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
复制标题
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
中科院分区:
文献类型:
--
作者:
Xiao Xiazi;Liu Hao;Yu Long
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.
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DOI:
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DOI:
10.1016/j.msea.2019.138326
发表时间:
2019-10
期刊:
Materials Science and Engineering: A
影响因子:
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通讯作者:
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