摘要
The mechanical properties of the Mg97ZnlY2 extruded alloy containing the long-period stacking ordered phase, the so-called LPSO-phase, with a volume fraction of 24%-25%, were examined by compression tests and cyclic tension-compression deformation tests. The plastic behavior of the extruded alloys with compositions of Mg99.2Zn0.2Y0.6 and Mg89Zn4Y7 （molar fraction, %）, which were almost the same compositions of Mg matrix phase and LPSO phase in Mg97Zn1Y2 Mg/LPSO two-phase alloy, respectively, were also prepared. By comparing their mechanical properties, the strengthening mechanisms operating in the Mg97Zn1 Y2 extruded alloy were discussed. Existence of the LPSO-phase strongly enhanced the refinement of Mg matrix grain size during extrusion, which led to a large increment of the strength of alloy. In addition, the LPSO-phases, which were aligned along the extrusion direction in Mg97Zn1Y2 extruded alloy, acted as hardening phases, just like reinforced fibers.
The mechanical properties of the Mg97Zn1Y2 extruded alloy containing the long-period stacking ordered phase,the so-called LPSO-phase,with a volume fraction of 24%-25%,were examined by compression tests and cyclic tension-compression deformation tests.The plastic behavior of the extruded alloys with compositions of Mg99.2Zn0.2Y0.6 and Mg89Zn4Y7(molar fraction,%) ,which were almost the same compositions of Mg matrix phase and LPSO phase in Mg97Zn1Y2 Mg/LPSO two-phase alloy,respectively,were also prepared.By comparing their mechanical properties,the strengthening mechanisms operating in the Mg97Zn1Y2 extruded alloy were discussed.Existence of the LPSO-phase strongly enhanced the refinement of Mg matrix grain size during extrusion,which led to a large increment of the strength of alloy.In addition,the LPSO-phases,which were aligned along the extrusion direction in Mg97Zn1Y2 extruded alloy,acted as hardening phases,just like reinforced fibers.
基金
supported by the project"Development of Key Technology for Next-generation Heat-resistant Magnesium Alloys,Kumamoto Prefecture Collaboration of Regional Entities for the Advancement of Technological Excellence"from Japan Science and Technology Agency
by funds from the"Priority Assistance of the Formation of Worldwide Renowned Centers of Research-The 21st Century COE Program and Global COE Program(Project:Center of Excellence for Advanced Structural and Functional Materials Design)"
a Grant-in-Aid for Scientific Research and Development from the Ministry of Education,Culture,Sports,Science and Technology of Japan
