Friction transitions in nanocrystalline nickel
Friction transitions in nanocrystalline nickel
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DOI：
10.1016/j.scriptamat.2010.12.027
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发表时间：
2011-04-01
影响因子：
6
通讯作者：
Kotula, P. G.
中科院分区：
文献类型：
--
作者：
Prasad, S. V.;Battaile, C. C.;Kotula, P. G.
具有20-100 nm尺寸晶粒的纳米晶Ni膜表现出两种不同的摩擦行为，取决于接触压力和滑动速度，μ类似于0.30-0.35或μ类似于0.6-0.7。磨损表面的横截面透射电子显微镜进行了分析的晶粒结构的变化引起的。在磨损表面下形成具有2-10 nm尺寸晶粒的稳定的超细纳米晶层可能是观察到的摩擦转变的原因，这可能是由于从传统的位错塑性向由晶界控制的变形的转变。(C)2011 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Nanocrystalline Ni films with 20-100 nm size grains exhibited either of two distinct friction behaviors, mu similar to 0.30-0.35 or mu similar to 0.6-0.7, depending upon the contact pressure and sliding speed. Friction-induced changes to grain structure were analyzed by cross-sectional transmission electron microscopy of wear surfaces. Formation of stable ultrafine nanocrystalline layers with 2-10 nm size grains underneath the wear surface may be responsible for the observed friction transitions, possibly due to a transition from traditional dislocation plasticity to deformation controlled by grain boundaries. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.