【摘要】 利用单辊甩带法快速凝固技术制备Mg65Cu25Y10合金非晶薄带,采用X射线衍射仪、差示扫描量热仪对非晶薄带的玻璃形成能力及其热稳定性进行了分析,通过Kissinger法和Ozawa法计算了Mg65Cu25Y10非晶合金的表观激活能。结果表明,Mg65Cu25Y10非晶合金具有较强的玻璃形成能力,其过冷液相区宽度值在42~56 K之间,约化玻璃转变温度为0.52。Mg65Cu25Y10非晶合金的热稳定性较高,其玻璃转变激活能和起始晶化激活能分别为352.0、137.5 kJ/mol,两个晶化峰值激活能分别为61.2 kJ/mol和81.4 kJ/mol。Mg65Cu25Y10非晶合金的玻璃化转变和晶化均具有动力学效应,随着升温速率提高,非晶合金的特征转变温度向高温区移动。更多还原

【Abstract】 The Mg65 Cu25 Y10 alloy amorphous ribbons were prepare d by single-roller rapidly solidification method, the glass-forming ability and thermal stability of the ribbons were analyzed by means of XRD and DSC. Both the Kissinger method and Ozawa method were used to calculate the apparent activation energies for crystallization of the amorphous ribbons. The results show that Mg65 Cu25 Y10 alloy has good glass-forming ability, its supercooled liquid region width value is between 42 K and 56 K, the reduced glass transition temperature is 0.52. The amorphous ribbons have high thermal stability, the glass transition activation energy and start crystallization activation energy are 352.0 kJ/mol and 137.5 kJ/mol, respectively. The activation energies Ep1 and Ep2 of the two crystallization peaks are 61.2 kJ/mol and 81.4 kJ/mol, respectively. As heating rate increasing, the glass transition temperature, start crystallization temperature and crystallization peak temperatures of the Mg65 Cu25 Y10 amorphous alloy increases, which suggested that both the glass transition and crystallization behavior of the amorphous alloys have typical kinetic characteristics.更多还原