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Figure 15
Illustration of the crystallite group method: calculated example. sin2ψ plots for the mechanical (lattice) strain for the crystallite group {211}〈[\bar{1}]11〉 in a copper specimen subjected to a plane biaxial state of stress with [{\sigma _{11}^{\rm S} }] = 100 MPa, [{\sigma _{22}^{\rm S} }] = 200 MPa for three values of φ (lines). The symbols indicate at which combinations of tilt (ψ) and rotation (φ) angles the measurement of the lattice strain by diffraction is possible. As an example, the lattice strain can be measured at sin2ψ = 0.25 and φ = 90°, and at sin2ψ = 0.67 and φ = 0° employing the 220 reflection.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 38| Part 1| January 2005| Pages 1-29
doi:10.1107/S0021889804029516
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