Acta Metall Sin  1997, Vol. 33 Issue (11): 1140-1146    DOI:

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RESEARCH ON PRIMARY DENDRITIC SPACING IN UNIDIRECTIONAL SOLIDIFICATION OF Al-4.5Cu SINGLE CRYSTAL

LIN Xin;HUANG Weidong;PAN Qingyue;DING Guolu;XUE Yufang;ZHOU Yaohe(Stale Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072)

LIN Xin;HUANG Weidong;PAN Qingyue;DING Guolu;XUE Yufang;ZHOU Yaohe(Stale Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072). RESEARCH ON PRIMARY DENDRITIC SPACING IN UNIDIRECTIONAL SOLIDIFICATION OF Al-4.5Cu SINGLE CRYSTAL. Acta Metall Sin, 1997, 33(11): 1140-1146.

Abstract References Related Articles Recommended Metrics Download:  PDF(3236KB)  Export:  BibTeX | EndNote (RIS)       Abstract  In unidirectional solidification of Al-4.5Cu alloy,history-dependent selection of the primary dendritic spacing is systematically investigated by the experimental method of step-variation in growth rate. A single crystal is formed in the sample before each experimental run, so that the influence of crystal boundary on the primary spacing is avoided. It is found that the primary dendritic spacing is remarkably history-dependent in the metallic alloy as in the transparent model alloy. The average primary spacing is dependent not only on the current growth conditions as described in the previous models, but also on the way those conditions were achieved remarkably. There exists a wide allowable range of primary spacing for given growth conditions. The lower limit obtained experimentally is compared with that calculated theoretically with the Hunt-Lu model, which shows excellent fit between them. Key words:  primary dendritic spacing      unidirectional solidification      Al-4.5Cu single crystal      history-dependence      Received:  18 November 1997      Service E-mail this article Add to citation manager E-mail Alert RSS Collect articles（） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I11/1140 1WarrenJA,LangerJS.PhysRev,1990;A42:3518 2WarrenJA,LangerJS.PhysRev,1993;E47:2702 3LuShuzu,HuntJD.JCrystGrowth,1992;123:17 4HuntJD,LuShuzu.MetallMaterTrans,1996;A27:611 5黄卫东,商宝禄,周尧和.航空学报,1992;13:A377 6HuangWeidong,GengXingguo,ZhouYaohe.JCrystGrowth,1993;134:105 7丁国陆,林鑫,黄卫东,周尧和.金属学报,1995;31:A469 8DingGL,HuangWD,HuangX,LinX,ZhouYH.ActaMater,1996;44:3705 9HanSH,TrivediR.ActaMetallMater,1994;42:25 10PrattRA,GrugelRN.MaterCharact,1993;31:225 11QuestedPN,McLeanM.MaterSciEng,1984;65:171 12ChopraMA,TewariSN.MetallTrans,1991;A22:2467 13林鑫.西北工业大学硕士学位论文,1996 14HuntJD.SolidificationandCastingofMetals.London:MetalsSociety,1979:3 15YoungKP,KirkwoodK.MetallTrans,1975;A6:197 16林鑫,黄卫东,丁国陆,王琦,周尧和.金属学报,1997;33:449R [1] YANG Qianqian, LIU Yuan, LI Yanxiang. 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