传输基库奇衍射映射诱导原子探测器样本中的结构损伤
Baptiste Gault1,2, Heena Khanchandani1, Thoudden Sukumar Prithiv1
1Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf 40237, Germany.
概括
传输基库奇衍射 (TKD) 可以损坏原子探头断层扫描 (APT) 标本. 这项研究表明,TKD映射导致溶液再分配和空隙形成,在材料分析中产生了文物.
科学领域:
- 材料科学 材料科学 材料科学
- 分析化学 分析化学
- 电子显微镜电子显微镜
背景情况:
- 原子探头断层扫描 (APT) 对于分析纳米级材料化学是至关重要的.
- 传输基库契衍射 (TKD) 有助于定位样本用于APT分析.
- 由于TKD电子束造成的潜在结构损伤尚未得到充分了解.
研究的目的:
- 为了调查和证实由TKD映射引起的APT标本中的结构损伤.
- 确定损坏的性质及其对溶液分布的影响.
- 为TKD诱导的标本损伤提出一种机制.
主要方法:
- 分析了两个案例研究:β-Ti-12Mo合金和高钢.
- 使用传输基库奇衍射 (TKD) 来定位标本.
- 采用原子探头断层扫描 (APT) 来分析TKD后的样本化学和结构.
主要成果:
- TKD映射诱导了Ti-12Mo合金中的的平面分离.
- 在高钢中,TKD导致平面分离和充满的空隙 (泡).
- 在这两种情况下,由于TKD诱导的损伤,溶液分布中都出现了人工物.
结论:
- 通过改变溶液分布,TKD映射可以在APT分析中引入显著的文物.
- 一种拟议的机制涉及能量电子对表面物种 (H,C) 进行反弹植入,从而造成破坏级联.
- 需要仔细考虑TKD参数,以减轻样本损伤,以获得准确的APT结果.
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