| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Crystal Growth in Al72.9Ge27.1 Alloy Melt under Acoustic Levitation Conditions |
| YAN Na, DAI Fu-Ping, WANG Wei-Li, WEI Bing-Bo**
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| Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072 |
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| Cite this article: |
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YAN Na, DAI Fu-Ping, WANG Wei-Li et al 2011 Chin. Phys. Lett. 28 078101 |
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Abstract The nonequilibrium solidification of liquid Al72.9Ge27.1 hypoeutectic alloy is accomplished by using single−axis acoustic levitation. A maximum undercooling of 112 K (0.16TL) is obtained for the alloy melt at a cooling rate of 50 K/s. The primary (Al) phase displays a morphological transition from coarse dendrite under a normal conditions to equiaxed grain under acoustic levitation. In the (Al)+(Ge) eutectic, the (Ge) phase exhibits a conspicuous branched growth morphology. Both the primary (Al) dendrites and (Al)+(Ge) eutectics are well refined and the solute content of the primary (Al) phase is extended under acoustic levitation. The calculated and experimental results indicate that the solute trapping effect becomes more intensive with the enhancement of bulk undercooling.
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| Keywords:
81.30.Fb
43.25.Uv
81.05.Bx
81.10.Fq
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Received: 10 March 2011
Published: 29 June 2011
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| PACS: |
81.30.Fb
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(Solidification)
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43.25.Uv
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(Acoustic levitation)
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81.05.Bx
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(Metals, semimetals, and alloys)
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81.10.Fq
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(Growth from melts; zone melting and refining)
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