Revolutionary microstructure control with phase diagram evaluation for the design of E21 Co3AlC-based heat-resistant alloys
Source abstract
Abstract
E21 Co3AlC might be used as a strengthener to develop new Co-based heat-resistant alloys. To establish the basis of microstructure control for further improving mechanical properties, phase equilibria in the CoAl-C ternary system were investigated and phase diagram information particularly related to E21 Co3AlC and liquid phase were evaluated and reconsidered. Single crystals of E21 Co3AlC have been grown successfully for the first time using optical floating zone (OFZ) melting. Extra ordering of carbon atoms taking place in E21 Co3AlC was confirmed using single crystals by transmission electron microscopy. As a result of this ordering, E21 ′ Co3AlC0.5 accompanies formation of antiphase boundaries. A wide variety of the two-phase Co3Alc/α(Co) microstructures were prepared by unidirectional solidification using OFZ.
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Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · Advanced materials and composites · Metallurgical and Alloy Processes
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References (19)
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