Kinetics of Precipitation and Coarsening of Si-containing Phases in a Supersaturated Al-20% Si Alloy

doi:10.11901/1005.3093.2018.139

Chinese Journal of Materials Research

2018, Vol. 32

Issue (10): 743-750 DOI: 10.11901/1005.3093.2018.139

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Kinetics of Precipitation and Coarsening of Si-containing Phases in a Supersaturated Al-20% Si Alloy

Zhongpeng HU¹, Jun JIANG¹, Fujin LIAO², Liandeng WANG², Dingyi ZHU¹(

)

1 School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
2 School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China

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Zhongpeng HU, Jun JIANG, Fujin LIAO, Liandeng WANG, Dingyi ZHU. Kinetics of Precipitation and Coarsening of Si-containing Phases in a Supersaturated Al-20% Si Alloy. Chinese Journal of Materials Research, 2018, 32(10): 743-750.

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Abstract

The kinetics of precipitation and coarsening of Si-containing phases and the microstructure evolution of the die-casting plate of supersaturated Al-20%Si alloy during thermal treatment at 450 to 550℃ were investigated by means of differential scanning calorimeter (DSC), scanning electron microscope (SEM), and X-ray diffractometer (XRD). Results show that due to the pressure die casting induced rapid solidification and modification, the Al-20%Si alloy presented a non-equilibrium solidified and distorted microstructure with fine Si-phases (the average size of Si phase grains was less than 1 μm). In the annealing process the lattice distortion of the α-Al matrix was alleviated to some extent and the diffusion mechanism related with the coarsening of Si-phases seemed to be the bulk diffusion control (the coarsening index is approximately 3) with the activation energy of 69.59 kJ/mol. The annealing temperature exerted a significant effect on the coarsening rate constant but not on the coarsening index. In the initial stage of annealing, the tensile strength of the alloy decreased while the elongation increased with the increasing holding time. As the holding time longer than 90 minutes, the tensile strength and elongation both stabilized.

Key words: metallic materials kinetics annealing Al-20%Si alloy supersaturated

Received: 31 January 2018

ZTFLH:

TG146

Fund: Supported by Major International Joint Research Program of China (No. 2015DFA71350)

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	Zhongpeng HU
	Jun JIANG
	Fujin LIAO
	Liandeng WANG
	Dingyi ZHU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.139 OR https://www.cjmr.org/EN/Y2018/V32/I10/743

Fig.1 Microstructures of die-casting plate made of Al-20%Si

Fig.2 DSC heating curve of Al-20%Si alloy

Fig.3 Microstructures of Al-20%Si alloy after being separately held for 30 min at different annealing temperatures (a) 25℃; (b) 450℃; (c) 500℃; (d) 550℃

Fig.4 Microstructures of Al-20%Si alloy after the alloy was held for different times at 500℃ (a) 20 min; (b) 60 min; (c) 90 min; (d) 120 min

Fig.5 XRD spectra of the α-Al phase in an elevation-angle zone after being held for 30 min at different annealing temperatures (a) 25℃; (b) 450℃; (c) 500℃; (d) 550℃

Table 1 Lattice parameter of α-Al matrix under different annealing temperature

Fig.6 The logarithmic relationship between the average size

r ?

of Si phases and holding time at different annealing temperatures

Fig.7 Relationship between average size

r ? 3

of Si phase and holding time at different annealing temperatures

Fig.8 Relationship between coarsening rate constant and the annealing temperature

Fig.9 Relationship between tensile strength, and elongation, and the holding time

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