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Indexed by:期刊论文

Date of Publication:2014-05-27

Journal:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Included Journals:SCIE、EI、Scopus

Volume:605

Page Number:301-309

ISSN No.:0921-5093

Key Words:In situ composites; TiB2 particles; Microstructure; Mechanical properties

Abstract:In Part I of the two part study, an improved halide salt route was developed to fabricate in situ TiB2 particulate reinforced aluminum matrix master composites based on the well-established flux assisted synthesis (FAS) method using mechanical stirring. By microstructural and element-recovery analysis, we show how the simple but effective "improved method" - leaving the reactant molten salt on the surface of aluminum melt without introducing any stirring during holding - influences the mechanical performance of the final composites. Processing parameters in terms of holding duration, reaction temperature and stirring speed before casting were optimized to produce Al-5 wt% TiB2 composite with consistent and sound quality. The experimental Al-5TiB(2) composite, prepared under the improved halide salt route condition, has achieved a 140% improvement in the UTS without compromising its ductility with respect to the Al matrix. The experimental validation of using the developed Al-5TiB(2) composite as a master composite to reinforce aluminum foundry alloys will be presented in Part II. (C)2014 Elsevier B.V. All rights reserved.