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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 10    No. 1    February 2000

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Dynamical coarsening processes of microstructures in non-dendritic AlSi7Mg alloy remelted in semi-solid state①
MAO Wei-min(毛卫民), CUI Cheng-lin(崔成林), ZHAO Ai-min(赵爱民), SUN Feng(孙 峰), ZHONG Xue-you(钟雪友)

School of Materials Science and Engineering, University of Science and Technology Beijing,
Beijing100083, P.R.China

Abstract:The microstructural variation in the non-dendritic AlSi7Mg samples remelted in the semi-solid state has been investigated. It is proposed that the primaryα-Al phases are mainly coarsened by connecting the secondary arms or fine primaryα-Al phases together at the stage of a small quantity of liquid and slowly coarsened through diffusion at the stage of a great quantity of liquid. The dynamical coarsening equation controlled by diffusion is in good agreement with the
equation ofd3-d30=ktand the effect of the starting microstructures on the coarsening of primaryα-Al phases is gradually decreased when the soaking time is long enough.

 

Key words: aluminium alloy; semi-solid; isothermal remelting; microstructure

ISSN 1672-7029
CN 43-1423/U

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