Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 858, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157659
Keywords
Ultrasound; Casting; B4Cp/al composites; TiB2; Nucleation
Categories
Funding
- National Natural Science Foundation of China [51974224, 51604211]
- Natural Science Foundation of Shaanxi Province [2020JM-047]
- Fundamental Research Funds for Central Universities [Xjj2018002, xtr0118008]
- Jiangsu Province Key Laboratory of High-end Structural Materials [Hsm1902]
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Ultrasound assisted casting method was used to prepare B4Cp/Al composites rapidly, aiming for homogeneous microstructure and improved mechanical properties. The ultrasound effect promoted nucleation and growth of TiB2 phase, forming a continuous TiB2 layer, leading to enhanced performance of the composites.
Ultrasound assisted casting method was applied in the rapid preparation of B4Cp/Al composites with the aim of obtaining homogeneous microstructure and improving mechanical properties with higher stability of composites. The process involved that the mixed B4C and K2TiF6 were added into molten Al at 800 degrees C, and then high-intensity ultrasound was introduced into the melt through an ultrasonic probe for 5 min. Experimental results showed that besides uniform distribution of B4C particles, a more homogeneous and continuous TiB2 layer could be formed on B4C particle surface due to the effects of ultrasound, which was beneficial for improving the dispersity and hindering the decomposition of B4C particle in the Al melt. Since the undercooling of melt and enhancement of diffusion of solutes could be induced by ultrasound, the nucleation and growth of TiB2 phase were effectively promoted, leading to the rapid formation of homogeneous TiB2 layer. Compared with the sample treated without ultrasound, the strength, ductility and performance stability of ultrasonically treated sample were improved significantly. (C) 2020 Elsevier B.V. All rights reserved.
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