CAJ | 학술논문

研究钇含量对Mg-xY- 1.5LPC-0AZr镁合金的时效硬化、显微组织和力学性能的影响(其中LPC代表富镧混合稀土金属).当将Y加入Mg- 1.5LPC-0.4Zr时,随着Y含量的增加,合金的时效硬化反应相应增强,晶粒尺寸变小,强度增加.当将Y添加到Mg -1.5LPC-0.4Zr合金中时,时效析出相发生改变,由Mg-LPC基合金的稳态Mg12RE相转变为Mg-Y基合金的亚稳态β'相,且随着Y含量的增加,β’相的数量也相应增多.在合金晶界上还发现了稳态立方形的β-Mg24Y5相.对于Mg-Y-LPC-Zr合金,拉伸性能的改善主要归功于均匀、弥散分布的β’相,在晶界上的β-Mg24Y5相对合金的晶界也有明显的强化作用.当Y含量达到6％时,合金的拉伸强度最大,合金在室温和250℃的抗拉强度分别是250 MPa和210 MPa.
연구을함량대Mg-xY- 1.5LPC-0AZr미합금적시효경화、현미조직화역학성능적영향(기중LPC대표부란혼합희토금속).당장Y가입Mg- 1.5LPC-0.4Zr시,수착Y함량적증가,합금적시효경화반응상응증강,정립척촌변소,강도증가.당장Y첨가도Mg -1.5LPC-0.4Zr합금중시,시효석출상발생개변,유Mg-LPC기합금적은태Mg12RE상전변위Mg-Y기합금적아은태β'상,차수착Y함량적증가,β’상적수량야상응증다.재합금정계상환발현료은태립방형적β-Mg24Y5상.대우Mg-Y-LPC-Zr합금,랍신성능적개선주요귀공우균균、미산분포적β’상,재정계상적β-Mg24Y5상대합금적정계야유명현적강화작용.당Y함량체도6％시,합금적랍신강도최대,합금재실온화250℃적항랍강도분별시250 MPa화210 MPa.
Ageing hardening,microstructure and mechanical properties of Mg-xY-1.5LPC-0.4Zr (x=0,2,4,6) alloys (LPC represents La-based rare earth metal) were investigated.It was found that the age hardening was enhanced,the grains became finer and the tensile strength was improved with the increase of Y content in Mg-Y-1.5LPC-0.4Zr alloy.The results show that the formed precipitates responsible for age hardening change from fine hexagonal-shaped equilibrium Mg12RE phase to metastable β' phase with orthorhombic-bc crystal structure when Y is added into Mg-1.5LPC-0.4Zr alloy,and the volume fraction of precipitate phases also increases.The cubic-shaped β-Mg24Y5 precipitate phases were also observed at grain boundaries in Mg-6Y-1.5LPC-0.4Zr alloy.The distribution of prismatic shaped β' phases and cubic shaped β-Mg24Y5 precipitate phases in Mg matrix may account for the remarkable enhancement of tensile strength of Mg-Y-LPC-Zr alloy.The Mg-6Y-1.5LPC-0.4Zr alloy exhibits maximum tensile strength at peak-aged hardness,and the values are 250 MPa at room temperature and 210 MPa at 250 ℃.