Cold-rolling influence on microstructure and mechanical properties of NiCr-Ag composites and porous NiCr obtained by liquid metal dealloying
Cold-rolling influence on microstructure and mechanical properties of NiCr-Ag composites and porous NiCr obtained by liquid metal dealloying
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DOI：
10.1016/j.jallcom.2016.12.105
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发表时间：
2017-06
影响因子：
6.2
通讯作者：
M. Mokhtari;C. L. Bourlot;J. Adrien;S. Dancette;T. Wada;J. Duchet-Rumeau;H. Kato;E. Maire
中科院分区：
文献类型：
--
作者：
M. Mokhtari;C. L. Bourlot;J. Adrien;S. Dancette;T. Wada;J. Duchet-Rumeau;H. Kato;E. Maire
为了获得各向异性的纳米多孔NiCr，采用液态金属去合金化方法制备了NiCr-Ag复合材料，并在腐蚀前进行了冷轧。将（Ni 90 Cr 10）60 Cu 40前驱体浸入银液中，Cu原子选择性地迁移到银液中。冷却至室温后，所得组织为NiCr和Ag（Cu为固溶体）的双连续结构。这些钢锭足够坚固，可以在一个或两个（垂直）方向上冷轧，厚度减少70%。最后的蚀刻步骤去除Ag固态溶液相。冷轧的微观结构的影响进行了研究，使用X射线断层扫描和使用纳米压痕的机械性能。我们将展示如何将各向异性引入到微观结构和机械性能中，同时能够保持多孔状态。
To obtain anisotropic nanoporousNiCr, someNiCr-Agcomposites were prepared using a liquid metal dealloying method and were cold rolled before etching. While immersing (Ni90Cr10)60Cu40precursors in a moltenAgbath,Cuatoms selectively migrate into theAgbath. After cooling down to room temperature, the resulting microstructure is a bi-continuous structure ofNiCrand Ag(withCuin solid solution). These ingots are strong enough to be cold rolled in one or two (perpendicular) directions with a thickness reduction of 70%. A final etching step removes the Agsolid-state solution phase. The influence of cold rolling on the microstructure was investigated using X-ray tomography and on the mechanical properties using nanoindentation. We will show how introducing anisotropy into the microstructure and in the mechanical properties was successful while being able to preserve the porous state.