Abstract
The time-of-flight diffractometer Epsilon-MDS at the modernised pulsed reactor IBR-2M at Dubna is designed for the detection of residual and applied strains in polycrystalline materials. The instrument allows the recording of diffraction patterns with high resolution (Δd/d = 5×l0−3 to the best) over a wide wavelength band (λmax = 7.8 Å; d max = 5.6 Å). Complicated polyphase materials like rocks consisting of minerals with large unit cells and low crystal symmetry can be investigated. The diffractometer is equipped with 81 detectors positioned behind nine radial collimators at a unique Bragg angle of 2θ = 90° for the central detector and at different radial angles allowing the simultaneous measurement of nine sample directions. A pressure device for the in situ investigation of intra-crystalline strain under uniaxial load up to 150 MPa on cylindrical samples is available. The macroscopic strain on the sample surface can be determined simultaneously by means of a laser extensometer. The sample can be rotated around its axis, i.e. limited information on texture can be obtained. The simultaneous strain and CPO measurements are helpful for a better understanding of the deformational behaviour of polycrystalline materials, e.g. to investigate elastic processes in rocks before, during and after rock failure.
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