Solidification behavior and microstructural features of the cast and HIPed N-bearing Ti–48Al–2Cr–2Nb intermetallic alloys
Source abstract
Abstract
Copyright © 2023 The Author(s). Effect of N addition (0.5, 1, and 2 at. %) on solidification behavior and microstructural features of the cast and hot isostatically pressed (HIPed) Ti–48Al–2Cr–2Nb (4822) intermetallic alloy was investigated. Alloys were fabricated using vacuum arc re-melting followed by HIPing. The results showed that N addition changes the primary β phase dendrites to α phase. The morphological uniformity of the as-cast microstructures was notably increased by N addition. In addition, N addition beyond its solubility limit led to the formation of primary Ti2AlN precipitates located within lamellar colonies. A possible mechanism for nucleation of the Ti2AlN precipitates is proposed. Furthermore, N addition caused much more microstructure stability during HIPing. Although a duplex structure was formed after HIPing in the 4822 alloy, N addition decreased the formation of this structure. Moreover, highly extended network of secondary Ti2AlN precipitates were formed in almost all of (α2+γ) lamellas interfaces in the N-bearing alloys.
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Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · Metal and Thin Film Mechanics · Titanium Alloys Microstructure and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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