Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 502, Issue 1-2, Pages 2-5Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.12.005
Keywords
AZ91 alloy; Ultrasonic power; Grain size; Mechanical properties
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Funding
- National Natural Science Foundation of China [50374046]
- Excellent Young Teachers Foundation of Shanghai [07-703]
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Ultrasonic vibration with different powers from 0W to 700W was applied during the solidification process of AZ91 alloy. The microstructures and mechanical properties of the treated AZ91 alloy were characterized. Without subject to ultrasonic vibration (0W of ultrasonic power), the dendrites were coarse and large. Globular grains were obtained in AZ91 alloy subject to high intensity ultrasonic vibration. The grain size was decreased gradually from 202 mu m to 146 mu m with increasing ultrasonic power. The mechanical properties of the treated alloy were also improved. The ultimate tensile strength was increased from 145 MPa to 195 MPa and elongation to fracture from 2.3% to 5.2% correspondingly with increasing ultrasonic power. The mechanism by which ultrasonic power affects the microstructure and mechanical properties of AZ91 alloy is discussed. (C) 2009 Published by Elsevier B.V.
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