An Analytical Model for Oblique Cross Section Nanoindentation of Ion-Irradiated Metallic Alloys Based on Studies of Oxide Dispersion Strengthened Steel MA957,Advanced Engineering Materials

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An Analytical Model for Oblique Cross Section Nanoindentation of Ion-Irradiated Metallic Alloys Based on Studies of Oxide Dispersion Strengthened Steel MA957
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-01-15 , DOI: 10.1002/adem.202001431
Dhriti Bhattacharyya _{1,

2} , Christopher Hurt ₂ , Alan Xu _{1,

2} , Mihail Ionescu _{1,

3}

Affiliation

Herein, oblique cross section (OCS) nanoindentation is used to measure the hardness changes in He²⁺ ion-irradiated oxide dispersion strengthened (ODS) steel MA957, to obtain the hardness profile through the thickness, and correlate it with the damage dose profile. Following this, the dispersed barrier hardening (DBH) model is implemented to calculate the hardness of each layer of the irradiated material, based on the displacement damage and He concentration from simulations. Next, a simplified analytical model for the measured hardness at different depths is developed with the assumption that the plastic zone under the indenter is hemispherical and the hardness measured at any given depth depends on the average hardness of the plastic zone volume. This analytical model is implemented with the help of a program written in MATLAB. The calculated hardness profile is compared with the experimental profile, and it is found to be in reasonably good agreement for different energies of the irradiating He ions. This model can be used not only for ion-irradiated materials with varying doses in different layers but also for other metallic materials with surface layers having diffuse interfaces.

中文翻译：

基于氧化物弥散强化钢MA957研究的离子辐照金属合金斜截面纳米压痕分析模型

本文中，斜截面（OCS）纳米压痕用于测量He ^2+中的硬度变化离子辐照氧化物弥散强化（ODS）钢MA957，通过厚度获得硬度分布，并将其与损伤剂量分布相关联。此后，基于位移损伤和模拟得出的He浓度，实施了弥散势垒硬化（DBH）模型来计算被辐照材料每一层的硬度。接下来，假设在压头下的塑料区域是半球形的，并且在任何给定深度下测量的硬度取决于塑料区域体积的平均硬度，就可以得出在不同深度下测得的硬度的简化分析模型。该分析模型是在用MATLAB编写的程序的帮助下实现的。将计算出的硬度曲线与实验曲线进行比较，并且发现对于辐射的He离子的不同能量，它具有相当好的一致性。该模型不仅可以用于在不同层中具有不同剂量的离子辐照材料，而且还可以用于表面层具有扩散界面的其他金属材料。

更新日期：2021-01-15

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