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空孔型欠陥のin situおよび二次元分布計測による金属水素脆化支配欠陥

空位型缺陷的原位二维分布测量研究金属中以氢脆为主的缺陷

基本信息

批准号：
21K04627
负责人：
Chiari Luca
金额：
$ 2.66万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-01 至 2024-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K04627/
关键词：
水素脆化空孔型欠陥金属その場測定陽電子

项目摘要

The main purpose of this research is to improve the positron annihilation spectroscopy technique, which is the only method for detecting atomic vacancies and to obtain confirmation of the defects thought to be responsible of the hydrogen embrittlement in common metals used in the hydrogen energy infrastructure, that is the vacancy-hydrogen complexes. An in-situ positron annihilation lifetime measurement method in a hydrogen environment, as well as in a hydrogen environment and under tensile stress, was developed and the existence of the vacancy-hydrogen complex, which becomes unstable by room temperature aging due to the hydrogen desorption after unloading, was proved in pure bcc-iron, which has a very large hydrogen diffusion coefficient.A Teflon electrolytic cell was devised for in-situ positron annihilation measurements under electrolytic hydrogen addition and stress loading. Positron lifetime measurements were carried out while charging charging the samples that were strained at fast or slow strain rate up to 25% in a hydrogen environment. The results for the sample strained at fast strain rate showed the formation of vacancy clusters irrespective of the measurements during in-situ hydrogen charge or in air, in accordance with previous studies. On the other hand, in the sample strained at slow strain rate the formation of vacancy-hydrogen complexes was detected during the hydrogen charge. Subsequently, these defects grew into increasingly larger vacancy clusters as a function of aging time in air due to the hydrogen desorption from the sample.

这项研究的主要目的是改进正电子湮没光谱技术，这是检测原子空位的唯一方法，并确认导致氢能基础设施中常见金属氢脆的缺陷，即空位-氢复合体。发展了一种氢环境、氢环境和拉应力下的正电子湮没寿命原位测量方法，并证明了在氢扩散系数很大的纯bcc-Fe中存在空位-氢复合体，这种空位-氢复合体在卸载后由于氢的脱附而在室温老化时变得不稳定。设计了一种聚四氟乙烯电解槽，用于正电子湮没的原位测量。正电子寿命测量是在充电时进行的，这些样品在氢环境中以快应变速率或慢应变速率应变，最高可达25%。与以前的研究一致，在快应变速率下应变的样品的结果表明，无论是在原位充氢过程中还是在空气中，无论测量结果如何，都会形成空位团。另一方面，在慢应变速率下应变的样品中，在充氢过程中检测到空位-氢复合体的形成。随后，由于样品中氢的脱附，随着空气中老化时间的延长，这些缺陷成长为越来越大的空位团。

项目成果

期刊论文数量（25）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy

通过正电子湮灭寿命光谱研究炭黑填充异戊二烯橡胶的自由体积

DOI：
10.1002/app.52857
发表时间：
2022
期刊：
Journal of Applied Polymer Science
影响因子：
3
作者：
Chiari Luca;Nippa Madoka;Ikeda Yuko;Sato Tomoyuki;Tsujimoto Yuji;Kato Atsushi;Chiba Naomichi;Fujinami Masanori
通讯作者：
Fujinami Masanori

Formation and time dynamics of hydrogen-induced vacancies in nickel

镍中氢致空位的形成和时间动态

DOI：
10.1016/j.actamat.2021.117264
发表时间：
2021
期刊：
Acta Mater.
影响因子：
0
作者：
L. Chiari;K. Kojima;Y. Endo;H. Teshigahara;M Butterling;M.O. Liedke;E. Hirschmann;A.G. Attallah;A. Wagner;M. Fujinami
通讯作者：
M. Fujinami

Analysis of the Chemical State in Y-zeolite Pores by Positron Annihilation Lifetime Spectroscopy

正电子湮没寿命谱分析 Y 沸石孔隙中的化学态