高能球磨工艺对B<sub>4</sub>C/Al复合粉体结构演变及分布均匀性的影响

doi:10.11896/j.issn.1005-023X.2018.15.017

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Abstract The main difficulties of preparing the B₄C reinforced Al matrix composite are uniform distribution and interfacial bonding of B₄C particles in Al matrix. In this study, the composite powder of B₄C/Al was fabricated by high-energy ball milling. The effects of rotational speed and milling time on structural evolution and uniform distribution of B₄C/Al composite powder were investigated. The results indicate that as the rotational speed up, the composite powder gain more energy from collision with the ball. In addition, the reinforced particles are broken instantly, which lead to large plastic deformation of Al matrix. With the extension of mil-ling time, the broken B₄C particles are gradually uniformly distributed in Al matrix and bond with the matrix. This is conducive to uniform distribution and interfacial bonding of the powder. During process of milling, brittle fracture of B₄C particles happen along the edge. When the shape of Al powder change from spherical to lamella, B₄C particles are embedded in Al matrix, forming a composite powder where B₄C reinforcements are wrapped in the flaky Al matrix powder. When the rotational speed is 600/800 r/min (alternating speed with alternating frequency of 1 min) and the milling time is 2 h, the size of B₄C/Al composite powder is refined, and B₄C particles are uniformly distributed in Al matrix with strong interfacial bonding.

Key words： B₄C/Al composite powder uniform distribution interfacial bonding mill parameters

Published: 09 August 2018

CLC number:

TB333

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	Articles by authors
	ZHANG Xiuchao
	CAI Xiaolan
	ZHOU Lei
	QIAO Yingbo
	WU Can
	ZHANG Shuang
	ZHU Wei

Cite this article:

ZHANG Xiuchao,CAI Xiaolan,ZHOU Lei, et al. Effect of Ball Milling Technics on Structural Evolution and Uniform Distribution of B₄C/Al Composite Powder[J]. Materials Reports, 2018, 32(15): 2653-2658.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.15.017 OR http://www.mater-rep.com/EN/Y2018/V32/I15/2653

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