Strategy for Electrodeposition of Highly Ductile Bulk Nanocrystalline Metals with a Face-Centered Cubic Structure
Strategy for Electrodeposition of Highly Ductile Bulk Nanocrystalline Metals with a Face-Centered Cubic Structure
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DOI：
10.2320/matertrans.m2014268
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发表时间：
2014-12-01
影响因子：
1.2
通讯作者：
Higashi, Kenji
中科院分区：
文献类型：
--
作者：
Matsui, Isao;Takigawa, Yorinobu;Higashi, Kenji
提出了一种在Ni-W合金模型系统中制备具有面心立方结构的高延展性电沉积体纳米晶金属的方法。制备出晶粒尺寸相近（20 ~ 30 nm）、晶粒取向不同的大块Ni-W纳米合金。电沉积合金的拉伸伸长率在0 ~ 13%之间。扫描离子显微镜显示，所有电沉积合金具有类似的典型电沉积金属的中观尺度结构。这表明塑性和断口表面的变化不是由纳米颗粒填充的团簇结构引起的。考虑到电沉积过程中生长过程对氢和缺陷的影响，可以解释大块纳米晶Ni-W合金的拉伸行为。我们围绕Ni-W合金的讨论概述了获得高拉伸延展性所需的条件。我们的发现与其他电沉积纳米晶面心立方金属的结果一致。我们还提供了选择电沉积条件的指南，以生产具有面心立方结构和高拉伸延展性的大块纳米晶金属。
A strategy for producing highly ductile electrodeposited bulk nanocrystalline metals with face-centered cubic structures was developed in a Ni-W alloy model system. Bulk nanocrystalline Ni-W alloys with similar grain size (20-30 nm), and varying crystallographic orientations were produced. The electrodeposited alloys showed tensile elongation ranging between 0 and 13%. Scanning ion microscopy reveled that all electrodeposited alloys had similar meso-scale structures that are typical of electrodeposited metals. This indicated the variation of ductility and fracture surfaces was not caused by cluster structures filled with nano-grains. The tensile behavior of the bulk nanocrystalline Ni-W alloys could be explained by considering the effects of growth processes during electrodeposition on the presence of hydrogen and defects. Our discussion surrounding Ni-W alloys outlines the conditions necessary to obtain the high tensile ductility. Our findings are in good agreement with those for other electrodeposited nanocrystalline face-centered cubic metals. We also provide guidelines for selecting electrodeposition conditions to produce bulk nanocrystalline metals with face-centered cubic structures and high tensile ductility.