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A D V A N C E D M A T E R I A L S & P R O C E S S E S | A P R I L 2 0 1 6
2 4
CONCLUSIONS
The loading direction for α+β tita-
nium alloy wire affects the activation
of prism slip bands, presumably due to
the titanium wire having preferred crys-
tallographic texture. Similarly, solution
quenched and aged microstructures are
more resistant to {1011} slip band forma-
tion. The interplay of these mechanisms
is likely important in dictating inherent
material strength, and therefore, in the
material selection and optimization pro-
cess for a given application.
These high speed, high fidelity
techniques for analyzing texture and
dislocation content enable greater un-
derstanding of the influence of texture
on deformation of complex titanium
engineering alloys than previously
possible. This information can be used
to validate meso-scale microstructure
modeling such as crystal plasticity and
finite element models that track aniso-
tropic grain behavior. Thesemodels can
work in conjunction with other models
to predict macroscopic physical prop-
erties such as strength, fatigue life, and
creep behavior. ~AM&P
For more information: J.W. Foltz is
principal research metallurgist, ATI
Specialty Alloys and Components,
1600 Old Salem Rd., Albany, OR 97321,
541.926.4211, ,
.
References
1. R.J. Kamaladasa and Y.N. Picard,
Basic Principles and Application of
Electron Channeling in a Scanning
Electron Microscope for Dislocation
Analysis, Microscopy: Science, Technolo-
gy, Applications and Education, (Eds. A.
Mendez-Vilas and J. Diaz), Formatex,
p 1583-1590, 2010.
2. T.R. Bieler, et al., Grain Boundaries
and Interfaces in Slip Transfer, Current
Opinion in Solid State and Materials
Science, (18), p 212-226, 2014.
3. A.J. Wilkinson and D. Randman,
Determination of Elastic Strain Fields
and Geometrically Necessary Dislo-
cation Distributions Near Nanoin-
dents Using Electron Back Scatter
Diffraction, Philosophical Magazine,
90(9), p 1159-1177, 2010,
4. J.F. Nye, Physical Properties of Crys-
tals: Their Representation by Tensors
and Matrices, Oxford University Press,
1987.
5. J. Nye, Some Geometrical Relations
in Dislocated Crystals, Acta Met.,
1(2), p 153-162, 1953, http://doi.
org/10.1016/0001-6160(53)
90054-6.
6. W. Pantleon, Resolving the Geometri-
cally Necessary Dislocation Content by
Conventional Electron Backscattering
Diffraction, Scripta Matl., 58(11),
p 994-997, 2008,
7. A.J. Wilkinson, et al., High-Resolution
Elastic Strain Measurement from Elec-
tron Backscatter Diffraction Patterns:
New Levels of Sensitivity, Ultramicros-
copy, 106 (4-5), p 307-13, 2006,
8. A.J. Wilkinson, et al., High-Resolu-
tion Electron Backscatter Diffraction:
An Emerging Tool for Studying Local
Deformation, J. Strain Anal. for Eng.
Design, 45 (5), p 365-376, 2010.
ATI 6-4 and ATI 3-2.5 alloys are
trademarks, and ATI 425 alloy is a
registered trademark of ATI Properties
Inc., Pittsburgh.
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