Effect of double ion implantation and irradiation by Ar and He ions on nano-indentation hardness of metallic alloys

P. Dayal, D. Bhattacharyya, W. M. Mook, E. G. Fu, Y. Q. Wang, D. G. Carr, O. Anderoglu, N. A. Mara, A. Misra, R. P. Harrison, L. Edwards

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Abstract

In this study, the authors have investigated the combined effect of a double layer of implantation on four different metallic alloys, ODS steel MA957, Zircaloy-4, Ti-6Al-4V titanium alloy and stainless steel 316, by ions of two different species - He and Ar - on the hardening of the surface as measured by nano-indentation. The data was collected for a large number of indentations using the Continuous Stiffness Method or "CSM" mode, applying the indents on the implanted surface. Careful analysis of the data in the present investigations show that the relative hardening due to individual implantation layers can be used to obtain an estimate of the relative hardening effect of a combination of two separate implanted layers of two different species. This combined hardness was found to lie between the square root of the sum of the squares of individual hardening effects, (ΔHA2 + ΔHB2)0.5 as the lower limit and the sum of the individual hardening effects, (ΔHA + ΔH B) as the upper limit, within errors, for all depths measured.Crown

Original languageEnglish (US)
Pages (from-to)108-115
Number of pages8
JournalJournal of Nuclear Materials
Volume438
Issue number1-3
DOIs
StatePublished - 2013

Bibliographical note

Funding Information:
The ion irradiation work at Los Alamos National Laboratory (LANL) was supported through Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by DOE, Office of Science, Office of Basic Energy Sciences, USA. Access to the Center for Integrated Nanotechnologies (CINT) at LANL for nanoindentation is acknowledged. CINT is a DOE, Office of Science, Office of Basic Energy Sciences funded user facility. The help of Pat Dickerson in preparing FIB TEM samples is also greatly appreciated. The enormous help of Tim Palmer and Clint Jennison of the Metallography Lab at the Institute of Materials Engineering in ANSTO in preparing the samples for irradiation is also gratefully acknowledged.

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