期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.062
关键词
Mechanical characterization; Microanalysis; X-ray diffraction; Aluminum alloys; Casting; Grain refinement
类别
资金
- Nature Science Foundation of Inner Mongolia of China
The effects of erbium (Er) modification on the microstructure and mechanical properties of A356 aluminum alloys were investigated using optical microscope, X-ray diffraction, scanning electronic microscope and mechanical testing. Experimental results show that additions of Er refined the alpha-Al grains and eutectic Si phases in its as-cast state; the addition of 0.3 wt% of Er has the best effects on them. The Fe-containing Al3Er phases were introduced by the modifications; by a T6 treatment, the eutectic Si phases were further sphereodized; the large Al3Er and beta-Al5FeSi phases were changed into fine particles and short rods; which enhanced the hardness of the alloys. The highest strength and elongation were obtained for the 0.3 wt% of Er-modified and T6-treated A356 alloy. (C) 2015 Published by Elsevier B.V.
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