Size-affected single-slip behavior of pure nickel microcrystals
Size-affected single-slip behavior of pure nickel microcrystals
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DOI：
10.1016/j.actamat.2005.05.023
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发表时间：
2005-09-01
期刊：
影响因子：
9.4
通讯作者：
Parthasarathy, TA
中科院分区：
文献类型：
--
作者：
Dimiduk, DM;Uchic, MD;Parthasarathy, TA
晶体塑性的空间尺度被理解为影响流动应力和加工硬化率。对于样品直径范围为40至1.0 μ m的纯Ni单滑移取向晶体，直接评估了临界分辨剪切应力的晶体尺寸依赖性。样品尺寸直接限制了塑性可用的长度尺度，但没有明显的外部或运动学约束。结果表明，强度增加高达15倍以上的纯镍和尺寸影响硬化率。应力较低，但加强持续到更大的尺寸比以前的工作面心立方金属晶须。结果强调，在微米级及以下的外部几何形状和内部结构影响变形和强度的微观机制。(c)2005 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Spatial scales in crystal plasticity are understood to influence flow stresses and work-hardening rates. A direct assessment of the crystal-size dependence of the critical resolved shear stress has been made for single-slip oriented crystals of pure Ni having sample diameters that range from 40 to 1.0 mu m. The sample dimensions directly limit the length scales available for plasticity, but without significant external or kinematical constraint. The results show strength increases of up to 15 times over pure Ni and size-affected hardening rates. Stresses are lower, but strengthening persists to larger sizes than for the prior work on face-centered cubic metal whiskers. The results emphasize that at the micron-size scale and below both external geometry and internal structure affect the micromechanisms of deformation and strength. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.