Model for the spherical indentation stress-strain relationships of ion-irradiated materials
Model for the spherical indentation stress-strain relationships of ion-irradiated materials
复制标题
离子辐照材料的球形压痕应力-应变关系模型
DOI：
10.1016/j.jmps.2019.103694
复制
发表时间：
2019-11
影响因子：
5.3
通讯作者：
Yu Long
中科院分区：
文献类型：
--
作者：
Xiao Xiazi;Terentyev Dmitry;Yu Long
在这项工作中，提出了一个力学模型来表征球形压痕应力应变（ISS）关系的离子辐照材料。三个基本的变形机制占所开发的模型，包括压痕尺寸效应（伊势）归因于几何必要的位错（GNDs），辐照硬化确定的辐照诱导的缺陷和应变软化的影响，去除缺陷和未辐照基板。考虑了弹性变形对压痕应力的影响，忽略弹性变形会导致在较小的压痕应变下高估压痕应力。此外，辐射引起的缺陷的消除，通过扩展塑性变形和软化效应引起的未辐照基板被认为是同时考虑到应变软化现象与辐照效应，这是众所周知的，在常规拉伸试验后的屈服点。通过比较未辐照材料（铱、镍、铝和铜）和离子辐照Fe-12 Cr合金的实验数据，观察到我们的模型结果有很好的一致性。该模型提供了一个很有前途的方式来定性比较ISS关系的离子辐照材料和单轴应力-应变曲线的中子辐照材料。
In this work, a mechanistic model is proposed to characterize the spherical indentation stress-strain (ISS) relationships of ion-irradiated materials. Three fundamental deformation mechanisms are accounted for by the developed model, including the indentation size effect (ISE) ascribed to geometrically necessary dislocations (GNDs), irradiation hardening determined by irradiation-induced defects and strain softening affected by the removal of defects and unirradiated substrate. The contribution of elastic deformation is involved to model the ISE of spherical indentation, ignoring which can result in the overestimation of the indentation stress at a small indentation strain. In addition, the removal of irradiation-induced defects by outspreading plastic deformation and softening effect induced by the unirradiated substrate are simultaneously considered to account for the strain softening phenomenon with irradiation effect, which is well known in conventional tensile tests after the yield point. A good agreement is observed by comparing our model results with the experimental data of unirradiated materials (iridium, nickel, aluminum and copper) and ion-irradiated Fe-12Cr alloy. The proposed model offers a promising way to qualitatively compare the ISS relationships of ion-irradiated materials and uniaxial stress-strain curves of neutron-irradiated materials.
登录
查看更多内容
影响因子：
9.8
作者：
S. Qu;Yonggang Huang;G. Pharr;K. Hwang
通讯作者：
S. Qu;Yonggang Huang;G. Pharr;K. Hwang
DOI：
10.1080/01418610208235717
发表时间：
2002-07
期刊：
Philosophical Magazine A
影响因子：
--
作者：
Y. Y. Lim-Y.;M. M. Chaudhri-M.
通讯作者：
Y. Y. Lim-Y.;M. M. Chaudhri-M.
影响因子：
2.7
作者：
Bushby, Andrew J.;Roberts, Steve G.;Hardie, Christopher D.
通讯作者：
Hardie, Christopher D.
影响因子：
6
作者：
G. Nayyeri;Warren J. Poole;C. Sinclair;S. Zaefferer
通讯作者：
G. Nayyeri;Warren J. Poole;C. Sinclair;S. Zaefferer
影响因子：
3.1
作者：
J. Weaver;Siddhartha Pathak;A. Reichardt;H. Vo;S. Maloy;P. Hosemann;N. Mara
通讯作者：
J. Weaver;Siddhartha Pathak;A. Reichardt;H. Vo;S. Maloy;P. Hosemann;N. Mara