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Title: In situ CrB{sub 2} and its effect on the mechanical properties of A390 alloy

In this work, a series of CrB{sub 2}/A390 composite alloys have been prepared and analyzed by a field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). Firstly, in situ CrB{sub 2} has been prepared by reducing reaction that occurred in Al melt: AlB{sub 2} + [Cr] → Al + CrB{sub 2}. The CrB{sub 2} particles exhibit regular hexagonal platelet morphology and distribute uniformly in the Al matrix. Then, A390 alloys with different CrB{sub 2} additions have been prepared. With the addition of CrB{sub 2}, the size of primary Si can be reduced remarkably. The generation of CrB{sub 2} particles and their diffuse distribution can improve the mechanical properties of A390 alloy obviously. The mechanical properties of the base alloy, including ultimate tensile strength at 25 °C (UTS{sub 25°C}), the coefficient of thermal expansion (CTE) and wear resistance have been studied and the composite alloy with 3 wt.% CrB{sub 2} particle addition showed the best performance. - Highlights: • CrB2/A390 composite alloy was successfully fabricated at 850 °C. • The reaction between AlB2 and Cr was investigated. • The possible coherent interface of CrB2 and Si was calculated. • Mechanical properties of A390 alloy are improved with the addition ofmore » CrB2.« less
Authors:
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Publication Date:
OSTI Identifier:
22288714
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 86; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; ALUMINIUM BORIDES; CHROMIUM BORIDES; FIELD EMISSION; MICROSTRUCTURE; PARTICLES; SCANNING ELECTRON MICROSCOPY; TENSILE PROPERTIES; THERMAL EXPANSION; WEAR RESISTANCE; X-RAY DIFFRACTION