Journal
MATERIALS & DESIGN
Volume 57, Issue -, Pages 638-645Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2014.01.022
Keywords
Magnesium matrix composite; Ultrasonic; Stir casting; Particle distribution; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51101043, 50801017, 51001036]
- Key Project of Science and Technology Department of Heilongjiang Province of China [GC12A109]
- China Post-doctoral Science Foundation [2013M531035]
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The novel stir casting assisted by ultrasonic treatment processing was studied. Unlike traditional stir casting, short semi-solid stir time was needed for addition and pre-dispersion of the particles in the novel processing. For ultrasonic treatment, there existed an optimal time. Both too short and too long time for the treatment resulted in nonhomogeneous particle distribution. Furthermore, the liquid stirring after ultrasonic treatment was proved to be necessary to further improve particle distribution. The mechanical properties of the composites fabricated by different parameters indicated that ultrasonic treatment evidently improved the mechanical properties compared with traditional stir casting. 5-20% SiCp/AZ91 composites were fabricated by the novel processing. The particle distribution was uniform in these composites. The grains were refined by addition of SiC particles. Grain sizes of composites decreased with the increases of particle contents. The ultimate tensile strength, yield strength and elastic modulus were enhanced as the particle contents increased. (C) 2014 Elsevier Ltd. All rights reserved.
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