Microstructure and mechanical properties of Mg-xY-1.5MM-0.4Zr alloys
来源期刊：Journal of Rare Earths2011年第5期
论文作者：王军 朱秀荣 王荣 徐永东 聂景江 凌国平
文章页码：454 - 459
摘 要：Age hardening,microstructure and mechanical properties of Mg-xY-1.5MM-0.4Zr （x=0,2,4,6 wt.%） alloys （MM represents Ce-based misch-metal） were investigated by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results showed that the formed precipitates being responsible for age hardening changed from fine hexagonal-shaped equilibrium Mg12MM phase to metastable β’ phase with bco crystal structure when Y was added into Mg-1.5MM-0.4Zr alloy,and the volume fraction of precipitate phases also increased. With the increase of Y content in Mg-Y-1.5MM-0.4Zr alloys,it was found that the age hardening was enhanced,the grain sizes became finer and the tensile strength was improved. The cubic-shaped β-Mg24Y5 precipitate phases were observed at grain boundaries in Mg-6Y-1.5MM-0.4Zr alloy. It was suggested that the distribution of prismatic shaped β’ phases and cubic shaped β-Mg24Y5 precipitate phases in Mg matrix might account for the remarkable enhancement of tensile strength of Mg-Y-MM-Zr alloy. It was shown that the Mg-6Y-1.5MM-0.4Zr alloy was with maximum tensile strength at aged-peak hardness,UTS of 280 MPa at room temperature and 223 MPa at 250 oC,respectively.
王军1,2，朱秀荣2，王荣2，徐永东2，聂景江2，凌国平1
1. Zhejiang University2. Ningbo Branch of China Ordnance Academy
摘 要：Age hardening,microstructure and mechanical properties of Mg-xY-1.5MM-0.4Zr （x=0,2,4,6 wt.%） alloys （MM represents Ce-based misch-metal） were investigated by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results showed that the formed precipitates being responsible for age hardening changed from fine hexagonal-shaped equilibrium Mg12MM phase to metastable β’ phase with bco crystal structure when Y was added into Mg-1.5MM-0.4Zr alloy,and the volume fraction of precipitate phases also increased. With the increase of Y content in Mg-Y-1.5MM-0.4Zr alloys,it was found that the age hardening was enhanced,the grain sizes became finer and the tensile strength was improved. The cubic-shaped β-Mg24Y5 precipitate phases were observed at grain boundaries in Mg-6Y-1.5MM-0.4Zr alloy. It was suggested that the distribution of prismatic shaped β’ phases and cubic shaped β-Mg24Y5 precipitate phases in Mg matrix might account for the remarkable enhancement of tensile strength of Mg-Y-MM-Zr alloy. It was shown that the Mg-6Y-1.5MM-0.4Zr alloy was with maximum tensile strength at aged-peak hardness,UTS of 280 MPa at room temperature and 223 MPa at 250 oC,respectively.
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