摘要
The effects of yttrium addition on microstructure and mechanical properties of as-extruded AZ31 magnesium alloys were investigated by OM,XRD and SEM.The results show that the addition of yttrium results in the formation of a new phase,Al_2Y. When the addition of yttrium is higher than 1.48%-2.91%(mass fraction),another new phase,Al_3Y_5Mn_7,forms,and the amount ofβ-Mg_(17)Al_(12) phase in the AZ31 alloy decreases sharply.The tensile test at room temperature indicates that the yield strength of as-extruded AZ31 alloys improves with the addition of yttrium,but the elongation decreases,which is possibly related to the formation of coarse blocky compounds containing yttrium and the grain coarsening in the alloys.
The effects of yttrium addition on microstructure and mechanical properties of as-extruded AZ31 magnesium alloys were investigated by OM, XRD and SEM. The results show that the addition of yttrium results in the formation of a new phase, Al2Y. When the addition of yttrium is higher than 1.48%-2.91% （mass fraction）, another new phase, Al3Y5Mn7, forms, and the amount of β-Mg17Al12 phase in the AZ31 alloy decreases sharply. The tensile test at room temperature indicates that the yield strength of as-extruded AZ31 alloys improves with the addition of yttrium, but the elongation decreases, which is possibly related to the formation of coarse blocky compounds containing yttrium and the grain coarsening in the alloys.
出处
《中国有色金属学会会刊：英文版》
CSCD
2008年第A01期1-6,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(50725413)supported by the National Natural Science Fundation of China
Project(2007CB613704)supported by the NationalBasic Research Program of China
关键词
镁合金
稀有金属
微观结构
调查
研究
magnesium alloys
yttrium
microstructure
mechanical properties
