| INTERFACE MORPHOLOGIES AND MICROSTRUCTURES DURING DENDRITE-TO-CELL TRANSITION AT HIGH GROWTH RATE |
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| 作者姓名： | LI Jianguo MAO Xiemin FU Hengzhi National Laboratory of solidification Technology Northwestern Polytechnical University Xi'an China Lecturer.Faculty No. Northwestern Polytechnical University Xi'an China |
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| 作者单位： | LI Jianguo MAO Xiemin FU Hengzhi National Laboratory of solidification Technology，Northwestern Polytechnical University，Xi'an，China Lecturer.Faculty No.403，Northwestern Polytechnical University，Xi'an 710072，China |
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| 摘 要： | The interface morphologies and microstruetures of the directionally solidified Ni-5wt-% Cualloy during dendrite-to-cell transition at high growth rates have been investigated with anewly developed apparatus for unidirectional solidification with the temperature gradient atthe solid/liquid interface higher than 1000 K/cm.The results show that in the vicinity ofdendrite-to-cell transition point,the well developed sidebranches become shrivelled with theincrease of growth rate and disappear at the dendrite-to-cell transition,and the primaryspacing decreases simultaneously.Moreover,the length of mushy zone decreases greatly dur-ing the dendrite-to-cell transition.Cells obtained at high growth rates have very similarmorphologies to those at low growth rates,but with much smaller cell spacings andunsmoothed cell walls which may be attributed to the different stability conditions of the cellwalls at low and high growth rates respectively.
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| 收稿时间： | 1991-02-25 |
| 修稿时间： | 1991-02-25 |
INTERFACE MORPHOLOGIES AND MICROSTRUCTURES DURING DENDRITE-TO-CELL TRANSITION AT HIGH GROWTH RATE |
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| LI Jianguo MAO Xiemin FU Hengzhi National Laboratory of solidification Technology,Northwestern Polytechnical University,Xi''''an,China Lecturer.Faculty No.,Northwestern Polytechnical University,Xi''''an ,China.INTERFACE MORPHOLOGIES AND MICROSTRUCTURES DURING DENDRITE-TO-CELL TRANSITION AT HIGH GROWTH RATE[J].Acta Metallurgica Sinica(English Letters),1991,4(1):71-74. |
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| Authors: | LI Jianguo MAO Xiemin FU Hengzhi National Laboratory of solidification Technology Northwestern Polytechnical University Xi'an China LecturerFaculty No Northwestern Polytechnical University Xi'an China |
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| Abstract: | The interface morphologies and microstruetures of the directionally solidified Ni-5wt-% Cu alloy during dendrite-to-cell transition at high growth rates have been investigated with a newly developed apparatus for unidirectional solidification with the temperature gradient at the solid/liquid interface higher than 1000 K/cm.The results show that in the vicinity of dendrite-to-cell transition point,the well developed sidebranches become shrivelled with the increase of growth rate and disappear at the dendrite-to-cell transition,and the primary spacing decreases simultaneously.Moreover,the length of mushy zone decreases greatly dur- ing the dendrite-to-cell transition.Cells obtained at high growth rates have very similar morphologies to those at low growth rates,but with much smaller cell spacings and unsmoothed cell walls which may be attributed to the different stability conditions of the cell walls at low and high growth rates respectively. |
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| Keywords: | cellular growth interface morphology primary spacing rapid solidification dendrite-to-cell transition |
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