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铪基非晶合金的晶化动力学研究
Crystallization Kinetics of Hf18Be18Ti18Zr18Cu7.5Ni12.5 Bulk Amorphoous Alloy
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- DOI:
- 作者:
- 李梦梦 李炳 范新会 杨柯 李艳红 赵进北
LI Mengmeng;LI Bing;FAN Xinhui;YANG Ke;LI Yanhong;ZHAO Jinbei
- 作者单位:
- 西安工业大学材料与化工学院
College of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China
- 关键词:
- 块体非晶 晶化动力学 晶化体积分数 激活能
bulk amorphous alloy crystallization kinetics crystallization volume fraction activation energy
- 摘要:
- 采用铜模吸铸方法制备了Hf18Be18Ti18Zr18Cu7.5Ni12.5块体非晶合金。并对铪基非晶合金的晶化动力学进行了研究。结果表明,在连续加热的条件下,根据Kissinger和Ozawa两种方法计算了铪基非晶合金的活化能。根据这两个方程的计算,观察到存在相似的值,并且得出Ex小于Ep,说明铪基非晶合金在整个晶化过程中形核所需的激活能小于晶体长大的激活能。在等温条件下,激活能随着晶化体积分数的增加而降低。造成这种现象的原因是晶体的形核和长大引起的。
The Hf18Be18Ti18Zr18Cu7.5Ni12.5 bulk amorphous alloy was prepared by the copper mold suction casting method The crystallization kinetics of hafnium-based amorphous alloys was studied.The results show that the activation energy of hafnium-based amorphous alloy is calculated by Kissinger’s and Ozawa’s methods under the condition of continuous heating.According to the calculation of these two equations,similar values are observed,and Ex is less than Ep,indicating that the activation energy required for nucleation of hafnium amorphous alloy is less than that for crystal growth.Under the isothermal condition,the activation energy decreases with the increase of crystallization volume fraction.This phenomenon is caused by the nucleation and growth of crystals.