학술논문
Al/Al2O3metal matrix composites produced using magnetic field-assisted freeze-casting of porous ceramic structures
Document Type
Article
Author
Source
Journal of Materials Research; May 2021, Vol. 36 Issue: 10 p2094-2106, 13p
Subject
Language
ISSN
08842914; 20445326
Abstract
Abstract: Al/Al2 O3 metal matrix composites (MMCs) were produced by metal infiltration of porous ceramic preforms. The porous ceramic preforms were fabricated using the magnetic field-assisted freeze-casting method, resulting in vertically aligned porous channels. Preforms were prepared by freezing an Al2 O3 /Fe3 O4 -containing slurry within an applied magnetic field. Vertical alignment of the channels was facilitated by the magnetic response of the Fe3 O4 in the slurry during the freezing process. After freezing and sublimation, the ceramic preforms were sintered and then infiltrated with molten A356 Al-based alloy. The mechanical properties of the resulting Al2 O3 /A356 MMCs were compared to those of bulk Al2 O3 , bulk Al-based alloy (A356), and porous Al2 O3 preforms using micro-indentation testing. The indentation hardness and elastic moduli values of Al2 O3 /A356 MMCs showed good agreement with the predicted theoretical calculations. This study provides a new approach for the design of MMCs with controlled composition and improved mechanical characteristics. Graphic abstract: