计了一种具有流动溶液的特殊样品架,用于原位x射线衍射(XRD)测量,并以cu90au10合金为例,利用原位x射线衍射(XRD)研究了其脱合金机理。结果表明,在Cu90Au10的脱合金过程中没有出现中间相,表明Cu(Au)固溶体直接相变为纳米孔Au。此外,Au相的峰值位置呈现非单调位移,这与合金化过程中产生的复杂应变状态有关。
In-situcharacterizations are of central importance to unveil dealloying mechanisms, but normal X-ray signals suffer from the interference from aqueous solutions. Herein, a special sample holder with flowing solutions was designed forin-situX-ray diffraction (XRD) measurements, and a Cu90Au10alloy was chosen as an example to investigate the dealloying mechanism usingin-situXRD. The results demonstrate that no intermediate phase appears during the dealloying of Cu90Au10, revealing a direct phase transformation from Cu(Au) solid solution to nanoporous Au. Moreover, the peak position of Au phase shows a non-monotonic shift, associated with complex strain states generated during dealloying.
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