首页|Substantial grain refinement of Al-Mn-Si alloys mediated by collaborative effect of Al-5Ti-1B refiner and sub-rapid solidification

Substantial grain refinement of Al-Mn-Si alloys mediated by collaborative effect of Al-5Ti-1B refiner and sub-rapid solidification

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The mechanical properties of as-cast metallic materials depend strongly on the size and shape of grains,which are critical microstructural parameters dictated by the interplay of nucleation and growth of crys-talline solids during solidification.In our experiments,the microstructure transition from coarse colum-nar crystals into fine equiaxed crystals for dilute Al-Mn-Si alloys was achieved by using sub-rapid so-lidification with the addition of Al-5Ti-1B grain refiner.The average grain size of Al alloy was reduced from a millimeter size to 73 pm.Through temperature gradient calculation,we found that the acqui-sition of fine equiaxed crystals could be attributed to the existence of a high number density of TiB2,acting as effective nucleation sites with an increase in total undercooling.Furthermore,the curvature su-percooling,constitutional undercooling,thermal undercooling,and kinetic undercooling during sub-rapid solidification were quantitatively determined for given solidification rates.Our results showed that con-stitutional undercooling,rather than thermal undercooling,was primarily responsible for the formation of fine equiaxed grains,with the assistance of Al-5Ti-1B grain refiner.This work provides a new insight into the grain refining mechanism under sub-rapid solidification.

Aluminum alloysSub-rapid solidificationColumnar-to-equiaxed transitionGrain refinement

Yong-Si Wei、Cheng Wang、Jiang You、Dong Qiu、Yipeng Gao、Hong Xu、Jin Xu、Hui-Yuan Wang

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Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering,Nanling Campus,Jilin University,No.5988 Renmin Street,Changchun,130025,China

Center for Additive Manufacturing,School of Engineering,RMIT University,Melbourne,VIC,3001,Australia

State Key Laboratory of Reliability and Intelligence of Electrical Equipment,School of Material Science and Engineering,Hebei University of Technology,Tianjin,300130,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development ProgramInterdisciplinary Integration and Innovation Project of JLUFundamental Research Funds for the Central Universities,JLU

5222240952074132U19A2084U22A201092022YFE0122000JLUXKJC2021ZZ08

2024

10.1016/j.jmst.2023.11.025

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.187(20)
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