Effect of Cr addition on the γ′ strengthened CoNiCrAlMo compositionally complex alloy
| Autor: | Pandey, Prafull, Pantawane, Mangesh V., Baler, Nithin, Ravi, Raju, Makineni, Surendra Kumar, Chattopadhyay, Kamanio |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Materials Science and Technology. 39:347-361 |
| ISSN: | 1743-2847 0267-0836 |
| DOI: | 10.1080/02670836.2022.2114615 |
| Popis: | The present study illustrates the effect of varying Cr content in Co51-xNi30Al10Mo5Nb2Ti2Crx (x = 2, 5, and 8 at.-%) compositionally complex alloys (CCAs). STEM-EDS analysis suggests a change in Mo partitioning from equal in both the phases (γ and γ′) in CCA-2Cr to the γ phase in CCA-5Cr and CCA-8Cr alloys. This peculiar compositional partitioning with Cr content beyond 2% brings a change in γ′ precipitate morphology from cuboidal to spheroidal in CCAs. The shape change-induced reduction in strain energy rendered a decrease in γ′ coarsening rate by ∼ 1/2, i.e. from 11.5 to 4.6 nm3/s in the CCA-2Cr and CCA-8Cr alloys, respectively. All three alloys show an anomalous increase in 0.2% proof stress (PS) with temperature and achieve peak values at 770°C. |
| Databáze: | OpenAIRE |
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