Y2O3陶瓷粉末及Y对玻璃态Zr55Al15Ni10Cu20材料相析出的影响

在Zr55Al15Ni10Cu20(Zr55)材料中分别添加0.4 at%,1 at%的Y及1 at%,5 at%的Y2O3陶瓷粉末,再通过铜模吸铸得到棒状样品。通过透射电镜(TEM),X射线衍射(XRD),高能X射线和扫描电镜(SEM)观察Y2O3的添加对Zr55Al15Ni10Cu20材料析出相的影响,并进一步研究了随着Y及Y2O3的添加,试样组织形貌的演变过程。研究发现,通过少量Y2O3的添加对Zr55Al15Ni10Cu20试样的玻璃形成能力影响不大。而直接添加Y对Zr55析出相的影响却尤为明显,Y的氧化物更是导致了Zr3Al5相的析出。这对于提高材料的玻璃形成能力起到了一定的限制。透射电镜(TEM)实验直接给出了Y2O3相作为形核核心导致Zr3Al5相析出的证据。

Effect of Yttrium and Y2O3 Ceramic on Glass Forming Ability and Structure Transformation in Zr-based Amorphous

Alloys of nominal composition Zr55Al15Ni10Cu20 had been selected to study the effect of yttrium and yttrium oxide ceramic addition on the glass-forming ability(GFA).0.4 at% yttrium,1 at% yttrium,1 at% and 5 at% Y2O3 ceramic were added to Zr55Al15Ni10Cu20 ingots.Then,these ingots were cast by copper mold suction casting method to form rod-shaped samples.X-ray diffraction(XRD),high-energy diffraction,transmission electron microscopy(TEM),and scanning electron microscopy(SEM) were used to analysis microstructure variation with yttrium and yttrium oxide addition.It is found that Y2O3 had no obviously effect on GFA.However,yttrium addition had negative effect on phase transformation in Zr55Al15Ni10Cu20 alloys,which would decrease glass-forming ability.Transmission electron microscopy(TEM) results suggest that Y2O3 could act as heterogeneous nuclei for(Al,Zr)-riched phase.