【作者】 岳武；

【导师】 寇生中；

【作者基本信息】 兰州理工大学 ， 材料学， 2006， 硕士

【摘要】 本文用水冷铜坩埚悬浮熔炼法在气氛保护下熔炼名义成分（原子百分比）为Cu₅₀Zr₄₂Al₈和Cu₄₇Ti₃₄Zr₁₁Ni₈的两种母合金,利用铜模吸铸法获得直径为φ4mm的棒状合金试样。X射线衍（XRD）分析表明Cu₅₀Zr₄₂Al₈合金为非晶,差示扫描量热曲线（DSC）表明该合金的玻璃转变温度T_g、晶化温度T_x、相温度T_l分别为733K、778K和1173K,过冷液相区宽度AT（AT=T_x-T_g）为45K,表明该合金具有高的非晶形成能力。 通过对工业电炉加热方式的对比,自行设计、制造了一台可用于制备块状非晶的热型连铸装置-真空连铸炉;该炉采用感应加热方式和下引连铸方式,使用高频电源加热,加热时电压最大可达8KV,炉内气压可根据要求调节,调节范围在0.2×10⁵Pa～1.6×10⁵Pa之间,在该设备中连铸直径为φ4～10mm的棒状试样;对影响热型连铸过程的重要工艺参数进行确定;在拉铸速度v为1.8mm/s、型口温度1178K、冷却距离为9mm和冷却流量为2.6L/rain的条件下制备出一段长为8mm、直径为φ4mm的Cu₅₀Zr₄₂Al₈试样,X射线衍射（XRD）分析表明该合金为晶体。 对Cu₅₀Zr₄₂Al₈和Cu₄₇Ti₃₄Zr₁₁Ni₈块状非晶试样在3.5%NaCl水溶液中进行耐腐蚀性试验,腐蚀速度、微观形貌、极化曲线和阻抗谱等结果表明非晶合金Cu₄₇Ti₃₄Zr₁₁Ni₈的耐腐蚀性要优于非晶合金Cu₅₀Zr₄₂Al₈,元素Ti、Ni是形成这种差别的主要因素。通过添加微量元素Cr和Ni,讨论了(Cu₅₀Zr₄₂Al₈)_100-x（Cr₂Ni）₂（x=0,1,2,3,4）的非晶形成能力和热稳定性,对非晶合金Cu₅₀Zr₄₂Al₈和(Cu₅₀Zr₄₂Al₈)₉₈（Cr₂Ni）₂的试样全浸泡120小时后进行腐蚀速度的测定和微观形貌观察,结果表明添加微量元素Cr和Ni可提高Cu₅₀Zr₄₂Al₈在3.5%NaCl水溶液中的耐腐蚀性。更多还原

【Abstract】 In this dissertation, the alloy with composition of Cu₅₀Zr₄₂Al₈ and Cu₄₇Ti₃₄Zr₁₁Ai₈ were synthesized successfully with water cooling copper crucible-suspend melting method in the condition of the argon protection. The rods of 0 4mm were prepared by copper mould casting. X-ray diffraction （XRD） shows that the Cu₅₀Zr₄₂Al₈ samples is amorphous, the different scanning calorimetry （DSC） shows that the glass transition temperature T_g , the crystallization temperature T_x and the liquidtemperature are 733K , 778K and 1173K ,respectively. The temperature interval of the supercooled liquid region AT is 45K, which means that the alloy has higher glass-forming ability.By comparison with the heated method of the industrial furnace, a vacuum furnace for continuous casting, which was used to synthesize the bulk metallic glass, was designed and manufactured by oneself. The heat method of the furnace is induction by high frequency power and the drawing is downward, the maximal volt is 8KV, the pressure in the furnace is adjusted within the range from 0.0 Pa to 0.16xl0⁶Pa, the rods of 0 4 10mm may be prepared. The process parameter of the furnace was studied by experiment. The rod of the length 8mm and the diameter 4mm was prepared in the condition of the pulling speed was 1.8mm/s, the mould temperature was 1195K, the cooling distance was 9mm and the water flux was 2.6L/min. The X-ray diffraction （XRD） shows the sample is crystal.The corrosion resistance of the bulk metallic glass Cu₅₀Zr₄₂Al₈ and Cu₄₇Ti₃₄Zr₁₁Ai₈ were studied in 3.5% NaCl aqueous solution. The corrosion speed, the microscopy, potentiodynamic polarization experiments and electrochemical impedance spectroscopy shows the corrosion resistance of Cu₄₇Ti₃₄Zr₁₁Ai₈ was better than the former. The element Ti and Ni were the important effect. Added the little Cr and Ni into Cu₅₀Zr₄₂Al₈ glass-forming ability and thermal property of the alloy (Cu₅₀Zr₄₂Al₈)₁00-x（Cr₂Ni）_X（X=0,1,2,3,4） was studied. The corrosion speed and microscopy of the bulk metallic glass Cu₅₀Zr₄₂Al₈ and (Cu₅₀Zr₄₂Al₈)98（Cr₂Ni）₂ were inspected after immerged 120h in 3.5% NaCl aqueous solution and shows the corrosion resistance of the bulk metallicglass CusoZ^Alg in 3.5% NaCl aqueous solution may be improved by the little Cr and Ni.更多还原