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Dispersoid characteristics and elevated temperature creep resistance of Al–Si–Mg cast alloy with Zr addition.
- Source :
-
Materials Science & Engineering: A . Mar2022, Vol. 836, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- The present work aims to reveal the dispersoids evolution and the valuable role of Zr on the elevated-temperature creep resistance of Al–7Si-0.3Mg alloy. At 300°C and 25 MPa, Al–7Si-0.3Mg-0.15Zr alloy exhibits more than double decrement in the minimum creep rate, and 263 h increment in creep time-to-fracture compared to the Zr-free cast alloy. These effects were owe to the formation of novel nanobelt-like Si 2 Zr and rectangle-like (Al, Si) 3 –Zr dispersoids during solutionising at 560°C for 20 h. The Si atoms could substitute for Al sites to form stable L1 2 -Al 2 Si 1 Zr structure. The thermally stable dispersoids were semi-coherent/coherent with the Al matrix, which impeded the movement of dislocations during creep deformation at 300°C. It demonstrated that the superior creep resistance (300°C) achieved in the Al–7Si-0.3Mg-0.16Zr alloy was attributed to the introduction of novel Zr-containing dispersoids. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HIGH temperatures
*DEBYE temperatures
*ALLOYS
*COLLOIDS
*CREEP (Materials)
Subjects
Details
- Language :
- English
- ISSN :
- 09215093
- Volume :
- 836
- Database :
- Academic Search Index
- Journal :
- Materials Science & Engineering: A
- Publication Type :
- Academic Journal
- Accession number :
- 155149728
- Full Text :
- https://doi.org/10.1016/j.msea.2021.142570