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采用冷加工和热处理方法制备多股铌—钛线,可以使铌—钛合金的晶粒细化,形成适当大小的亚晶粒,提高多股铌—钛线的高场临界电流密度Jc本文报导了用透射电镜对多股铌—钛线的纵,横截面中亚晶粒的形貌电子衍射和晶格象的观察结果,并讨论了亚晶粒尺寸与晶界对超导性能的影响。纵,横截面的电镜样品均用离子减薄方法制备。图1是多股铌—钛线纵截面的电子显微象。箭头所指的方向是多股铌—钛线的拉伸方向。图中显示出被拉长的晶粒形成的亚晶带。亚晶带的方向是平行干线的拉伸方向。亚带的宽度为300A—1000A。图2是多股铌—钛线横截面的电子显微象。图中显示出的晶粒也是加工后形成的亚晶
Preparation of multi-strand niobium-titanium wire by cold working and heat treatment can refine the grain of niobium-titanium alloy to form subgrains of appropriate size and increase the high field critical current density of multi-strand niobium-titanium wire. Jc The electron diffraction and lattice images of the subgrains in the longitudinal and cross sections of multi-strand niobium-titanium wires were observed by transmission electron microscopy. The effects of subgrain size and grain boundary on superconductivity were also discussed. Longitudinal and cross-sectional electron microscopy samples were prepared by ion-thinning method. Figure 1 is an electron micrograph of a multi-stranded niobium-titanium longitudinal section. The direction of the arrow is the direction in which multiple niobium-titanium wires are drawn. The figure shows subgrains formed by elongated grains. The direction of the sub-band is parallel to the direction of stretching. The width of the sub-band is 300A-1000A. Figure 2 is an electron micrograph of a multi-stranded niobium-titanium cross-section. The grains shown in the figure are also subgrains formed after processing