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Local lattice distortions and chemical short-range order in MoNbTaW
- Source :
- Materials Research Letters, Vol 12, Iss 5, Pp 346-354 (2024)
- Publication Year :
- 2024
- Publisher :
- Taylor & Francis Group, 2024.
-
Abstract
- Extended X-ray absorption fine structure (EXAFS) conducted on an equiatomic MoNbTaW bcc medium-entropy alloy that was annealed at 2273 K reveals unexpectedly small 1st and 2nd shell element-specific lattice distortions. An experimental size-mismatch parameter, [Formula: see text], is determined to be ca. 50% lower than the corresponding calculated value. Around W, short-range order (SRO) preferring 4d elements in the 1st and 2nd shells persists. A Nb-W ordering is found, which is reminiscent of ordering emerging at lower temperatures in the B2(Mo,W;Ta,Nb)- and B32(Nb,W)-phases. With high-temperature ordering preferences in fcc also foreshadowing low-temperature phase, these findings suggest a general feature of high-temperature SRO.
Details
- Language :
- English
- ISSN :
- 21663831
- Volume :
- 12
- Issue :
- 5
- Database :
- Directory of Open Access Journals
- Journal :
- Materials Research Letters
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.5af9170bf2240fda1bfe9a24b63ad76
- Document Type :
- article
- Full Text :
- https://doi.org/10.1080/21663831.2024.2326014