Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 24, Issue 8, Pages 2489-2496Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63375-6
Keywords
Al-Cu alloy; grain refinement; solidification; mechanical vibration
Categories
Funding
- National Natural Science Foundation of China [50804023]
- Education Department of Jiangxi Province, China [GJJ12032]
- Natural Science Foundation of Jiangxi Province, China [20122BAB206021]
- Jiangxi Province Young Scientists Cultivating Programs, China [20122BCB23001]
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A mechanical vibration technique to refine solidified microstructure was reported. Vibration energy was directly introduced into a molten alloy by a vibrating horn, and the vibrating horn was melted during vibration. Effects of vibration acceleration and mass ratio on the microstructure of Al-5% Cu alloy were investigated. Results show that the present mechanical vibration could provide localized cooling by extracting heat from the interior of molten alloy, and the cooling rate is strongly dependent on vibration acceleration. It is difficult to refine the solidified microstructure when the treated alloy keeps full liquid state within the entire vibrating duration. Significantly refined microstructure was obtained by applying mechanical vibration during the initial stage of solidification. Moreover, mechanisms of grain refinement were discussed.
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