摘要
通过铜模铸造的方法制备了直径为3 mm的(Mg0.585Cu0.305Y0.11)100-xBex(x=3,5,7,10)合金的铸态试样。通过X射线衍射、差式扫描量热计、扫描电镜和电子试验机等,研究了合金的相组成、热性能、微观组织和力学性能。结果表明:在Mg-Cu-Y-Be铸态试样中,Mg Cu Y非晶基体里分布着包含Cu Y晶态相的Cu YBe非晶第二相。第二相的数量和尺寸随着Be的加入量的增大而增大。在单轴压缩载荷下,(Mg0.585Cu0.305Y0.11)100-xBex(x=3,5,7,10)合金的压缩断裂强度分别为866、954、1 086、953 MPa,而且在合金断口上观察到了韧性特征。表明Be的加入提高了合金的综合力学性能。
As-cast samples of the （Mg0.585Cu0.305Y0.11）100-xBe.x （x=3,5,7,10） bulk metallic glasses with 3 mm in diameter were fabricated by copper mold casting method.The glass formation,thermal stability,microstructure and mechanical properties of the alloys were investigated by using X-ray diffraction,differential scanning calorimetry,scanning electron microscopy and electronic testing machine.The results show that the Cu-Y-Be glassy phase containing CuY crystals is heterogeneously distributed in the Mg-Cu-Y glassy matrix in the as-cast Mg-Cu-Y-Be samples.The quantity and the size of the second phase is increased with the increase of Be addition.Under uniaxial compressive loading,the compressive fracture strength of the as-cast （Mg0.585Cu0.305 Y0.11）100-xBex （x=3,5,7,10） alloys are 866 MPa,954 MPa,1 086 MPa and 953 MPa,respectively,and the typical characteristic of toughness is observed from the fracture surface.It is indicated the mechanical properties of the alloys are improved due to Be addition.
出处
《铸造》
CAS
CSCD
北大核心
2014年第11期1110-1113,共4页
Foundry
基金
教育部高等学校博士学科点专项科研基金(20132102110005)
关键词
Mg基非晶
Be元素
微观组织
力学性能
Mg-based metallic glass
Be element
microstructure
mechanical properties
