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Vol.36, No.7, 1080 ~ 1085, 1998
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| Title |
| Effect of the Enhanced Gravity on the Microstructure of Unidirectionally Solidified MnBi/Bi Eutectic Alloy under Inverted Temperature Gradient |
| 양영기 Young Ki Yang , 황창모 Chang Mo Hwang , 강춘식 Choon Sik Kang , 이경환 Kyong Whoan Lee |
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| Abstract |
| MnBi Bi eutectic alloy was directionally solidified under enhanced gravity conditions, for a destabilizing thermal gradient, Growth rates were either 1.0cm/h or 1.2cm/h. The thermal gradient applied externally was fixed with 20K/cm under rotational conditions. The experiment shows that the formation of striations can be avoided at certain conditions of net accelerations. This result was discussed in view of the change of critical Rayleigh number, Rac2. To do this, we measured temperature fluctuations in the Bi-melt under similar conditions to growth experiments. |
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| Key Words |
| MnBi/Bi eutectic, Directional solidification, Critical Rayleigh number, Striation, Centrifuge, Enhanced gravity |
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