【摘要】 为了研究纳米晶Nd-Fe-B磁体的热变形机理,在不同温度下对快淬粉进行热压热变形处理。通过分析不同温度下热变形过程中应力和磁体应变的变化,以及磁性能和SEM测试,研究了温度对热变形磁体性能和微观结构的影响,分析了热变形过程的热变形机理。结果表明,纳米晶磁体存在最佳的热压温度和热变形温度。当热压温度为550℃,热变形温度为850℃,磁体的剩磁和磁能积最大值,分别为1.343 T和344.7 kJ/m3。纳米晶Nd-Fe-B磁体的热变形过程塑变应力和温度的关系满足:lnσ∝1/T。更多还原

【Abstract】 Full dense anisotropic magnets are prepared from commercial MQ powders by hot-pressing and subsequent hot deformation with different temperature in order to study the hot-deformation mechanism of nanograin Nd-Fe-B magnets.Effect of temperature during hot-pressing and hot deformation process on magnetic properties and microstructure of Nd-Fe-B magnets is investigated by magnetic measurement and scanning electron microscopy(SEM).The mechanism of hot deformation is studied by analyzing the values of stresses and strains recorded during hot deformation process.The largest remanence(Br=1.343 T) and maximum energy product((BH)max=344.7 kJ/m3) are obtained with the hot-pressing temperature 550 ℃ and hot deformation temperature 850 ℃.In the hot deformation process the relationship of stresses and temperature satisfies this equation: lnσ∝1T更多还原