Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 9    September 2016

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Fabrication and characterization of stir casting AA6061-31%B4C composite
Yu LI1,2, Qiu-lin LI1, Dong LI1,2, Wei LIU2, Guo-gang SHU3

1. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;
2. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
3. Nuclear Materials Joint Laboratory, Tsinghua University, Shenzhen 518055, China

Abstract:A sophisticated stir casting route to fabricate large scale AA6061-31%B4C composite was developed. Key process parameters were studied, microstructure and mechanical properties of the composite were investigated. The results indicated that vacuum stirring/casting, B4C/Mg feeding and ingots cooling were essential to the successful fabrication of AA6061-31%B4C composite. Chemical erosion examination verified the designed B4C content; X-ray fluorescence spectrometer (XFS) showed the chemical composition of Mg and Si in the matrix conformed to industry standards; scanning electronic microscope (SEM) and X-ray diffraction (XRD) revealed that B4C particles were evenly distributed in the composites with well dispersed Mg2Si precipitates. Tensile testing results showed that the AA6061-31%B4C composite had a tensile strength of 340 MPa, improved by 112.5% compared with AA1100-31%B4C composite, which is attributed to the enhanced strength of the matrix alloy.

 

Key words: Al-B4C alloy; metal matrix composite; stir casting; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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