Metalurgija, Vol. 66 No. 1, 2027.
Izvorni znanstveni članak
https://doi.org/https://doi.org/10.64486/m.66.1.2
Investigation of the Solidification Rate in Twin-Roll Cast and Rolled Zr Microalloyed Al-Mg-Si Aluminum Alloys: a Molecular Dynamics Approach
Wenlin Gao
; AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China; Hexing Aeronautical Materials (Tianjin) Technology Co., Ltd., Tianjin 300399, China: Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing 100095, China; Advanced Aluminum Alloy Technology Innovation Center, Beijing 100095, China
Junzhou Chen
; AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China; Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing 100095, China; Advanced Aluminum Alloy Technology Innovation Center, Beijing 100095, China
Ruijue Wang
; Hexing Aeronautical Materials (Tianjin) Technology Co., Ltd., Tianjin 300399, China
Jicheng Wang
; Hexing Aeronautical Materials (Tianjin) Technology Co., Ltd., Tianjin 300399, China
Feng Sun
; Hexing Aeronautical Materials (Tianjin) Technology Co., Ltd., Tianjin 300399, China
Chengning Li
; School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China
Sažetak
The present study investigated the impact of Zr microalloying on the solidification mechanism and rate of cast-rolled Al-Mg-Si aluminum alloy, using differential scanning calorimetry, light microscopy, and PandatTM thermodynamic calculations. The molecular dynamics models of three different systems were established: Al-pure, Al-0.1Zr and Al-0.3Zr. The results revealed that an optimal amount of Zr effectively reduced the nucleation barrier at the atomic level during alloy solidification. This reduction facilitated the formation of critical nuclei, promoted the transformation of hexagonal close-packed clusters into face-centered cubic clusters, altered the mechanism of grain nucleation and growth, and enhanced the solidus temperature of the cast-rolled alloy. Consequently, the temperature range of the solid-liquid two-phase region was narrowed, leading to a substantial in-crease in the alloy’s solidification rate. These atomic-scale findings enhance understanding of Zr's role in solidification control, offering a basis for designing high-performance aluminum alloys and guiding industrial twin-roll casting processes.
Ključne riječi
molecular dynamics; twin-roll casting and rolling; solidification rate; aluminum alloy
Hrčak ID:
350067
URI
Datum izdavanja:
1.1.2027.
Posjeta: 0 *