一种新的Cu基大块非晶合金非等温晶化动力学研究

稀有金属材料与工程, 2014, 43(10): 2450-2454.

一种新的Cu基大块非晶合金非等温晶化动力学研究

张香云 ^1, , 袁子洲 ^2, , 冯雪磊 ^3, , 崔立志 ^4,

1.兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

2.兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

3.兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

4.兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

基金项目: 国家自然科学基金(51061008)

关键词：晶化机制 , 晶化激活能 , 大块金属玻璃 , 晶化动力学

Kinetic Analysis of the Non-isothermal Crystallization of a New Cu-Based Bulk Metallic Glass

Keywords： precipitation mechanism , activation energy , bulk metallic glass , crystallization kinetics

采用铜模吸铸法制备了Cu56.4Zr31.02Ti6.58Al6大块非晶合金(BMGs),并利用X射线衍射仪(XRD)、透射电子显微镜(TEM)和同步示差扫描量热仪(DSC)等手段对其晶体结构、晶化激活能和晶化机制进行了研究.利用y(a)和z(a)判据检测了不同晶化模型对于该BMGs初始晶化相晶化过程的适用性.结果显示:该BMGs初晶晶化产物为Cu10Zr7相,Starink-Zahra模型可以很好地描述其晶化机制.拟合参数λ1不为零,故晶化过程中软碰撞作用不可忽视;Avrami指数n由2.5减小为2.3,其晶化过程为连续形核过程中伴随着晶核受扩散控制的三维方式长大,且形核速率不断减小.

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