Zr50Ti5Cu18Ni17Al10块体非晶合金的热稳定性
Thermal Stability of Zr50Ti5Cu18Ni17Al10 Bulk Amorphous Alloy
胡勇,闫红红,闫志杰，党淑娥，李永堂
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作者单位：太原科技大学材料科学与工程学院，山西 太原 030024
中文关键字：块体非晶合金；热稳定性；晶化；Kissinger方法
英文关键字：Bulk amorphous alloy; Thermal stability; Crystallization; Kissinger method
中文摘要：采用铜模吸铸法制备了Zr50Ti5Cu18Ni17Al10块体非晶合金，并采用差示扫描量热仪（DSC）和X射线分析（XRD）对其热稳定性进行了系统研究。结果表明，随着加热温度的提高，玻璃转变温度Tg、晶化开始温度Tx和峰值温度T
p均向高温区移动，说明该合金的玻璃转变和晶化均为动力学过程。用Kissinger方法计算出玻璃转变激活能（Eg）以及晶化激活能（Ep1和Ep2）分别为438±11、284±8和323±11 kJ/mol。该合金的晶化过程分为纳米晶析出、初生相（ZrAl、ZrCu和Zr2Ni）析出以及稳定相（Zr2Cu、Zr2Ni、ZrCu、ZrAl和一个未知相）析出3个阶段。
英文摘要：Bulk amorphous alloy Zr50Ti5Cu18Ni17Al10 was prepared by copper mold suckcasting method, and the thermal stability was investigated by use of differential scanning calorimeter (DSC) and Xray diffractometer (XRD
). The glass transition temperature (Tg), the crystallization onset temperature (Tx) and peak temperatures (Tp) shift to the high temperature region with the increase of heating rate, indicating the glass transition and crystallization are kinetic processes. The activation energies of glass transition (Eg) and crystallization (Ep1 and Ep2) are 438±11、 284±8 and 323±11 kJ/mol, respectively, calculated by Kissinger method. The crystallization of the amorphous alloy is divided into three processes: the precipitation of the nanocrystals, the primary phase (ZrAl, ZrCu and Zr2Ni) and the stable phase (Zr2Cu, Zr2Ni, ZrCu, ZrAl and an unkown phase).