Pandey, Prafull ; Pantawane, Mangesh V. ; Baler, Nithin ; Ravi, Raju ; Makineni, Surendra Kumar ; Chattopadhyay, Kamanio (2023) Effect of Cr addition on the γ′ strengthened CoNiCrAlMo compositionally complex alloy Materials Science and Technology, 39 (3). pp. 347-361. ISSN 0267-0836
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Official URL: http://doi.org/10.1080/02670836.2022.2114615
Related URL: http://dx.doi.org/10.1080/02670836.2022.2114615
Abstract
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Informa UK Limited |
| Keywords: | Compositionally complex alloys;thermodynamic calculations;partition coefficient;mechanical properties;coarsening kinetics |
| ID Code: | 134996 |
| Deposited On: | 18 Jan 2023 03:54 |
| Last Modified: | 18 Jan 2023 03:54 |
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