Effect of Modification on Microstructure and Properties of AZ91 Magnesium Alloy

Crystals

Adam Gryc¹  Andrzej Kiełbus¹  Robert Jarosz² 

[1] Department of Advanced Materials and Technologies, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland;ZM “WSK Rzeszów” Sp. z o.o., 35-001 Rzeszów, Poland;

关键词: grain refinement;    AZ91;    overheating;    hexachloroethane;    wax-CaF₂-carbon;    microstructure;   

DOI  :  10.3390/cryst10060536

来源: DOAJ

【 摘 要 】

Refinement of α-Mg solid solution grains has a significant influence on the improvement of mechanical properties of cast magnesium alloys. In the article, the effects of three modifiers on microstructure and properties of AZ91 magnesium alloy casted to a sand mould were described. Overheating, hexachloroethane and wax-CaF₂-carbon powder were applied. The research procedure comprised microstructure analysis by means of light microscopy, scanning electron microscopy and quantitative analysis with AnalySIS Pro^® software and mechanical properties’ investigation. The microstructure of AZ91 alloy in the as-cast condition consists of α-Mg solid solution with precipitates of Mg₁₇Al_12, Mg₂Si and Al₈Mn₅ phases. It was reported that all applied modifiers cause refinement of α-Mg solid solution grains and a decrease of the volume fraction of α-Mg+Mg₁₇Al₁₂ compound discontinuous precipitates. The best results were obtained in the case of wax-CaF₂-carbon powder.

【 授权许可】

Unknown