铁基块体非晶合金的制备及其晶化动力学  

Preparation and crystallization kinetics of Fe-based bulk amorphous alloy

作　　者：何世文[1] 朱艺添[2] 刘咏[2] 

机构地区：[1]湖南工业大学冶金工程学院,湖南株洲412000 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《材料热处理学报》2010年第7期10-14,共5页Transactions of Materials and Heat Treatment

基　　金：国家"863"计划基金项目(2003AA302520)

摘　　要：采用工业用原材料在铜模吸铸条件下制备了直径为2 mm的Fe50 Co7Ni13 Zr10 B20块体非晶合金。利用X射线衍射仪(XRD)、差分扫描量热计(DSC)对铸态样品的结构、非晶合金的热稳定性、晶化动力学行为进行了研究。该合金的玻璃转变温度Tg、初始晶化温度Tx1、过冷液相区△Tx1、约化玻璃转变温度Trg分别为804 K、875 K、71 K和0.59。采用连续加热方法对其晶化动力学进行了研究,得到其玻璃转变激活能和晶化峰激活能分别为339.2 kJ/mol和326.4 kJ/mol,表明合金具有强的热稳定性。由VFT方程拟合获得该非晶合金的脆性参数m为23。Fe50Co7Ni13Zr10B20 bulk amorphous alloy with a diameter of 2 mm was fabricated by the method of copper mould suction casting using commercial materials.The amorphous state was indicated by X-ray diffraction（XRD）.The thermal stability parameters,such as glass transition temperature（Tg）,crystallization onset temperature（Tx1）,supercooled liquid region（△Tx1 = Tx1-Tg）,and reduced glass transition temperature（Trg = Tg /Tm） were measured by differential scanning calorimetry（DSC） to be 804 K,875 K,71 K and 0.59,respectively.The crystallization kinetics of the bulk amorphous alloy was investigated by DSC in the mode of continuous heating.The activation energies for glass transition and crystallization of the amorphous alloy are 339.2 kJ /mol and 326.4 kJ /mol,respectively.The research results show that the thermal stability of Fe50 Co7 Ni13 Zr10 B20 bulk amorphous alloy is very high.The fragility parameters m of the bulk-metallic glass（BMG） fitted by the Vogel-Fulcher-Tamman（VFT） equation is 23.

关 键 词：铁基非晶合金 非晶形成能力 热稳定性 晶化动力学 

分 类 号：TG139.8[一般工业技术—材料科学与工程]