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三维原子尺度成像杂质分离到线路缺陷的三维原子尺度成像

Blavette¹, Cadel, Fraczkiewicz

¹Sonde Atomique et Microstructures, Groupe de Metallurgie Physique, UMR CNRS 6634, Faculte des Sciences de Rouen, Universite de Rouen, 76821 Mont-Saint-Aignan Cedex, France.

Science (New York, N.Y.)

|December 22, 1999

概括

研究人员直接拍摄了被称为Cottrell大气层的杂质原子云,这些云在铁合金中的脱位附近. 他们观察到,在离位线周围出现了显著的缩和耗,影响了合金的性能.

科学领域:

材料科学材料科学材料科学
物理金学物理金学
固态物理固态物理

背景情况:

污染原子云,或科特雷尔大气层,近线缺陷被认为影响合金塑料变形.
对这些大气层的直接可视化对于理解它们的影响至关重要.

研究的目的:

在有序的铁合金中围绕着位移的Cottrell大气层直接成像.
量化与这些大气相关的局部化学成分变化.

主要方法:

利用三维原子探头技术进行原子尺度成像.
在<001>晶体学方向沿着被的铁合金进行了研究.

主要成果:

成功拍摄了一个丰富的区域 (Cottrell大气层) 围绕着<001>边缘脱位.
观察到直径为5纳米的管状丰富,度增加了50倍 (至2个原子百分比).
检测到伴随着丰富的20个原子百分比的显著局部耗.

结论:

提供了铁合金中Cottrell大气形成的直接原子级证据.
证明了由位移引起的显著局部化学变化,包括丰富和耗尽.
这些发现为影响合金中的塑性变形的机制提供了洞察力.

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