Y. F. Wang, H. Zhou, J. H. Wang, Y. Liu, H. Tu, X. P. Su
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Abstract
In this study, an experimental device was designed to conduct melt quenching of Al–18Si alloy. The effect of annealing treatment on microstructure and mechanical properties of Al–18Si alloy cast by melt quenching was studied. The results showed that the microstructure of Al–18Si alloy cast by melt quenching was transformed into a pseudo-eutectic microstructure. With the increasing annealing temperature, the dissolution and diffusion rates of the eutectic silicon phase increased, and with the extension of holding time, eutectic silicon tended to spherulite. The best spherulite microstructure was obtained by annealing the alloy at 580°C or 40 min, and the silicon phase surface shape factor (φ) in the microstructure was 0.8. After annealing at 580°C for 40 min, the maximum impact toughness (σb) and elongation (δ) of Al–18Si alloy cast by melt quenching was 99.0 J/cm2 and 13.6%, respectively. Compared with the unannealed Al–18Si alloy cast by melt quenching, the impact toughness and elongation of the annealed alloy increased by 239.0 and 112.5%, respectively.
期刊介绍：
The Physics of Metals and Metallography (Fizika metallov i metallovedenie) was founded in 1955 by the USSR Academy of Sciences. Its scientific profile involves the theory of metals and metal alloys, their electrical and magnetic properties, as well as their structure, phase transformations, and principal mechanical properties. The journal also publishes scientific reviews and papers written by experts involved in fundamental, application, and technological studies. The annual volume of publications amounts to some 250 papers submitted from 100 leading national scientific institutions.
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