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为研究热变形工艺对纳米晶Nd-Fe-B磁体性能的影响,对快淬磁粉在真空环境中热挤压成全密度各向同性进行了压坯,并在不同温度和应变率下研究了热变形实验,对制备的磁体进行磁性能和XRD测试。通过分析不同变形温度和变形速率的热变形过程中磁体内流动应力和应变的关系,得到了影响磁体织构和磁性能的最佳工艺参数,分析了热变形过程的变形机理并由此得到描述磁体塑性变形过程的关键参数。确定了变形过程中的液态富Nd边界相虽然不是发生变形和形成织构所必须的,但是作为加快扩散速率的扩散通道在变形过程中起着重要的作用。
In order to study the effect of thermal deformation process on the properties of nanocrystalline Nd-Fe-B magnets, the hot-pressed magnetic powder was hot-pressed into vacuum at full density and wasotropically compressed at different temperature and strain rate Deformation experiment, the preparation of the magnetic properties of magnets and XRD test. By analyzing the relationship between the flow stress and strain in the magnet during the thermal deformation process under different deformation temperature and deformation rate, the optimum technological parameters affecting the texture and magnetic properties of the magnet were obtained. The deformation mechanism of the thermal deformation process was analyzed and the description was made Magnet plastic deformation process of the key parameters. It is confirmed that the liquid-rich Nd-rich boundary phase in the deformation process is not necessary for deformation and texture formation. However, the diffused channel, which accelerates the diffusion rate, plays an important role in the deformation process.