《Table 3.Fraction of cube texture (<10°) for recrystallized Cu Ni substrates at different tempera

《Table 3.Fraction of cube texture (<10°) for recrystallized Cu Ni substrates at different tempera   提示:宽带有限、当前游客访问压缩模式
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《Effect of different deformation and annealing procedures on non-magnetic textured Cu_(60)Ni_(40) alloy substrates》


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After one-step annealing,the 99%deformed tape(5%deformation per pass)was investigated using EBSD to characterize the sub-orientation in samples recrystallized under different conditions.The cube orientation contents(Table 2)for samples A and B were 96.1%and 98%,respectively,whereas the amounts of low-angle grain boundaries(2°–10°)were 75%and 86%,respectively.Fig.3 shows the EBSD maps of Cu60Ni40 substrates after 30 min of annealing at 1000°C(sample A)or 1050°C(sample B).After annealing,twins were generated in both samples.These alloys have high contents of cube-oriented grains;however,their proportions of low-angle grain boundaries are slightly low.These low proportions of low-angle grain boundaries are attributed to the cube orientation(≤10°)deviating from the ideal cube texture after annealing,thus resulting in a relative misorientation between adjacent cube-oriented grains and in the generation of some twins(see Fig.3).Other authors have reported[26–27]that annealing twins and large-angle grain boundaries present in the substrate strongly affect the superconducting critical current density(Jc)of YBCO thin films.To achieve a higher Jc,the non-cube-oriented grains and annealing twins must be avoided,thus increasing the content of low-angle grain boundaries and cube orientation.The content of twin boundaries can be decreased by increasing the annealing temperature(see Fig.3,which shows that sample B has a lower number of twin boundaries than sample A).However,several huge grains are observed in sample B,in agreement with the results of Sarma et al.[28],who stated that increasing the temperature or prolonging the annealing time too much will lead to abnormal grain growth and to secondary recrystallization at the expense of the generation of cube-oriented grains.