Study on Fatigue Slip Bands and Nucleation of Microcracks by Using Scanning Tunneling Microscope

扫描隧道显微镜研究疲劳滑移带和微裂纹形核

• 批准号: 02452093
• 负责人: ISHII Hitoshi
• 金额: $ 0.32万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452093/
• 关键词: Scanning Tunneling Microscope; Fatigue Slip Band; Microcrack; Gold; Silver; Copper; 走差トンネル顕微鏡; マイクロクラックの発生

A Scanning Tunneling Microscope (STM) with a maximum scanning area of 7.1mum X 7.4mum and a maximum height resolution of 0.1 nm was built in our laboratory, and fatigue slip bands of cyclically strain deformed high purity Au, Ag or Cu were observed with this STM. The observed thin plate specimens were cyclically deformed in air at a constant strain range of 1500 or 2000 muepsilon for 3000 or 5000 cycles by using the specially built 4 points cyclic bending machine.From the STH images of fatigued Au, slip bands were divided into two types. That is, the coarse slip bands with the height of 50-200 nm and the spacing of 500-2000 nm and the fine ones with the height of 50-80 nm and the spacing of 50-300 nm were observed. Furthermore, there existed a tendency that the spacing as well as the height of the coarse slip bands decreased as the number of cycles increased, while no effect was observed in the fine slip bands. The coarse slip bands could be regarded as. the aggregation of the fine slip bands. Another point of interest was that semicircular extrusion like patterns were observed along the silp lines. The STM images of the slip bands deformed by static bending revealed that their heights and spacings were 20-30 nm and 150-500 nm, respectively, and which were distributed more uniformly compared to the fatigued Au specimens' slip bands. In the case of fatigued Ag, variation in the heights was a little less compared to the Ag and their heights and spacings were 15-30 nm and 200-400 nm. Unfortunately we could not observe the STM images of Cu. This is regarded that we could not find the adequate condition for STM observations because of the formation of oxide layer. Based on the above mentioned results, discussions were made to get further achievement.

本实验室搭建了一台最大扫描面积为7.1mum X 7.4mum、最大高度分辨率为0.1 nm的扫描隧道显微镜（STM），利用该STM对循环应变变形的高纯Au、Ag或Cu的疲劳滑移带进行了观察。使用特制的4点循环弯曲机，将观察到的薄板样品在空气中以1500或2000 muepsilon的恒定应变范围循环变形3000或5000次。从疲劳Au的STH图像来看，滑移带分为两种类型。即观察到高度为50-200 nm、间距为500-2000 nm的粗滑带和高度为50-80 nm、间距为50-300 nm的细滑带。此外，随着循环次数的增加，粗滑带的间距和高度存在减小的趋势，而细滑带中没有观察到影响。粗滑带可视为。细滑带的聚集。另一个有趣的地方是沿着滑线观察到半圆形挤压状图案。静态弯曲变形滑移带的 STM 图像显示，它们的高度和间距分别为 20-30 nm 和 150-500 nm，并且与疲劳金样品的滑移带相比分布更均匀。在疲劳Ag的情况下，与Ag相比，高度的变化稍小，并且它们的高度和间距为15-30nm和200-400nm。不幸的是我们无法观察Cu的STM图像。这被认为是由于氧化层的形成，我们无法找到足够的STM观测条件。基于上述结果，进行了讨论，以期取得进一步的成果。

项目成果

石井 仁: "走査型トンネル顕微鏡による疲労すべり帯の観察" 日本機械学会材料力学講演会発表予定(1992ー9).

Hitoshi Ishii：“使用扫描隧道显微镜观察疲劳滑移带”预定在日本机械工程师学会材料力学讲座上发表（1992 年 9 月）。

石井 仁: "純金属における疲労すべり帯の発生およびそのフラクタル特性" 日本機械学会材料力学講演会論文集. 910ー71. 110-112 (1991)

Hitoshi Ishii：“纯金属中疲劳滑移带的出现及其分形特征”日本机械工程师学会材料力学会议记录 910-71（1991）。

石井 仁: "走査型トンネル顕微鏡による疲労すべり帯の観察" 日本機械学会材料力学講演会(1992ー9).

Hitoshi Ishii：“使用扫描隧道显微镜观察疲劳滑移带”日本机械工程师学会材料力学讲座（1992-9）。

H.Ishii: "Fatigue Behavior of SiC/Al Composite Materials" Proc.6th International Conference on Mechanical Behavior of Materials (ICM 6),Kyoto. (1991)

H.Ishii：“SiC/Al 复合材料的疲劳行为”Proc.6th 国际材料机械行为会议 (ICM 6)，京都。

Hitoshi ISHII, Shin MIYAZU and Keiichiro TOHGO: "Nucleation and Fractal Characteristics of Fatigue Slip Bands in Some Pure metals" Japan Society for Mechanical Engineers, Conference on Materials and Mechanics. No. 910-71, A. 110-112 (1991)

Hitoshi ISHII、Shin MIYAZU 和 Keiichiro TOHGO：“某些纯金属中疲劳滑移带的成核和分形特征”日本机械工程师学会材料与力学会议。