Synergistic optimization in solidification microstructure and mechanical performance of novel (TiCₓNy − TiB₂)p/Al nanocomposites: Design, tuning and mechanism

Document Type

Journal Article

Publication Title

Composites Part A: Applied Science and Manufacturing

Volume

155

Publisher

Elsevier

School

School of Engineering

RAS ID

42849

Funders

National Natural Science Foundation of China (No. 51971101),

Scientific research project of Jilin Provincial Department of Education (JJKH20211065KJ),

Guangdong Basic and Applied Basic Research Foundation, China (2019A1515110268),

Exploration Foundation of State Key Laboratory of Automotive Simulation and Control (ascl-zytsxm-202015)

Graduate Innovation Fund of Jilin University (No.101832020CX139)

Comments

Dong, B. X., Li, Q., Yang, H. Y., Liu, T. S., Qiu, F., Shu, S. L., ... & Zhang, L. C. (2022). Synergistic optimization in solidification microstructure and mechanical performance of novel (TiCxNy− TiB2) p/Al nanocomposites: design, tuning and mechanism. Composites Part A: Applied Science and Manufacturing, 106843.

https://doi.org/10.1016/j.compositesa.2022.106843

Abstract

Tuning solidification microstructure remains a grand challenge for ceramic particles reinforced Al-Si based composites due to adverse interactions between ceramic particles and Si-containing melts. This work proposed a novel in-situ synthesis strategy of designing master alloys decorated with well-dispersed TiCxNy and TiB₂ particles to synergistically optimize the Al-Si based composites. By adjusting the reactant contents and ratios, near-spherical nano-sized TiCₓNy particles and hexagonal submicron-sized TiB2 particles were obtained in as-synthesized Al-(TiCₓNy-TiB₂)p master alloys. The effects of this pre-dispersed agent on solidification kinetics, microstructure features and mechanical performance evolution of the Al-10Si-2Mg composites were investigated in detail. TiCₓNy-TiB₂ particles could trigger the heterogeneous nucleation of primary α-Al crystals, and the growth-restricting effects also contributed to grain refinement, which finally accounted for the enhancement in both strength and ductility. This work is expected to provide new guidance for selection of reinforcing particles and synergistic optimization of the solidification microstructure and performance.

DOI

10.1016/j.compositesa.2022.106843

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