铁基块体非晶合金的形成能力与制备研究

【作者】 赵德强；

【导师】 杨元政；

【作者基本信息】 广东工业大学 ， 材料学， 2004， 硕士

【摘要】 本文采用多种方法设计了Fe₆₅Ni₆Zr₅W₄B₂₀、Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅、Fe₆₁Co₁₀Zr₅W₄B₂₀、Fe₆₀Co₈Zr₈Mo₅W₂Nb₂B₂₀等一系列的铁基合金成分。利用低纯度的原材料通过铜模真空吸铸法成功制备了直径尺寸为2mm的Fe₆₅Ni₆Zr₅W₄B₂₀、Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅、Fe₆₁Co₁₀Zr₅W₄B₂₀、Fe₆₀Co₈Zr₈Mo₅W₂Nb₂B₂₀等一系列铁基合金。X射线衍射（XRD）、扫描电子显微镜（SEM）和示差扫描分析（DSC）研究表明：Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅、Fe₆₁Co₁₀Zr₅W₄B₂₀、Fe₆₀Co₈Zr₈Mo₅W₂Nb₂B₂₀等合金具有较高的非晶形成能力。利用多重扫描速率的非等温法（Kissinger法和Ozawa法）研究了Fe₆₁Co₁₀Zr₅W₄B₂₀和Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅块体非晶合金的晶化动力学，并研究了等温退火下的晶化行为。同时也对其部分力学性能进行了分析。本文的研究结果表明： （1）Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅、Fe₆₁Co₁₀Zr₅W₄B₂₀、Fe₆₀Co₈Zr₈Mo₅W₂Nb₂B₂₀等合金具有较强的非晶形成能力。其中Fe₆₁Co₁₀Zr₅W₄B₂₀和Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅合金的玻璃转变温度T_g、晶化起始温度T_x、过冷液相区ΔT_x、晶化焓ΔH_c如下表： （2）Fe₆₁Co₁₀Zr₅W₄B₂₀和Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅块体非晶合金的T_g、T_x和晶化峰值温度T_p等热力学参数均具有明显的动力学效应。 （3）Fe₆₁Co₁₀Zr₅W₄B₂₀块体非晶合金在各阶段的激活能分别采用Kissinger法、Ozawa法和Broido法计算得出，如下表： Fe₆₀Co₈Zr₁₀Mo₅W₂B₁₅块体非晶合金在各阶段的激活能分别采用Kissinger法、Ozawa法计算得出，如下表：广东工业大学工学硕士学位论文 .巴巴巴..巴巴，.巴巴思巴.巴巴.巴，.巴巴.巴巴巴一-----.一-.一-..-.一..-........-.一..-..一..-...-.-.一-一一晶化激活能瓦ssing。:法Eg（kJ/m 01）E、（kJ/m 01）E。（kJ/mol） 卜︸0︸4Ozawa法496.9482.2151.154.209.82 1 0.4 （4）Fe。、ICo，。Zr5W4BZ。和Fe6oCosZrloMo5WZB15块体非晶合金的压缩断裂方式均为脆性断裂。热处理后断裂强度下降明显。Fe6，ColoZr5W礴BZ。块体非晶合金和经不同温度等温退火60min的抗压强度仇。和相对压缩率。。如下表:温度（℃）ab。（MPa）未处理1707.61426.8952.6e（（%）0 .0690 .0530 .054FeoCoszrl.）Mo5WZB15块体非晶合金和经不同温度等温退火60Inin的甄和。。值如下表:温度（℃）ab。（Mpa）未处理972.6736.7508.8 （5）1207HVe‘:（%）0.059 0.034 0.036F饰leolozr5W4B加和Fe印CoszrloMo5WZB15块体非晶合金显微硬度分别为和1343 HV。等温退火后其显微硬度有所增加。更多还原

【Abstract】 In this paper, several methods were used to design a series of Fe65Ni6Zr5W4B20, Fe60Co8Zr10Mo5W2B15, Fe61Co10Zr5W4B20, Fe60Co8Zr8Mo5W2Nb2B20 alloys. These bulk amorphous alloys with maximum diameter thickness reaching to 2mm were prepared by means of copper-mold vacuum suction casting though the raw materials are of a low purity. The results from x-ray diffraction (XRD), scanning electron microscope (SEM) and differential scanning calorimeter (DSC) demonstrate that these alloys exhibit a higher glass forming ability. DSC was used to study the crystallization kinetics of Fe61Co10Zr5W4B20 and Fe60Co8Zr10Mo5W2B15 bulk amorphous alloys by Kissinger and Ozawa equations under non-isothermal conditions, respectively. The isothermal crystallization behaviors of the two bulk amorphous alloys have been also studied. Moreover, some mechanical properties of the two amorphous alloys have been analyzed. The following results have been obtained:(1) Fe65Ni6Zr5W4B20, Fe61Co10Zr5W4B20 and Fe60Co8Zr10Mo5W2B15 bulk amorphous alloys have a higher glass forming ability (GFA). The glass transition temperature (Tg), the onset temperature (Tx) of crystallization and the supercooled liquid region ( TX= Tx -Tg) are listed as below:(2) Significant kinetic effect has been found in the glass transition temperature Tg, the onset temperature Tx of crystallization and the peak temperature Tp of crystallization.(3) Apparent activation energy of crystallization of Fe61Co10Zr5W4B20 bulk amorphous alloy has been obtained with Kissinger, Ozawa and Broido equations:(4) The compressive fracture of Fe61Co10Zr5W4B2o and bulk amorphous alloys shows a feature of brittle fracture. The compressive fracture strength ( bc) will decrease abviously after annealed. bc and compression ratio ( c) ofFe61Co10Zr5W4B20 bulk amorphous alloy are listed as follows:(5) Microhardness of Fe6iCoioZr5W4B2o and Fe60CogZr10Mo5WaB15 bulk amorphous alloys are about 1207 HV and 1343 HV, repectively. Moreover, the microhardness will increase after annealed.更多还原