问题：第一张照片：1) Please point out in Fig 4(b) where are dislocations? How to confirm the contrast shown in Fig 4(b) is not due to serious contamination during TEM foil preparation? 这个问题俺真的不知道如何区别位错还是污染物！请各位帮助 第二张照片：2) Please explain in Fig 4(f), are the contrast highlighted by arrow in 4(f) caused by dislocation or beta grain boundary? 这个我认为是再结晶晶粒已经在原先的形变组织中形成，黑白衬度不同，是因为形成了位向各不相的 beta grain 。
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