【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.更多还原

【Abstract】 2 mm diameter rods of Mg₆₅Cu₂₅Y₆Gd₄ and Mg₆₅Cu₂₅Gd₁₀ 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 Mg₆₅Cu₂₅Y₆Gd₄ and Mg₆₅Cu₂₅Gd₁₀ 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 glass-forming ability of bulk amorphous alloys would be.This phenomenon was caused by the unique structural feature of the bulk amorphous alloy.更多还原