金属ガラスの精密・微細加工に関する基礎的研究 : Zr基バルク金属ガラスの引張変形挙動

概要

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Deformation behavior of Zr based bulk metallic glass ; Zr_<55>Cu_<30>Al_<10>Ni_5 (atomic %) under tensile stress at the supercooled liquid region was observed. The bulk metallic glass was produced by die casting into a copper mold at vacuum atmosphere. The amorphicity of cast bulk alloy and the crystallization behavior of the amorphous phase were tested by X-ray diffraction (XRD) and differential scanning calorimeter (DSC) respectively. Machined specimen was tensed at 713 K, 723 K and 733 K (in the supercooled liquid region) at various strain rates between 4.25 × 10^<-3> s^<-1> and 2.90 × 10^<-1> s^<-1>. The supercooled liquid exhibited a Newtonian viscosity and superplastic-like behavior during tensile deformation. The bulk metallic glass was elongated as much as 1 000% at high strain rates ranging from 2.50 × 10^<-2> s^<-1> to 2.00 × 10^<-1> s^<-1>. The largest elongation reached 1 700%, and the smallest breaking diameter was 27 μm. However, crystallization in tested specimen was observed. The crystallization of this bulk metallic glass has a tendency to be promoted under tensile deformation.
一般社団法人日本機械学会の論文
2001-08-25