A methodology to investigate size scale effects in crystalline plasticity using uniaxial compression testing
A methodology to investigate size scale effects in crystalline plasticity using uniaxial compression testing
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DOI：
10.1016/j.msea.2005.03.082
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发表时间：
2005-07-25
期刊：
影响因子：
6.4
通讯作者：
Dimiduk, DA
中科院分区：
文献类型：
--
作者：
Uchic, MD;Dimiduk, DA
提出了一种对微米级尺寸的样品进行单轴压缩测试的方法。样品制造是使用聚焦离子束铣削来完成的，以创建具有均匀横截面的圆柱形样品，该样品的一端仍附着在块状基板上。制作完成后，使用配备扁平尖端的纳米压痕装置对样品进行单轴压缩测试，并获得应力-应变曲线。该方法可用于检查来自相同散装材料的不同尺寸样品的塑性响应。通过这种方式，可以使用易于解释的测试来探索单晶在微米级的尺寸尺寸效应，从而最大限度地减少施加的拉伸和弯曲梯度。该方法应用于单晶镍高温合金，对于直径为 5 μm 或更小的样品，观察到从块状行为到尺寸影响行为的转变。 (c) 2005 Elsevier B.V. 保留所有权利。
A methodology for performing uniaxial compression tests on samples having micron-size dimensions is presented. Sample fabrication is accomplished using focused ion beam milling to create cylindrical samples of uniform cross-section that remain attached to the bulk substrate at one end. Once fabricated, samples are tested in uniaxial compression using a nanoindentation device outfitted with a flat tip, and a stress-strain curve is obtained. The methodology can be used to examine the plastic response of samples of different sizes that are from the same bulk material. In this manner, dimensional size effects at the micron scale can be explored for single crystals, using a readily interpretable test that minimizes imposed stretch and bending gradients. The methodology was applied to a single-crystal Ni superalloy and a transition from bulk-like to size-affected behavior was observed for samples 5 mu m in diameter and smaller. (c) 2005 Elsevier B.V. All rights reserved.