The Influence of Aluminum on the Microstructure and Hardness of Mg-5Si-7Sn Alloy

• Autorzy: Rzychoń T. , Dybowski B.

Identyfikatory

DOI

10.1515/amm-2016-0077,

• Języki publikacji: EN

Abstrakty

EN

Magnesium alloys due the low density and good mechanical properties are mainly used in the automotive and aerospace industry. In recent years, magnesium alloys are extensively developed for use in high temperatures (above 120°C). Among these alloys, magnesium alloys containing tin and silicon have large possibilities of application due to the formation of thermally stable intermetallic Mg₂Sn and Mg₂Si. In this paper the influence of aluminum and heat treatment on the on the microstructure and hardness of Mg-7Sn-5Si alloy is reported. It was found that the microstructure of Mg-7Sn-5Si alloy consist of α-Mg solid solution, Mg₂Sn and Mg₂Si compounds. Addition of 2 wt% of Al to Mg-7Sn-5Si alloy causes the formation of Al₂Sn phase. Moreover, Al dissolves in the α-Mg solid solution. The solution heat-treatment of tested alloys at 500°C for 24 h causes the dissolve the Mg₂Sn phase in the α-Mg matrix and spheroidization of Mg₂Si compound. The Mg₂Si primary crystals are stable at solution temperature. After ageing treatment the precipitation process of equilibrium Mg₂Sn phase was found in both alloys. The addition of aluminum has a positive effect on the hardness of Mg-7Sn-5Si alloy. In case of Mg-5Si-7Sn-2Al alloy the highest hardness was obtained for sample aged for 148 h at 250°C (88 HV2), while in case of Al-free alloy the highest hardness is 70 HV for material aged for 148 h at 250°C.

Słowa kluczowe

EN

cast magnesium alloys; Mg-Si alloys; Mg-Sn alloys; microstructure; precipitation hardening

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2016
• Tom: Vol. 61, iss. 1
• Strony: 425--432
• Opis fizyczny: Bibliogr. 24 poz., rys., tab., wykr.

Twórcy

autor

Rzychoń T.

• Silesian University of Technology, Faculty of Material Science and Metallurgy, 40-019 Katowice, 8 Krasińskiego Str., Poland

autor

Dybowski B.

• Silesian University of Technology, Faculty of Material Science and Metallurgy, 40-019 Katowice, 8 Krasińskiego Str., Poland

Bibliografia

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Uwagi

EN

The present work was supported by the National Science Centre under the project UMO-2011/03/D/ST8/03869. The author is grateful to P. Skupien (IMZ Gliwice) for their assistance.

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę