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对机械力驱动下Nd16Fe76B8合金的氢化-歧化反应机理进行了研究。通过测量球磨过程中合金的吸氢量变化,揭示了其氢化-歧化反应动力学特征。采用X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)等方法,研究了球磨过程中合金的组织演变。结果表明:在球磨的最初阶段,合金只发生氢化反应,生成NdH2.7与Nd2Fe14BHy相,此后随着球磨时间的延长,氢化态合金粉末在机械球磨的作用下被激活至高能状态,并逐渐发生歧化,最终得到晶粒尺寸约10nm的NdH2.7、Fe2B、α-Fe的纳米歧化组织。
Hydrogenation - disproportionation reaction mechanism of Nd16Fe76B8 alloy under mechanical force was studied. The kinetics of hydrogenation - disproportionation reaction was revealed by measuring the change of hydrogen absorption of the alloy during ball milling. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and other methods were used to study the microstructure evolution of the alloy during ball milling. The results show that only hydrogenation of NdH2.7 and Nd2Fe14BHy occurs in the initial stage of ball milling, and then the hydrogenated alloy powder is activated to high energy state by mechanical milling after gradual milling, and gradually occurs Disproportionation, the final nano-disordered structure of NdH2.7, Fe2B, α-Fe with a grain size of about 10nm.