摘要
用真空吹铸法制备了直径2 mm的Mg65Cu25Y6Gd4与Mg65Cu25Gd10块体非晶合金棒,采用X射线衍射分析(XRD)、差热分析(DTA)分别对非晶合金的结构和形成能力进行了研究.以Mg65Cu25Y6Gd4与Mg65Cu25Gd10大块非晶合金DTA实验为基础,利用Kissinger方程对其玻璃转变的动力学性质从不同方面进行了研究.分析结果表明:玻璃转变表观激活能与频率因子v0越小,玻璃转变处Lasocka关系的B值越大,则对于同一合金系表现出玻璃形成能力(GFA)越强,这一现象是由于大块非晶合金独特的结构特点所引起的.
2 mm diameter rods of Mg65 Cu25 Y6 Gd4 and Mg65 Cu25Gd10 bulk amorphous alloys were prepared by copper mold casting method. The structure and glass-forming ability of the alloys were analyzed by X- ray diffraction （XRD） and differential thermal analysis （DTA）, respectively. The kinetic property during the glass transition process of Mg65 Cu25 Y6Gd4 and Mg65 Cu25 Gd10 amorphous alloys was systematically investigated by differential thermal analysis method. The results revealed that the smaller the activation energy and the frequency factor and the bigger the B value of Lasocka function were, the stronger the glassforming ability of bulk amorphous alloys would be. This phenomenon was caused by the unique structural feature of the bulk amorphous alloy.
出处
《兰州理工大学学报》
CAS
北大核心
2006年第4期1-4,共4页
Journal of Lanzhou University of Technology
基金
甘肃省自然科学基金(ZS032-B25-018)
关键词
玻璃转变
玻璃形成能力
表观激活能
频率因子
glass transition
glass-forming ability
activation energy
frequency factor
