Hot compression deformation characteristics of Al-12Si alloy doped with amorphous Fe powder

doi:10.13251/j.issn.0254-6051.2020.05.015

Abstract

Abstract: To improve the hot deformation resistance of Al-12Si alloy and to explore the effect of amorphous Fe powder doping on the hot compression behavior of Al-12Si alloy and the crystallization temperature of doped amorphous Fe powder in hot compression, the Al-12Si alloy specimens without and with doping of 10wt% amorphous Fe powder were prepared by continuous extrusion. The hot-pressing tests at different temperatures and strain rates were carried out to analyze the microstructure transformation of the specimens in hot-pressing, and the heat flux stress equation of the specimen was constructed by hyperbolic sinusoidal relation. The results show that Fe maintains amorphous when the doped alloy specimens are subjected to hot compression at 450 ℃ and below, while the crystallization is occurred at 500 ℃. The hot deformation resistance of the Al-12Si alloy is improved by doping 10wt% amorphous Fe powder, and its hot compression activation energy Q is 211.29 kJ/mol, which is 40.78 kJ/mol higher than that of the undoped alloy. Dynamic recovery and dynamic recrystallization occur during the hot compression. The heat flow stress equation of the doped alloy is constructed by hyperbolic sinusoidal relationship: ε·=4.42×10¹⁴[sinh(0.016 6σ)]^6.13exp(-211 290/RT), with a linear regression coefficient of 0.99. It can provide some theoretical guidance for the hot working of amorphous Fe powder doped specimens.

Key words: amorphous Fe powder, Al-12Si alloy, hot compression behavior, flow stress

CLC Number:

TG146.2

Yang Hao, Wang Yuan, Wang Xiuchang. Hot compression deformation characteristics of Al-12Si alloy doped with amorphous Fe powder[J]. Heat Treatment of Metals, 2020, 45(5): 78-83.

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