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优化样品准备用于合金的现场TEM加热研究

Longhui Chen¹, Chunhui Liu², Jianshi Yang²

¹Light Alloy Research Institute of Central South University, State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Changsha 410083, China.

Micron (Oxford, England : 1993)

|July 24, 2025

概括

这项研究揭示了样品制备如何影响-铜-合金中的T1相沉. 优化样品厚度和使用先进的传输技术,尽量减少污染,以准确地在现场进行TEM观测.

科学领域:

材料科学材料科学材料科学
金工业是金工业的一个方面.
纳米技术纳米技术

背景情况:

-铜- (Al-Cu-Li) 合金是重要的航空航天材料.
机械性能取决于老化过程中的T1阶段沉动态.
在现场传输电子显微镜 (TEM) 对于观察这些动态至关重要.

研究的目的:

为现场TEM开发一个改进的样品准备和转移协议.
为了研究 (Ga) 和 (Pt) 污染对T1降水的影响.
为了确定最佳的样品厚度,观察Al-Cu-Li合金中的T1阶段演变.

主要方法:

在现场TEM与微电子机械系统 (MEMS) 加热芯片相结合.
高角环状暗场扫描TEM (HAADF-STEM) 和能量分散式X射线光谱 (EDS).
评估样品的准备,转移技术和厚度 (80-300 nm).

主要成果:

分离扭曲了内在的T1沉,以粒体内粒子和粒度边界丰富的形式出现.
外部传输和低能离子削 (3kV) 有效地抑制了Ga/Pt污染.
样品厚度显著影响降水动力学和成像分辨率;150-200nm是最佳的.

结论:

通过优化准备来最大限度地减少Ga/Pt污染对于准确的T1沉研究至关重要.
样品厚度是一个关键参数,影响降水行为和TEM成像质量.
该研究提供了一种精细的方法,用于对Al-Cu-Li合金进行现场TEM分析.

关键词:

合金是一种合金.聚焦的离子束.在现场进行TEM.降水量降水量降水量样品的准备样品的准备

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