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Title: Interfacial microstructure in a B{sub 4}C/Al composite fabricated by pressureless infiltration.

Interfacial microstructure in a B{sub 4}C/Al composite fabricated by pressureless infiltration. In this work, B{sub 4}C particulate-reinforced Al composite was fabricated by a pressureless infiltration technique, and its interfacial microstructure was studied in detail by X-ray diffraction as well as by scanning and transmission electron microscopy. The B{sub 4}C phase was unstable in Al melt during the infiltration process, forming AlB{sub 10}-type AlB{sub 24}C{sub 4} or Al{sub 2.1}B{sub 51}C{sub 8} as a major reactant phase. The Al matrix was large grains (over 10 {micro}m), which had no definite orientation relationships (ORs) with the randomly orientated B{sub 4}C or its reactant particles, except for possible nucleation sites with {l_brace}011{r_brace}{sub B{sub 4}C} almost parallel to {l_brace}111{r_brace}{sub Al} at a deviation angle of 1.5 deg. Both B{sub 4}C-Al and reactant-Al interfaces are semicoherent and free of other phases. A comparison was made with the SiC/Al composite fabricated similarly by the pressureless infiltration. It was suggested that the lack of ORs between the Al matrix and reinforced particles, except for possible nucleation sites, is the common feature of the composites prepared by the infiltration method.
Authors: ; ; ; ; ;
Publication Date:
OSTI Identifier:1041379
Report Number(s):ANL/MSD/JA-73353
Journal ID: ISSN 1073-5623; MMTAEB; TRN: US201211%%542
DOE Contract Number:DE-AC02-06CH11357
Resource Type:Journal Article
Resource Relation:Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science; Journal Volume: 43; Journal Issue: 1
Research Org:Argonne National Laboratory (ANL)
Sponsoring Org:SC
Country of Publication:United States
Language:ENGLISH
Subject: 36 MATERIALS SCIENCE; MICROSTRUCTURE; NUCLEATION; ORIENTATION; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION