TY - JOUR
T1 - Dispersoid characteristics and elevated temperature creep resistance of Al–Si–Mg cast alloy with Zr addition
AU - Huang, Huilan
AU - Li, Wang
AU - Hu, Chuanbo
AU - Ding, Lipeng
AU - Jia, Zhihong
AU - Zhou, Nan
N1 - This work was financially supported by Science and Technology Development Project of Guangdong academy of science (Grant No. 2020GDASYL-20200103131), Foundation and Applied Foundation Research of Guangdong Province (Grant No. 2019A15151101153), National Natural Science Foundation of China (Grant No. 51871035) and Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51421001).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/3/2
Y1 - 2022/3/2
N2 - 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 Si2Zr 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 L12-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°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.
AB - 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 Si2Zr 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 L12-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°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.
KW - Al-Si-Mg-Zr cast alloys
KW - Dispersoid strengthening
KW - Elevated temperature creep behavior
KW - TEM characterization
UR - http://www.scopus.com/inward/record.url?scp=85123735865&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2021.142570
DO - 10.1016/j.msea.2021.142570
M3 - Journal article
AN - SCOPUS:85123735865
SN - 0921-5093
VL - 836
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 142570
ER -