Glass formation,thermal and mechanical properties of ZrCuAlNi bulk metallic glasses  

ZrCuAlNi系大块金属玻璃的非晶形成能力、热学和力学性能（英文）

作　　者：C.E.BORJA I.A.FIGUEROA O.LOZADA-FLORES M.ESTRADA G.A.LARA-RODRIGUEZ J.A.VERDUZCO 

机构地区：[1]Instituto de Investigacion en Metalurgia y Materiales,Universidad Michoacana de San Nicolfis de Hidalgo (UMSNH),Fco. J. Mujica S/N, Col. Felicitas del Rio, C.P. 58030, Morelia, Mich., Mexico [2]Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mdxico (UNAM), Circuito Exterior S/N, Cd. Universitaria, C.P. 04510, Cd. Mx., Mexico

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第6期1157-1165,共9页中国有色金属学报（英文版）

基　　金：the financial support from UNAM-DGAPA-PAPIIT thorough the project 101016;CONACYT for the 232312 Ph D scholarship grant

摘　　要：The glass forming ability, thermal and mechanical properties of some Zr Cu Al Ni bulk metallic glasses were analyzed. The compositions of the alloys were theoretically determined with the dense packing and kinetic fragility index models. Cylindrical and conical ingots were produced by copper mould suction-casting under Ar atmosphere. The conical ingots were characterized by means of X-ray diffraction in order to determine the glassy structure. It was found that both alloys have a critical glassy diameter, Dc, of 3 mm. Thermal behaviours were investigated by differential scanning calorimetry at heating rates of 0.5, 0.67 and 0.83 K/s. The gamma parameter γ, supercooled liquid region ΔTx, and reduced glass transition temperature Trg, of the experimentally obtained glasses indicated high glass forming ability. The glassy compositions showed a fragility index of ~40 GPa. The compression test of the investigated alloys was carried out at a strain rate of 0.016 s^-1, obtaining a elastic modulus of ~83 GPa, total deformation of ~5%, yield strength of 1.6 GPa and hardness of 4 GPa. It was concluded that the use of the dense packing and kinetic fragility index models helped to predict glass-forming compositions in the family alloy investigated.分析ZrCuAlNi系大块金属玻璃的非晶形成能力、热学和力学性能。运用密实堆积和动态脆性指数模型从理论上确定合金的成分。采用铜模吸铸法在氩气保护下制备圆柱形和圆锥形铸锭。用X射线衍射表征圆锥形铸锭以便确定非晶结构。结果表明:两种合金的临界非晶直径为3 mm。用差示扫描量热法(DSC)分析其热行为,加热速率分别为0.5、0.67和0.83 K/s。γ参数、过冷液相区ΔT_x和约化玻璃转变温度T_(rg)等这些实验所得的参数均表明其具有高的非晶形成能力。非晶成分显示其脆性指数为40。合金的压缩试验采用的应变速率为0.016 s^(-1),得到弹性模量约为83 GPa,总应变约为5%,屈服强度为1.6 GPa,硬度为4 GPa。运用密实堆积和动态脆性指数模拟可以预测ZrCuAlNi系合金的非晶形成成分。

关 键 词：bulk metallic glass glass formation ability fragility index packing efficiency suction casting 

分 类 号：TG139.8[一般工业技术—材料科学与工程]