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Synthesis of nanoscale spherical TiB2 particles in Al matrix by regulating Sc contents

Published online by Cambridge University Press:  30 January 2019

Jing Sun*
Affiliation:
Research and Development Department, Shanghai Aerospace Equipment Manufacturer Limited Company, Shanghai 200245, China; and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Xuqin Wang
Affiliation:
Research and Development Department, Shanghai Aerospace Equipment Manufacturer Limited Company, Shanghai 200245, China
Lijie Guo
Affiliation:
Research and Development Department, Shanghai Aerospace Equipment Manufacturer Limited Company, Shanghai 200245, China
Xiaobo Zhang
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Haowei Wang
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: 15216615475@163.com
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Abstract

In situ TiB2 particles with polyhedral or near-spherical morphology with more high-index crystal planes exposed were prepared by controlling the addition amount of Sc in commercial pure aluminum matrix. As the content of Sc increased, TiB2 morphology transformed from hexagonal platelets to polyhedral or near-spherical morphology with a decrease in particle size. In the present paper, a simple method to prepare near-spherical in situ TiB2 particles in Al matrix was explored and it was found that the reinforcement distribution was improved significantly. The different growth mechanism of TiB2 particles in Al and Al–Sc systems was discussed. The key reason for the morphology evolution was that the Sc was preferentially adsorbed on ${\bf \left\{ {1{\bf \overline{2}}12} \right\}}$, ${\bf \left\{ {11\overline{2}0} \right\}}$, and ${\bf \left\{ {10\overline{1}1} \right\}}$ which would inhibit the growth of these faces effectively and retain a lower-energy state of the polyhedral or quasispherical TiB2 particles in Al–Sc systems.

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Article
Copyright
Copyright © Materials Research Society 2019 

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