Microstructure Characteristics and Apparent Viscosity of Hypereutectic Al-24%Si Alloy Melt During Semi-solid State Stirring

Yanjun Li; Weimin Mao; Zisheng Zhen; Xueyou Zhong

Volume 8 Issue 2

Jun. 2001

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Abstract

International Journal of Minerals, Metallurgy and Materials > 2001 > 8(2): 126-128.

Yanjun Li, Weimin Mao, Zisheng Zhen, and Xueyou Zhong, Microstructure Characteristics and Apparent Viscosity of Hypereutectic Al-24%Si Alloy Melt During Semi-solid State Stirring, J. Univ. Sci. Technol. Beijing , 8(2001), No. 2, pp.126-128.

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Materials

Microstructure Characteristics and Apparent Viscosity of Hypereutectic Al-24%Si Alloy Melt During Semi-solid State Stirring

Author Affilications

Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China

Funds:

supported by National Natural Science Foundation of China(Item No. 59771011)

Received: 01 September 2000; Available Online: 16 June 2021

Graphical Abstract

Abstract

Abstract

The microstructural evolution and apparent viscosity of hypereutectic Al-24%Si alloy during semi-solid state shearing were studied with a Searte type viscometer. When the alloy melt was continuously stirred from 720 ℃ to eutectic temperature, the primary Si crystals were gradually changed from elongated platelets to near-spherical shapes. It was found that some nondendritic α-phase formed when the melt was stirred below 585 ℃. The experiment showed that the semi-solid stirring had strong effect on inhibiting the anisotropic growth of Si crystals during solidification. The apparent viscosity of the alloy melt increased slowly with the decreasing of temperature before the formation of nondendritic α-phase, which caused the dramatic increase of apparent viscosity.
- hypereutectic Al-Si alloy,
- solidification structures,
- apparent viscosity

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