Acta Metall Sin  1996, Vol. 32 Issue (2): 113-119    DOI:

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PREPARATION OF HOMOGENEITY IMMISCIBLE ALLOY BY MARANGONI CONVECTION

XIAN Aiping; ZHANG Ｘiumu; LI Zhongyu; LIU Qingquan; CHEN Jizhi;LI Yiyi(International Center for Materials Physics; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-06-06; in revised form 1995-11-07)

XIAN Aiping; ZHANG Ｘiumu; LI Zhongyu; LIU Qingquan; CHEN Jizhi;LI Yiyi(International Center for Materials Physics; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-06-06; in revised form 1995-11-07). PREPARATION OF HOMOGENEITY IMMISCIBLE ALLOY BY MARANGONI CONVECTION. Acta Metall Sin, 1996, 32(2): 113-119.

Abstract References Related Articles Recommended Metrics Download:  PDF(544KB)  Export:  BibTeX | EndNote (RIS)       Abstract  A new control casting technique was designed for making homogeneity immiscible alloy in earth gravity field by Marangoni migration of the secondary phase drops in the melting alloy under a temperature gradient. In the technique, the droplet of the secondary phase ahead the solid-liquid interface of the melt of the immiscible alloy will make Stokes movement in gravity field and Marangoni movement in the opposite direction of gravity field in temperature gradient field. As a result, the net velocity of the droplets in the melt will be dependent on the size of the droplets. When the size of the droplets is very small,Marangoni movement of the droplets will dominate, otherwise Stokes movement will dominate. When the net velocity is zero, there will be a critical size of the droplet. By controlling the stability of the solidification process, an ingot with uniform distribution of the dropletscan be obtained. The critical size of the secondary phase droplets was estimated by the following equation Solidification test on Al-Bi and Al-Pb alloy showed that the size of the Bi or Pb particles in Al matrix is roughly the same order of magnitude as that obtained by above equation.Finally, a new conception, precipitation incubation period, was suggested in the discussion.(Correspondent. XIAN Aiping. professor, Institute of Metal Research, Chinese Academy of Scienoes, Shenyang110015) Key words:  immiscible alloy      casting      solidification      segregation      fluid physics      Received:  18 February 1996      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1996/V32/I2/113 1PredelB,RatkeL,FredrikssonH．FluidScienceandMaterialsScienceinSpace,In:WalterHUed,Berlin: Springer,1978:5172RegerJL．MaterialsProcessinginspace．Washington: EarlyExperimentsNASA,19803GellesSH,MarkworthJ．MicrogravityStudiesintheliquidphaseImmiscibleSystemAl-In,15thAJAAConf,losAngeles,1977:774WalterHU．WorkshoponEffectofGravityonSolidificationofImmisciblealloys,Stockholm,ESASP-219,1984;475WalterHU．MicrogravityNewsfromEsa,1994;7:26ZhangXM,XianAP,LiZY,LiuQQ,ChenJZ,LiYY,SecondJapan-ChinaWorkshoponMicrogravityscience,TokyoInstituteofTechnology,1994:177冼爱平,张修睦等.中国专利申请No.94112581．58YoungON,GoldsteinSJ,BlockJM．JFluidMech,1959;6:3509SmithellsCJ,MetalReferenceBook．5thEd,LondonandBoston:BufferWorthsCoLtd,197610McalisterAJ．PhaseDiagramsofBinaryAlloy,ASMUSA,1986:96,14711CamelD,EustathopoulosN,DesreP．ActaMetall,1980;28:23912HultgrenR,DesaiPD,HawkinsDT,GleiserM,KelleyKK．SelectedValuesofThermodynamicpropertiesofBinaryAlloys,MetalsPark,Ohio:AmSocMetals,1973 [1] MA Dexin, ZHAO Yunxing, XU Weitai, WANG Fu. 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