Intragranular Residual Stress Evaluation Using the Semi-Destructive FIB-DIC Ring-Core Drilling Method

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Titanium aluminide (TiAl) is a lightweight intermetallic compound with a range of exceptional mid-to-high temperature mechanical properties. These characteristics have the potential to deliver significant weight savings in aero engine components. However, the relatively low ductility of TiAl requires improved understanding of the relationship between manufacturing processes and residual stresses in order to expand the use of such components in service. Previous studies have suggested that stress determination at high spatial resolution is necessary to achieve better insight. The present paper reports progress beyond the current state-of-the-art towards the identification of the near-surface intragranular residual stress state in cast and ground TiAl at a resolution better than 5μm. The semi-destructive ring-core drilling method using Focused Ion Beam (FIB) and Digital Image Correlation (DIC) was used for in-plane residual stress estimation in ten grains at the sample surface. The nature of the locally observed strain reliefs suggests that tensile residual stresses may have been induced in some grains by the unidirectional grinding process applied to the surface.

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Edited by:

M. François, G. Montay, B. Panicaud, D. Retraint and E. Rouhaud

Pages:

8-13

DOI:

10.4028/www.scientific.net/AMR.996.8

Citation:

A. J.G. Lunt and A. M. Korsunsky, "Intragranular Residual Stress Evaluation Using the Semi-Destructive FIB-DIC Ring-Core Drilling Method", Advanced Materials Research, Vol. 996, pp. 8-13, 2014

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August 2014

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[1] M. Goral, et al., Diffusion aluminide coatings for TiAl intermetallic turbine blades, Intermetallics. 19(5) (2011) 744-747.

DOI: 10.1016/j.intermet.2010.12.015

[2] A.T. Yokobori, et al., The characterization of creep crack growth rate and its life of TiAl inter-metallic compound with full lamellar microstructure, INT J PRES VES PIP. 78(11-12) (2001) 757-764.

DOI: 10.1016/s0308-0161(01)00087-4

[3] G.S. Schajer, Advances in Hole-Drilling Residual Stress Measurements, Experimental Mechanics. 50(2) (2010) 159-168.

DOI: 10.1007/s11340-009-9228-7

[4] F. Hofmann, et al., Analysis of strain error sources in micro-beam Laue diffraction, NUCL INSTRUM METH A. 660(1) (2011) 130-137.

[5] M. Krottenthaler, et al., A simple method for residual stress measurements in thin films by means of focused ion beam milling and digital image correlation, SURF COAT TECH. 215 (2013) 247-252.

DOI: 10.1016/j.surfcoat.2012.08.095

[6] A.M. Korsunsky, M. Sebastiani and E. Bemporad, Focused ion beam ring drilling for residual stress evaluation, Materials Letters. 63(22) (2009) 1961-(1963).

DOI: 10.1016/j.matlet.2009.06.020

[7] M. Sebastiani, et al., Depth-resolved residual stress analysis of thin coatings by a new FIB-DIC method, MAT SCI ENG A-STRUCT. 528(27) (2011) 7901-7908.

DOI: 10.1016/j.msea.2011.07.001

[8] K. Tanaka and M. Koiwa, Single-crystal elastic constants of intermetallic compounds, Intermetallics. 4 (1996) 29-39.

[9] F.P.E. Dunne, A. Walker and D. Rugg, A systematic study of hcp crystal orientation and morphology effects in polycrystal deformation and fatigue, P R SOC A. 463(2082) (2007) 1467-1489.

DOI: 10.1098/rspa.2007.1833

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