Investigation On Preparing And Properties Of New Nickel-Based Amorphous Alloys

By employing the X-ray diffraction(XRD), differential scanning calorimetry (DSC), scanning electron microscope(SEM), vibrating sample magnetometer(VSM) and potentiodynamic polarization method at room temperature, the effect of Rare Elements Er of addition for Ni₅₈Ta₃₆Sn₆ amorphous alloy on the glass forming ability (GFA) , corrosion behavior and magnetic properties has been systematically investigated. In addition, based on uniquely rule, that constitutes elements of ternary nickel-based amorphous alloys has periodicity, the new ternary Ni-Zr-Sn amorphous formation system has been investigated. By the X-ray diffraction, differential scanning calorimetry and scanning electron microscope defined optimization composition range of Ni-Zr-Sn amorphous formation system. By employing the vibrating sample magnetometer(VSM) and potentiodynamic polarization method at room temperature, the corrosion and magnetic properties has been systematically investigated. Based on above-mentioned investigations, the following results can be obtained:The different content of Rare Elements Er (1% and 2% at.) had significant influence on the glasses forming ability of Ni₅₈Ta₃₆Sn₆ amorphous alloy. The intensity and broad of dispersion peaks of (Ni₅₈Ta₃₆Sn₆)₉₉Er₁ and (Ni₅₈Ta₃₆Sn₆)₉₈Er₂ alloys ribbons of XRD curves were better than the other. The differential scanning calorimetry curve measuring indicates that the values of glass transition temperature(T_g) and crystallization temperature(T_l) increase with additive content of Er atom, but the wide supercooled liquid temperature(ΔT_x) of (Ni₅₈Ta₃₆Sn₆)₉₈Er₂ smaller thanΔT_x of (Ni₅₈Ta₃₆Sn₆)₉₉Er₁ alloy ribbons. The values of parameters T_rg,γandβof (Ni₅₈Ta₃₆Sn₆)₉₉Er₁ alloy ribbons were most. The X-ray diffraction and differential scanning calorimetry curves measuring indicates that the glasses forming ability of (Ni₅₈Ta₃₆Sn₆)₉₉Er₁ better than Ni₅₈Ta₃₆Sn₆, the same with conclusion by scanning electron microscope, the critical amorphous range of diameter 3mm(Ni₅₈Ta₃₆Sn₆)₉₉Er₁ sample reached to 0.5mm, and 0.1mm of Ni₅₈Ta₃₆Sn₆ sample. Corrosion resistance of (Ni₅₈Ta₃₆Sn₆)_100-xEr_x(0,1,2,3,5 at.) amorphous ribbons in several kinds of solutions were studied by weight loss measurement and potentiodynamic polarization method at room temperature. The experiments showed that alloys exhibit good corrosion resistance. The addition of Er has enhanced corrosion resistance of Ni-Ta-Sn amorphous ribbons in acid, alkali and salt solvents, specially, in alkali solvents. The magnetic properties of (Ni₅₈Ta₃₆Sn₆)_100-xEr_x(0,1,2 at.) ribbons were significantly affected by content of Er by VSM. The Ni₅₈Ta₃₆Sn₆ sample was ferromagnetic, but the saturation magnetization very feebleness, whereas (Ni₅₈Ta₃₆Sn₆)₉₉Er₁ and (Ni₅₈Ta₃₆Sn₆)₉₈Er₂ alloys ribbons were paramagnetic, the susceptibility decrease with Er.A new ternary Ni-Zr-Sn amorphous formation system, was explored. There exists a narrow amorphous forming regime, in at.%, 5862Zr₃₃Sn₅ sample were the highest in the system, whereas Ni₅₉Zr₃₃Sn₈ composition closed to eutectic composition, by reason of least liquid phase temperatureT_l=1417.56K) and single exothermic peak. The values of parameters T_rg,γandβof Ni₅₉Zr₃₃Sn₈ alloy ribbons were maximum, that predicate Ni₅₉Zr₃₃Sn₈ alloy has the best glass-forming ability, accompanied by scanning electron microscope. Electrochemistry test showed that Ni₅₉Zr₈₈Sn₈ and Ni₅₉Zr₃₃Sn₈ alloys taken on similar behavior in acid, alkali and salt solvents, only acid-resistant and salt-resistant of Ni₅₉Zr₃₃Sn₈ amorphous is better, but alkali-resistant is lower. The vibrating sample magnetometer test showed Ni₅₉Zr₃₉Sn₈ sample was ferromagnetic, but the saturation magnetization was very feebleness.