Increase in elastic anisotropy of single crystal tungsten upon He-ion implantation measured with laser-generated surface acoustic waves

被引：28

作者：

Duncan, R. A. ^{[1
]}

Hofmann, F. ^{[2
]}

Vega-Flick, A. ^{[1
,3
]}

Eliason, J. K. ^{[1
]}

Maznev, A. A. ^{[1
]}

Every, A. G. ^{[4
]}

Nelson, K. A. ^{[1
]}

机构：

[1] MIT, Dept Chem, Cambridge, MA 02139 USA

[2] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

[3] CINVESTAV, Unidad Merida, Dept Appl Phys, Merida 97310, Yucatan, Mexico

[4] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa

来源：

APPLIED PHYSICS LETTERS | 2016年 / 109卷 / 15期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

CONSTANTS;

D O I：

10.1063/1.4964709

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the experimental observation of an increase in the elastic anisotropy of tungsten upon He-ion implantation, probed optically using transient grating spectroscopy. Surface acoustic wave (SAW) velocity measurements were performed on a (110) oriented tungsten single crystal as a function of in-plane propagation direction for unimplanted and implanted samples. Our measurements allow us to finely resolve the remarkably small elastic anisotropy of the samples investigated. SAW velocity calculations are used to interpret the experimental data and to extract the Zener anisotropy parameter eta and the elastic constant C-44. Upon ion implantation, we observe an increase in the quantity (eta - 1) by a factor of 2.6. The surprising increase in elastic anisotropy agrees with previous theoretical predictions based on ab initio calculations of the effect of self-interstitial atoms and He-filled vacancy defects on the elastic properties of tungsten. Published by AIP Publishing.

引用

页数：4

共 23 条

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