Synergistic Effect of La and TiB2 Particles on Grain Refinement in Aluminum Alloy

Zhang, Lili; Song, Yan; Yang, Linjie; Zhao, Jiuzhou; He, Jie; Jiang, Hongxiang

doi:10.3390/ma15020600

Open AccessArticle

Synergistic Effect of La and TiB₂ Particles on Grain Refinement in Aluminum Alloy

by

Lili Zhang

^1,*,†,

Yan Song

^1,2,†,

Linjie Yang

^1,2,

Jiuzhou Zhao

^1,2,*,

Jie He

^1,2 and

Hongxiang Jiang

^1,2

¹

Shi-Changxu Innovation Centre for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

²

School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

^*

Authors to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Materials 2022, 15(2), 600; https://doi.org/10.3390/ma15020600

Submission received: 10 December 2021 / Revised: 24 December 2021 / Accepted: 26 December 2021 / Published: 13 January 2022

(This article belongs to the Topic Metallurgical and Materials Engineering)

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Abstract

Synergistic effect of TiB₂ (in form of Al-5Ti-1B) and La on grain refining results in Al-2Cu alloy was investigated. α-Al grains are significantly refined by Al-5Ti-1B. When trace La is added to the melt, further refinement is exhibited. Average grain size and nucleation undercooling of α-Al reduce first and then almost remain unchanged with La addition. Satisfactory grain refining result achieves when La addition level reaches 600 ppm. When more than 600 ppm La is added to the melt, La-rich particles form and the effect of solute La left in matrix on the microstructure almost no longer changes. Theoretical calculation results demonstrate that solute La segregates to Al melt/TiB₂ particles interface along with Ti and Cu prior to α-Al nucleation and the synergistic effect of La and TiB₂ particles on grain refinement mainly attributes to the enhancement in the potency of TiB₂ particles to heterogeneously nucleate α-Al by trace La addition.

Keywords: grain refinement; microstructure; segregation; heterogeneous nucleation; metals and alloys

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MDPI and ACS Style

Zhang, L.; Song, Y.; Yang, L.; Zhao, J.; He, J.; Jiang, H. Synergistic Effect of La and TiB₂ Particles on Grain Refinement in Aluminum Alloy. Materials 2022, 15, 600. https://doi.org/10.3390/ma15020600

AMA Style

Zhang L, Song Y, Yang L, Zhao J, He J, Jiang H. Synergistic Effect of La and TiB₂ Particles on Grain Refinement in Aluminum Alloy. Materials. 2022; 15(2):600. https://doi.org/10.3390/ma15020600

Chicago/Turabian Style

Zhang, Lili, Yan Song, Linjie Yang, Jiuzhou Zhao, Jie He, and Hongxiang Jiang. 2022. "Synergistic Effect of La and TiB₂ Particles on Grain Refinement in Aluminum Alloy" Materials 15, no. 2: 600. https://doi.org/10.3390/ma15020600

APA Style

Zhang, L., Song, Y., Yang, L., Zhao, J., He, J., & Jiang, H. (2022). Synergistic Effect of La and TiB₂ Particles on Grain Refinement in Aluminum Alloy. Materials, 15(2), 600. https://doi.org/10.3390/ma15020600

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Synergistic Effect of La and TiB₂ Particles on Grain Refinement in Aluminum Alloy

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