Ni-Cu-Ti-Zr계 합금의 비정질 형성능에 미치는 합금원소의 영향

Abstract

The aim of this research was observing the GFA(glass forming ability) by measuring the thermal properties by alloying elements. The thermal properties of the Ni-Cu-Zr-Ti alloy were tested in different contents of Ni and Cu, and the GFA of this alloy is also tested after replacing Ni with Pd. Mother alloys were manufactured by using the vacuum arc melting process, and 1.5×0.02mm ribbons were manufactured by using the rapid solidification process. The phase of the produced ribbons were identified by XRD(X-ray diffractionmeter), and the thermal properties were analyzed by DSC(Differential scanning calorimetry) and DTA(Differential thermal analysis). Typical amorphous halo pattern was observed in the produced Ni-Cu-Zr-Ti alloy ribbons. ΔTx and Trg of Ni55Cu5Zr30Ti10 amorphous alloy was 42K and 0.603, and ΔTx and Trg of Ni10Cu50Zr30Ti10 amorphous alloy was 43K and 0.602. In order to enhance the GFA of Ni-Cu-Zr-Ti alloys which has high GFA, Pd was replaced with Ni. In the case of the Ni(55-x)Cu5Zr30Ti10Pdx amorphous alloys, GFA decreased according to the Pd additions. However, GFA increased in Ni(10-x)Cu50Zr30Ti10Pdx amorphous alloys according to Pd additions. In particular, Ni4Cu50Zr30Ti10Pd4 amorphous alloy showed a high level of GFA with the result, 54K of ΔTx and 0.603 of Trg