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Orientation informed nanoindentation of α-titanium: Indentation pileup in hexagonal metals deforming by prismatic slip

Published online by Cambridge University Press:  16 December 2011

Claudio Zambaldi ,
Yiyi Yang ,
Thomas R. Bieler  and
Dierk Raabe
Claudio Zambaldi*
Affiliation:
Max-Planck-Institut für Eisenforschung, 40237 Düsseldorf, Germany
Yiyi Yang
Affiliation:
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824-1226
Thomas R. Bieler
Affiliation:
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824-1226
Dierk Raabe
Affiliation:
Max-Planck-Institut für Eisenforschung, 40237 Düsseldorf, Germany
*
a)Address all correspondence to this author. e-mail: c.zambaldi@mpie.de
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Abstract

This study reports on the anisotropic indentation response of α-titanium. Coarse-grained titanium was characterized by electron backscatter diffraction. Sphero-conical nanoindentation was performed for a number of different crystallographic orientations. The grain size was much larger than the size of the indents to ensure quasi-single-crystal indentation. The hexagonal c-axis was determined to be the hardest direction. Surface topographies of several indents were measured by atomic force microscopy. Analysis of the indent surfaces, following Zambaldi and Raabe (Acta Mater. 58(9), 3516–3530), revealed the orientation-dependent pileup behavior of α-titanium during axisymmetric indentation. Corresponding crystal plasticity finite element (CPFE) simulations predicted the pileup patterns with good accuracy. The constitutive parameters of the CPFE model were identified by a nonlinear optimization procedure, and reproducibly converged toward easy activation of prismatic glide systems. The calculated critical resolved shear stresses were 150 ± 4, 349 ± 10, and 1107 ± 39 MPa for prismatic and basal 〈a〉-glide and pyramidal〈c + a〉-glide, respectively.

Keywords

NanoindentationTiDislocations

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Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 1: Focus Issue: Instrumented Indentation , 14 January 2012 , pp. 356 - 367
Copyright
Copyright © Materials Research Society 2011

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