The effect of temperature on the lattice parameters of phases in twelve nickel-chromiumaluminum (Ni-Cr-Al) alloys and nine cobalt-chromium-aluminum (Cc-Or-Al) alloys was determined using high temperature diffraction (HTXRD). The temperature range was from 25 to 1200°C. The data for each phase of each alloy were computer fit to an empirical thermal expansion equation developed in this study: 25°C and a value for R was derived for each. Excellent fits were obtained for nearly all cases.A comparison of R values revealed that for a given phase ir/r', (3 and O! in Ni-Cr-AI and O!Co and (3 in Co-Cr-AI), R was independent of alloy composition. In the Ni-Cr-AI system
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