Al-Pb-Sn alloy is rapidly solidified by using the high-pressure gas-atomization technique. A model describing the microstructure evolution in an atomized drop is developed. This model takes into account the concurrent actions of the nucleation, diffusional growth, spatial motions of the minority-phase droplets, and the solidification of the matrix liquid. The microstructure formation in the gas-atomized drop is simulated by coupling the thermodynamic and kinetic calculations. The numerical results show a favorable agreement with the experimental results. They demonstrate that under the rapid cooling conditions of gas atomization, the spatial phase separation due to the Marangoni migration of the minority-phase droplets mainly affects the microstructure formation in a small region close to the atomized drop surface. All the minority-phase droplets are nucleated during the liquid-liquid phase decomposition period. For an Al-(5-9) wt pct Pb-3 wt pct Sn alloy, the average radius and number density of the minority-phase particles depend exponentially on the powder diameter. The microstructure formation process is discussed in detail.
部门归属
[zhao, lei; zhao, jiuzhou] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china.;zhao, l (reprint author), chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china.;zhaolei@imr.ac.cn
L. Zhao,J. Z. Zhao. Microstructure Formation in a Gas-Atomized Drop of Al-Pb-Sn Immiscible Alloy[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2012,43A(13):5019-5028.
APA
L. Zhao,&J. Z. Zhao.(2012).Microstructure Formation in a Gas-Atomized Drop of Al-Pb-Sn Immiscible Alloy.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,43A(13),5019-5028.
MLA
L. Zhao,et al."Microstructure Formation in a Gas-Atomized Drop of Al-Pb-Sn Immiscible Alloy".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 43A.13(2012):5019-5028.
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