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Indexed by:Journal Papers

Date of Publication:2015-11-15

Journal:MATERIALS & DESIGN

Included Journals:SCIE、EI、Scopus

Volume:85

Page Number:724-732

ISSN No.:0264-1275

Key Words:In-situ composites; Grain refinement; Eutectic modification; Mechanical properties; Bimodal effect

Abstract:In this work, in-situ A356-2.5 wt.% TiB2 composites were fabricated via a re-melting and diluting (RD) approach. The effects of lanthanum (La) on the microstructures and mechanical properties of the composites were investigated.The results demonstrated that the addition of La can, simultaneously, refine the second dendrite arm spacing (SDAS) of the alpha-Al grains and modify the coarse lamellar eutectic Si into fine fibrous particles. The optimum addition levels for refinement and modification lay at 0.1 wt.% and 0.8 wt.%, respectively, due to the distinct mechanisms between the two Since the resultant mechanical properties are a combined function of refinement and modification, the tensile properties of the composites show a bimodal distribution with the first peak value at 0.1 wt.% and the latter one at 0.8 wt.% La, in accordance with the optimum refinement and modification, respectively. (C) 2015 Elsevier Ltd. All rights reserved