机械合金化制备Fe-Co系非晶合金

在高纯氩气保护下采用高能球磨法对原子组成为Fe44Co44Zr3.5Nb3.5B4Cu1的混合粉末进行机械合金化(MA)实验,成功地制取了非晶合金粉末.利用X射线衍射(XRD)、扫描电镜(SEM)、差热分析(DTA)对其进行测试,结果表明:Fe-Co系的混合粉末在MA过程中,通过原子之间的相互固溶、扩散可形成非晶态.此非晶合金的形成是晶粒细化、球磨过程中的缺陷、应力和致密堆垛结构等多种因素综合作用的结果,这与机械合金化的合成机理之一的扩散型机制相吻合.用非晶化的热力学条件判据和动力学条件判据对此合金进行计算,其结果也表明此合金已非晶化.

Preparation of Fe-Co based amorphous alloy by mechanical alloying

Mechanical alloying of Fe-Co based powder,via high-energy ball milling under the protection of high purity Ar atmosphere,has been studied by X-ray diffraction(XRD),scanning electron microscopy(SEM)and differential thermal analyzer(DTA).It is found that the Fe44Co44Zr3.5Nb3.5B4Cu1 mixed powder can be changed to amorphous phase powder by atomic diffusion during the mechanical alloying process.The amorphous phase powder's forming mechanism relates with the comprehensive applications of a variety of factors including the crystal size,defect,stress and high local packing density during ball milling,which accords with another mechanical alloying mechanism,namely the diffusion mechanism.At the same time,the verification results based on the thermodynamics and kinetics criterion also show that the Fe44Co44Zr3.5Nb3.5B4Cu1 mixed powder has changed to amorphous alloy phase.