On the Size Effect of Strain Rate Sensitivity and Activation Volume for Face-Centered Cubic Materials: A Scaling Law

On the Size Effect of Strain Rate Sensitivity and Activation Volume for Face-Centered Cubic Materials: A Scaling Law
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关于面心立方材料应变率敏感性和活化体积的尺寸效应:比例定律

DOI:
10.3390/cryst10100898
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发表时间:
2020-10
期刊:
影响因子:
2.7
通讯作者:
Yu Long
Yu Long
中科院分区:
材料科学3区
文献类型:
--
作者:
Xiao Xiazi;Liu Hao;Yu Long

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在最近的压痕蠕变实验研究中,人们注意到面心立方材料的应变速率敏感性(SRS)和激活体积v*依赖于压痕深度或加载力。尽管已经提出了几种可能的解释,但基本机制仍然没有得到很好的解决。在这项工作中,提出了压痕深度或加载力相关的SRS的标度律。此外,通过∂ln(v*/b3)/∂lnh=−2与Burgers矢量b的关系表明,v*与硬度H成比例关系。我们表明,这种尺寸效应和激活体积主要归因于蠕变过程中几何必要位错的演化。通过将理论计算结果与已报道的不同实验数据进行比较,验证了所提出的规律,并取得了较好的一致性。
In a recent experimental study of indentation creep, the strain rate sensitivity (SRS) and activation volume v* have been noticed to be dependent on the indentation depth or loading force for face-centered cubic materials. Although several possible interpretations have been proposed, the fundamental mechanism is still not well addressed. In this work, a scaling law is proposed for the indentation depth or loading force-dependent SRS. Moreover, v* is indicated to scale with hardness H by the relation ∂ln(v*/b3)/∂lnH=−2 with the Burgers vector b. We show that this size effect of SRS and activation volume can mainly be ascribed to the evolution of geometrically necessary dislocations during the creep process. By comparing the theoretical results with different sets of reported experimental data, the proposed law is verified and a good agreement is achieved.
纳米结构 Cu/X (X = Cr, Zr) 多层薄膜中尺寸相关的变形机制和应变率敏感性
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