High-temperature phase equilibria in Cr-Cr3Si two-phase alloys |
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| Authors: | J- A Sutlijfand B P Bewlay and H A Lipsitt |
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| Affiliation: | (1) Corporate Research and Development Center, General Electric Company, 12301 Schenectady, NY;(2) Department of Mechanical and Materials Engineering, Wright State University, 45435 Dayton, OH |
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| Abstract: | Phase equilibria in two-phase Cr-Cr3Si alloys have been investigated using metallography, XRD, and electron microprobe analysis. Cr-Si alloys with compositions
of up to 15.0% Si were directionally solidified using cold crucible Czochralski crystal growth and equilibrated chemically
at either 1200,1400, or 1600 °C. Measured Si concentrations of the Cr and the Cr3Si phases were found to be significantly lower than those given by the most recent assessment of the Cr-Si phase diagram,
particularly at temperatures above 1200 °C. This explains why the volume fraction of Cr3Si in the directionally solidified eutectic is lower than that predicted by the assessed phase diagram. X-ray lattice parameter
data for both Cr and Cr3Si are also reported. |
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