Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 5, Pages 1573-1578Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.10.152
Keywords
In situ TiB2 particle; Rare earth CeO2; Dispersion; Mechanical properties
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Funding
- National 863 item of China [2008AA03A239]
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In this paper, CeO2 was investigated as an additive for in situ preparation of TiB2/Al composite using an exothermic reaction process via K2TiF6 and KBF4 salts. Experimental results indicated that when 0.5 wt.% CeO2 additive was added, the dispersion of TiB2 particles was improved significantly. Meanwhile, alpha-Al matrix grain was further refined. Compared with the composite without CeO2, the ultimate tensile strength, yield strength, elastic modulus and tensile elongation increased by 8%, 7%, 26% and 14%, respectively in as-cast condition, and the tensile fracture behavior of the composite with CeO2 belonged to a typical ductile fracture with microvoid coalescence. (C) 2010 Elsevier B.V. All rights reserved.
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