Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 31, Issue 10, Pages 1171-1177Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743284715Y.0000000004
Keywords
High entropy alloys; Phase transitions; Kinetics; Precipitation
Funding
- EPSRC/Rolls-Royce Strategic Partnership [EP/H500375/1, EP/M005607/1, EP/H022309/1]
- EPSRC [EP/H500375/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H500375/1, 1147795] Funding Source: researchfish
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The effect of cooling rate on the microstructural evolution of Al0.5CrFeCoNiCu has been studied using differential scanning calorimetry and scanning electron microscopy. As cast Al0.5CrFeCoNiCu contained three phases; Cr-Fe-Co-Ni solid solution dendrites, Cu rich interdendritic material and L1(2) precipitates. During cooling at rates between 10 and 50 degrees C min(-1), an additional exothermic event, at similar to 1010 degrees C, was observed in the heat flow curves. Microstructural examination after cooling revealed the presence of two distinct populations of intragranular precipitates not present in the as cast material. Energy dispersive X-ray spectroscopy indicated that Cu rich precipitates formed within the dendrites, while a Cr-Fe-Co rich phase formed in the interdendritic constituent. Precipitation during cooling at rates approaching 1 degrees C s(-1) indicates that the diffusion kinetics of Al0.5CrFeCoNiCu is not, as previously suggested, sluggish.
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