排序方式: 共有104条查询结果,搜索用时 31 毫秒
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隆起度(γ)在Fe-Mn-Ti合金中随热处理条件而变化,在510℃回火,r值阴时间缓慢上升,但数值一直保持在0.4到0.5之间,在570℃回火,在50min,r达极大值0.51,然后随时间延长略有下降,在各温度回火90min,观察性能的变化,看到(BH)max和(BrHc)在480℃达极大值,r在较低温度,440℃达极大值,从历史角度看人们对隆起度数值的重视程度有明显变化,在国外1970年后的磁性材料书籍中基本不再提及隆起度,而在国内最近还有使用和论述的,其可能原因是对永磁体材料和永磁学的发展认识不同。 相似文献
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A series of YTi(Fe_(1-x)_(11)alloy withx=0.00,0.01,0.03,0.04,0.05,0.07 and 0.10 hasbeen investigated by measurement of the structuralproperties and ~(57)Fe Mssbauer experiments.Thepure ThMn_(12)-structure phase exists at x≤0.03 andis absent at x>0.03.The reasons for lower satura-tion magnetization and lower energy product of theThMn_(12)-structure compounds were given.Thecrystal structure relations 相似文献
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Small discs of type HR- 1 austenitic steel (OCr17Ni14MnMo) have been irradiated with 30-170 keV He+ for doses 1015- 1×1018/cm2 at 300K. 2.5 MeV enhanced proton backscattering, TEM, SEM and CEMS are used to investigate the He trapping, bubble structures and the phase stability. It is found that a maximum He concentration of -28 at. % was obtained after implantation with 70 keV He+ at a dose just below critical. The micro- Vickers hardnesses of irradiated layers decrease with increasing dose, particularly when dense bubbles formed. The isomer shift of CEMS increases in the negative direction after irradiation. The austenite is believed to be stable against radiation induced martensitic transformation. 相似文献
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关于Fe—Mn—Si合金在TN以下马氏体转变问题的讨论 总被引:2,自引:0,他引:2
在Fe-Mn-Si类型形状记忆合金中,奥氏体在高温是顺磁性的,温度降低到奈耳点TN以下就转变为反铁磁性的。本文从理论和实验上说明,反铁磁状态的奥氏体仍有可能转变为六方晶格的马氏体。 相似文献
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应用穆斯堡尔谱学方法半定量测定了Fe-Cr-Co-Mo永磁合金在最佳磁性状态两相的成分及相对量。Fe-23Cr-15Co-2Mo-0.5Ti柱晶合金和Fe-30Cr-25Co-3Mo-1Ni-0.5Zr等轴晶合金的a_1相分别为78Fe-18Co-4Cr和60Fe-37Co-3Cr。a_2相分别为12Fe-3Co-85Cr和9Fe-3Co-88Cr,a_1相的相对量分别为0.72和0.62。结合透射电子显微镜,磁转矩仪和冲击磁测仪测定了合金中强磁性相粒子的尺寸,单轴各向异性常数和合金矫顽力等磁性能参数。按单畴粒子理论计算了合金的矫顽力,所得结果与实测值符合较好,从而认为Fe-Cr-Co-Mo合金的高矫顽力来自于单畴粒子的磁矩转动。 相似文献
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