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The evolution of microstructure and mechanical properties during high-speed direct-chill casting in different al–mg_2si in situ composites

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International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 1080-1089页

作者： Dong-tao Wang Hai-tao Zhang Lei Li Hai-lin Wu Ke Qin Jian-zhong Cui Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University

The effect of high-speed direct-chill(DC) casting on the microstructure and mechanical properties of al–mg_2si in situ composites and AA6061 alloy was investigated. The microstructural evolution of the al–mg_2si composites and AA6061 alloy was examined by optical microscopy, field-emission scanning electron microscopy(FE-SEM) and transmission electron microscopy(TEM). The results revealed that an increase of the casting speed substantially refined the primary mg_2si particles(from 28 to 12 μm), the spacing of eutectic mg_2si(from 3 to 0.5 μm), and the grains of AA6061 alloy(from 102 to 22 μm). The morphology of the eutectic mg_2si transformed from lamellar to rod-like and fibrous with increasing casting speed. The tensile tests showed that the yield strength, tensile strength, and elongation improved at higher casting speeds because of refinement of the mg_2si phase and the grains in the al–mg_2si composites and the AA6061 alloy. High-speed DC casting is demonstrated to be an effective method to improve the mechanical properties of al–mg_2si composites and AA6061 alloy billets.

关键词： al–mg2si in situ composite casting speed grain size primary mg2si mechanical property

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Effect of Primary and Eutectic mg_2si Crystal Modifications on the Mechanical Properties and Sliding Wear Behaviour of an al–20mg_2si–2Cu–xBi Composite

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Journal of Materials Science & Technology 2016年第11期32卷 1083-1097页

作者： Saeed Farahany Hamidreza Ghandvar Nur Azmah Nordin ali Ourdjini Mohd Hasbullah Idris Department of Materials and Mechanical Engineering Buein Zahra Technical University Department of Materials Manufacturing and Industrial Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia (UTM) Department of Mechanical Engineering Faculty of Engineering University of Ottawa

This work investigated the microstructure evolution, tensile, impact, hardness, and sliding wear properties of an al–20mg2si–2Cu in situ composite treated with different Bi contents. The desired modification of primary mg2 si particles was achieved with the addition of 0.4 wt% Bi. Increasing Bi beyond 0.4 wt%resulted in a loss of modification, possibly due to the formation of al8 mgB iS i4 compound before the precipitation of the primary mg2 si. Additionally, the structure of the pseudo-eutectic mg2 si was transformed from plate to fibrous, which was consistent with decrease of growth temperature extracted from the cooling curve thermal analysis. Addition of Bi had an effect on the morphology of al5 Fe si（β）, al2Cu（θ） and al5Cu2mg8si6（Q） intermetallic compounds. The tensile strength, elongation percentage, impact toughness, and hardness increased by 6%, 13%, 75%, and 23%, respectively, due to modification of both the primary and eutectic mg2 si crystals. The tensile and impact fracture surfaces showed fewer decohered particles in the Bi-treated composite. The enhancement in wear resistance of the Bi-treated composite could be attributed to solid lubricant function of insoluble soft Bi phase and modification effects on mg2 si particles.

关键词： al–mg2si Composite Modification Bismuth Mechanical properties Wear

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