Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (1): 123-128.doi: 10.6040/j.issn.1672-3961.0.2019.002

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Liquid-liquid phase separation and solidification behavior of Al65Bi28Cu7 monotectic alloy

Na ZHANG1(),Yanjun YU1,Yuqing WANG1,Degang ZHAO2   

  1. 1. Shandong Polytechnic, Jinan 250104, Shandong, China
    2. School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong, China
  • Received:2019-01-03 Online:2020-02-20 Published:2020-02-14
  • Supported by:
    山东职业学院科研基金资助项目(KY-XY-201717)

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Abstract:

The liquid-liquid phase separation of Al65Bi28Cu7 monotectic alloy melt cast in copper mould was investigated by resistivity method. The formation mechanism of core-shell structure of Al65Bi28Cu7 monotectic alloy was discussed. The results showed that the anomalous changes in ρ-T curve confirmed the occurrence of liquid phase separation, monotectic reaction and eutectic reaction in the solidification of Al65Bi28Cu7 monotectic alloy melt. The anomalous change above monotectic temperature in ρ-T curve should be attributed to the concentration fluctuation of melt. The core-shell structure of Al-rich core covered by Bi-rich could form in the Al65Bi28Cu7 monotectic alloy.

Key words: monotectic alloy, liquid phase separation, resistivity method, solidification

CLC Number: 

  • TG146.2

Fig.1

The ρ-T curve of Al65Bi28Cu7 immiscible alloy at a heating rate of 10 ℃/minThe ρ-T curve of Al65Bi28Cu7 immiscible alloy at a heating rate of 10 ℃/min"

Fig.2

The XRD pattern of Al65Bi28Cu7 immiscible alloy"

Fig.3

The SEM results of Al65Bi28Cu7 immiscible alloy cast in copper mould"

Fig.4

The EDS results of point 1 in Fig. 3"

Fig.5

The EDS results of point 2 in Fig. 3"

Fig.6

The EDS results of point 3 in Fig. 3"

Fig.7

SEM of Al65Bi28Cu7 immiscible alloy cast in copper mould"

Fig.8

Enlarged SEM image of rectangle region in Fig. 7"

Fig.9

Enlarged SEM image of Fig. 8"

Fig.10

Enlarged SEM image of circle region in Fig. 7"

Fig.11

The solidification schematic of Al65Bi28Cu7immiscible alloy in copper mould"

Fig.12

SEM of Al65Bi28Cu7 immiscible alloy cast in sand mould"

Fig.13

Enlarged SEM image of rectangle region in Fig. 12"

Fig.14

Enlarged SEM image of rectangle region in Fig. 13"

Fig.15

Enlarged SEM image of circle region in Fig. 13"

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