MoSi_2/Zr_(55)Al_(10)Ni_5Cu_(30)非晶复合材料的制备与力学性能

Preparation of MoSi_2/Zr_(55)Al_(10)Ni_5Cu_(30) Amorphous Composite and Its Mechanical Properties

采用电弧熔炼铜模吸铸法制备了晶体相增强的锆基非晶合金复合材料。利用金相显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)等方法研究了MoSi2含量对非晶复合材料的显微组织及力学性能的影响。结果表明,MoSi2的加入改变了合金的晶化行为,生成了Zr2(Cu,Si,Al)晶体相,并且随着含量增加,非晶中的晶体相逐渐增多;MoSi2添加量为3%时的锆基非晶合金复合材料压缩强度最高,达到1650 MPa,明显高于不含MoSi2的锆基非晶合金。锆基非晶合金复合材料中晶体相的存在,阻止单一剪切带的扩展,诱发更多剪切带形成,从而提高材料抗压强度。

Zr-based amorphous alloy composite was prepared by arc melting and copper-mold vacuum suction casting. The microstructure and mechanical properties of the composite were characterized by microscope, conventional X-ray diffraction and scanning electron microscope. The results demonstrate that the introduction of MoSi2 changes the crystallization behavior, which can result in the formation of Zr2 （Cu, Si, A1） crystal. Furthermore, the number of crystals increases with the increase of MoSi2. The strength of the composite with 3% MoSi2, which approach 1650 MPa, is higher than that of which without MoSi2. The analysis indicates that the crystal can impede the propagation of shear band and increase the tensile strength of the composite.