Novel approach to characterize the deformation under Berkovich and spherical indentations: Study on magnesium single crystals

Raineesh, K. P. and Sairam, K. and Rajesh, K. and Prasad, K. Eswar (2021) Novel approach to characterize the deformation under Berkovich and spherical indentations: Study on magnesium single crystals. Physical Review Materials, 5 (8). ISSN 2475-9953

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Abstract

In this work, we have developed a mathematical framework to investigate the deformation response under Berkovich and spherical indenters. Nanoindentation experiments are carried out on two single-crystal magnesium (Mg) samples oriented for basal slip and tensile twinning. The indentation load vs penetration depth curves are then analyzed to explain the pop-in events with the help of Schmid factor analysis and to identify the favorable deformation modes directly beneath and around the indentation. These results explain why there is only a small difference in the values of hardness between the two orientations despite having a significant difference in their crystallographic orientations. In addition to this, the role of indenter tip radius on the formation of extension twins when indented along the crystallographic c axis is analyzed with the help of a simple analytical model.

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IITH Creators:

IITH Creators	ORCiD
Sairam, K.	UNSPECIFIED
Rajesh, K.	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Crystallographic orientations; Deformation response; Indenter tip radius; Magnesium single crystals; Mathematical frameworks; Nanoindentation experiments; Spherical indentations; Spherical indenters

Subjects:

Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

23 Sep 2021 04:07

Last Modified:

23 Sep 2021 04:07

URI:

http://raiithold.iith.ac.in/id/eprint/8825