(1. 沈阳工业大学 材料科学与工程学院，沈阳 110870；
2. 沈阳化工大学 材料科学与工程学院，沈阳 110142；
3. 中国科学院 金属研究所 沈阳材料科学国家(联合)实验室，沈阳 110016)
摘 要: 采用铜模铸造法，制备了直径为2 mm的Zr50.5-xAl9Ni4.05Cu36.45Nbx(x=0，1，2，4，摩尔分数，%)完全非晶棒材。分别采用X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、差示扫描量热计(DSC)和力学性能试验机对合金的相组成、结构、热物性参数和力学性能进行研究。结果表明：添加Nb对所研究合金的玻璃转变温度Tg影响不大，但提高了晶化温度Tx和过冷液相区ΔTx；当x=4时，合金具有最高的玻璃转变温度Tx=773.4 K和最大过冷液相区ΔTx=68.1 K。依据耐温和热塑性成形要求，非晶合金的热稳定性可用玻璃转变温度Tx和过冷液相区ΔTx来分别表示。随着合金中Nb添加量的增加，非晶合金的双重热稳定性提高。非晶合金的断裂强度随着Nb添加量的增加先减小后增加，当x=4时，合金的最高断裂强度为2032 MPa。
关键字: Zr50.5-xAl9Ni4.05Cu36.45Nbx；非晶合金；Nb添加；热稳定性；力学性能
（1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;
3. Shenyang National Laboratory for Material Science, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:Zr50.5-xAl9Ni4.05Cu36.45Nbx(x=0, 1, 2, 4, mole fraction, %) amorphous alloy bar with 2 mm in diameter were fabricated by copper mold casting method. The phase constitution, microstructure, thermal property and mechanical properties of alloys were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and electronic testing machine. The results show that the effect of Nb addition on the glass transition temperature Tg of the alloys is slight. However, the crystallization temperature Tx and supercooled liquid region ΔTx of the alloy obviously increase with increasing the Nb addition. When x is 4, the alloy has the highest glass crystallization temperature (Tx=773.4 K) and largest supercooled liquid region (ΔTx=68.1 K). According to the demand of heat tolerance and thermoplasticity shaping, the thermal stability of amorphous alloy can be represented by Tx and ΔTx, respectively. And for this investigated system, the thermal stability of amorphous alloy can be enhanced by increasing the Nb content. The fracture strength decreases first and then increases with increasing the Nb content, and the fracture strength reaches the highest value of 2032 MPa while x is 4.
Key words: Zr50.5-xAl9Ni4.05Cu36.45Nbx; amorphous alloy; Nb addition; thermal stability; mechanical property
