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Formation mechanism of ultrafine α+β structure in Ti-6Al-4V alloy during β→αm→α+β continuous phase transformation.
- Source :
-
Scripta Materialia . Jun2024, Vol. 246, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Although massive transformation has been increasingly observed in titanium alloys, the decomposition mechanism of the massive transformation product (α m) is still unclear. Here, the β→α m →α+β continuous phase transformation in Ti-6Al-4V alloy during cooling was studied. We found that massive transformation occurs at a moderate cooling rate below 291.5 °C/s, forming irregular featureless α m. The thermodynamically unstable α m is supersaturated with β stabilizers, and it tends to decompose into ultrafine α+β structure during the continuous cooling at ever-lower cooling rates and temperatures. In the initial stage of α m decomposition, misfit dislocations appear as a predecessor and split α m into strips. Accompanied by the elemental redistribution, misfit dislocations are accommodated and replaced by β phase. Both the formation and decomposition of α m follow the typical Burgers orientation relationship. [Display omitted] [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHASE transitions
*ALLOYS
*TITANIUM alloys
*COOLING
Subjects
Details
- Language :
- English
- ISSN :
- 13596462
- Volume :
- 246
- Database :
- Academic Search Index
- Journal :
- Scripta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 176270220
- Full Text :
- https://doi.org/10.1016/j.scriptamat.2024.116066