Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 836, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142570
Keywords
Al-Si-Mg-Zr cast alloys; Dispersoid strengthening; Elevated temperature creep behavior; TEM characterization
Categories
Funding
- Science and Technology Development Project of Guangdong academy of science [2020GDASYL-20200103131]
- Foundation and Applied Foundation Research of Guangdong Province [2019A15151101153]
- National Natural Science Foundation of China [51871035]
- Innovative Research Groups of the National Natural Science Foundation of China [51421001]
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The present study reveals the valuable role of Zr on the elevated temperature creep resistance of Al-7Si-0.3Mg alloy. By introducing novel Zr-containing dispersoids during solutionizing, the creep rate is significantly reduced and the time-to-fracture is extended.
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 degrees 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 Si2Zr and rectangle-like (Al, Si)(3)-Zr dispersoids during solutionising at 560 degrees C for 20 h. The Si atoms could substitute for Al sites to form stable L1(2)-Al2Si1Zr structure. The thermally stable dispersoids were semi-coherent/coherent with the Al matrix, which impeded the movement of dislocations during creep deformation at 300 degrees C. It demonstrated that the superior creep resistance (300 degrees C) achieved in the Al-7Si-0.3Mg-0.16Zr alloy was attributed to the introduction of novel Zr-containing dispersoids.
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