Graduate Thesis Or Dissertation
 

The phase diagram of zirconium and chromium with special reference to the transformation in the intermetalic compound ZrCr₂

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  • The zirconium-chromium phase diagram was investigated in the region between 40% and 85% chromium. The ZrCr₂ intermetallic compound which has been the source of some controversy was especially considered. It was found that ZrCr₂ transforms from the low temperature C-15 (MgCu₂, FCC) structure to the high temperature C-14 (MgZn₂, HCP) structure between 1550°C and 1600°C, just the opposite transformation from previously reported results. X-ray diffraction and metallographic methods were used to determine that this transformation is a shear type transformation which occurs on the (111) plane along the [112] direction. The shear mechanism involved in the transformation was determined as a sluggish martensitic transformation.
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