The Scintag Polycrystalline-Texture-Stress (PTS) 4-axis goniometer with high-flux rotating anode x-ray source is designed to permit mapping of the residual stress state across the surface of a specimen, accurately measure strains in ceramics, and perform grazing incidence x-ray diffraction. This instrument permits measurement of either biaxial or triaxial residual strains in ceramics and alloys. Strain tensors are subsequently converted to stress tensors utilizing the elastic constants of the phase. The RSUC facilities also enable determination of diffraction elastic constants and to directly measure on a phase by phase basis the response of materials to applied loads.

The rugged open Eulerian cradle of the PTS goniometer allows the study of large specimens over a wide tilt and Bragg angle range. The tower of the rotating anode x-ray generator is shown to the right.

Features:

• High-flux, high-brilliance 18-kW rotating anode source with interchangeable anodes (Cu, Cr, Ni, Co, Fe)
• Divergent or near-parallel beam optics
• Unrestricted 2-theta range (from -2 to 162 degrees)
• Specimen dimensions up to 140 mm in diameter, 40 mm in thickness, and 5 kg in mass
• Sample X, Y, and Z translations
• Solid-state detection of x-rays yields high peak-to-background ratios
• Optional position-sensitive detector available for rapid data collection
• Highly automated, flexible data-collection options include psi or omega tilts
• Software includes profile fitting of peak position, biaxial and triaxial stress analysis, pole figure presentation, and orientation distribution function calculations
• Grazing incidence x-ray diffraction for depth profiling of stress and phase content
• Load cells for determination of diffraction elastic constants and furnaces for elevated temperature measurement of residual strain are being developed