Investigation of Structures in As-Cast Alloys from the Mg-Zn-Ca System

Archives of Metallurgy and Materials

A. Góral¹  L. Litynska-Dobrzynska¹  J. Wojewoda-Budka¹  A. Debski¹  K. Kubok¹ 

[1] Institute of Metallurgy and Materials Science Polish Academy of Sciences, Reymonta 25, 30-059 Kraków, Poland

关键词: Keywords : magnesium alloy;    Mg-Zn-Ca;    Ca2Mg6Zn3;    microstructure;    TEM;   

DOI  :  10.2478/v10172-012-0193-2

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Alloys of nominal composition Mg-3Zn-xCa (x = 0, 0.2, 0.5, 0.7, 1.0, 1.3) wt.% have been prepared by resistance melting and casting into graphite mould under argon atmosphere. All investigated alloys have revealed α(Mg) dendritic microstructures with intermetallic phases distributed in interdendritic spacing. The Mg4Zn7 has been identified as the main phase which coexists with α(Mg) in the Mg-Zn alloy. Calcium addition causes the formation of ternary Ca2Mg6Zn3 hexagonal phase, denoted also as Ca3MgxZn15-x . The increase of Mg/Zn ratio from 0.59 in Mg-3Zn-0.2Ca wt.% alloy to 2.72 in Mg-3Zn-1.3Ca wt.% alloy in this phase is connected with an increase in the lattice parameters. The microhardness of the Ca containing alloys increases up to 67 HV (for the alloy containing 1.3 wag.% Ca) compared to the 50 HV for Mg-3Zn wt.% alloy.

【 授权许可】

Unknown