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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。
The amorphous Mg65Cu25Y10 alloy ribbons were prepared by rapid solidification technique with single roll rejection method. The glass forming ability and thermal stability of amorphous ribbons were analyzed by X-ray diffractometer and differential scanning calorimeter. The Kissinger method And Ozawa method to calculate the apparent activation energy of Mg65Cu25Y10 amorphous alloy. The results show that Mg65Cu25Y10 amorphous alloy possesses strong glass forming ability. The width of supercooled liquid region is between 42 and 56 K, and the reduced glass transition temperature is 0.52. The thermal stability of Mg65Cu25Y10 amorphous alloy is high, and its glass transition activation energy and initial crystallization activation energy are 352.0 and 137.5 kJ / mol, respectively. The peak activation energies of the two crystallization peaks are 61.2 kJ / mol and 81.4 kJ / mol, respectively . The glass transition and crystallization of Mg65Cu25Y10 amorphous alloy both have kinetic effect. As the heating rate increases, the characteristic transition temperature of amorphous alloy moves to high temperature.