CHESS West

In-situ Measurement of Lattice Strain Pole Figures PI: Matt Miller, Cornell University
Schematic of the lattice strain experiment. The station computer controls the shutter, load frame (LF), goniometer (Huber 440), and MAR345 area detector.
Goal: determination of lattice strains and their evolution under mechanical load in multiphase alloys via powder diffraction. Technique: powder diffraction Beamline optics: Si(111), 50 KeV
Schematic showing how "belts" of data are produced by rotating about the specimen TD () axis.	Data from MAR345 area detector showing Debye rings associated with the Fe, Cu, and the reference Ce02 powder.
Experiment setup within the A2 experimental station at CHESS. The electromechanical load frame is shown mounted on the single axis goniometer. The MAR345 area detector can be seen at the right of the figure.		Lattice Strain Pole Figures (from the Fe/Cu -50/50 alloy at 240 MPa.
Publications: M. Miller, J. Bernier, J-S Park, and A. Kazimirov, “Experimental Measurement of Lattice Strain Pole Figures Using Synchrotron X-rays”, Review of Scientific Instruments, 76; 113903-11 (2005) J. Bernier, and M. Miller, “A Direct Method for the Determination of the Mean Orientation-dependent Elastic Strains and Stresses in Polycrystalline Materials from Strain Pole Figures”, Journal of Applied Crystallography, 39; 358 (2006)

2008 Run

Nov 19th - Dec 22nd