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Origin of the anomalous volume expansion in Al–Si alloys above liquidus

Published online by Cambridge University Press:  31 January 2011

W. M. Wang ,
X. F. Bian ,
H. R. Wang ,
Zhen Wang ,
L. Zhang ,
Z. G. Liu  and
J-M. Liu
W. M. Wang*
Affiliation:
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China; and Key Laboratory of Liquid Structure and Heredity of Materials, Shandong University, Jinan 250061, People's Republic of China
X. F. Bian
Affiliation:
Key Laboratory of Liquid Structure and Heredity of Materials, Shandong University, Jinan 250061, People's Republic of China
H. R. Wang
Affiliation:
Key Laboratory of Liquid Structure and Heredity of Materials, Shandong University, Jinan 250061, People's Republic of China
Zhen Wang
Affiliation:
Key Laboratory of Liquid Structure and Heredity of Materials, Shandong University, Jinan 250061, People's Republic of China
L. Zhang
Affiliation:
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
Z. G. Liu
Affiliation:
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
J-M. Liu
Affiliation:
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
*
a)Address all correspondence to this author. e-mail: wmwang@nju.edu.cn
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Abstract

The sessile-drop method and high-temperature small-angle x-ray diffraction technique were used to characterize the density of liquid Al–Si alloys with Si content C = 0 to 22 wt%. A distinct abnormal volume expansion of the hyper-eutectic melts was identified just above the liquidus (within TL–Tk) during the heating sequence (h.s.), which is irreversible during the cooling sequence (c.s.). This phenomenon is explained by the segregation of Si atoms from the supersaturated “quasi-eutectic” structure and formation of silicon clusters in the superheated melt. In addition, a pre-peak in the x-ray diffraction spectrum of Al–14% Si melt was observed at 850 °C, which is associated with the silicon clusters. The pre-peak remains when the superheated melt is cooled down to the liquidus (670 °C); this result is in accord with the density measurements.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3592 - 3598
Copyright
Copyright © Materials Research Society 2001

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References

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