In-situ study on the effect of Li concentration on hydrogen microporosity evolution in Al-Li alloys by synchrotron X-ray radiography

被引：0
作者：
Li, Xingxing [1 ]
Wang, Junsheng [1 ,2 ]
Miao, Yisheng [1 ]
Li, Quan [1 ]
Xue, Chengpeng [1 ]
Yang, Xinghai [1 ]
机构：
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[2] Beijing Inst Technol, Adv Res Inst Multidisciplinary Sci, Beijing 100081, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 1008卷
基金：
中国国家自然科学基金;
关键词：
Al-Li alloys; Synchrotron radiation; Hydrogen microporosity; Evolutionary kinetics; X-ray computed tomography; FATIGUE BEHAVIOR; POROSITY; SOLIDIFICATION; MICROSTRUCTURE; SOLUBILITY; GAS; PERFORMANCE; TOMOGRAPHY; NUCLEATION; PREDICTION;
D O I：
10.1016/j.jallcom.2024.176810
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The nucleation and growth of hydrogen microporosity during the solidification of Al-Li alloys were in situ observed by synchrotron radiation X-ray radiography, and the effect of initial Li concentration on its evolution kinetics was investigated. The results show that the high Li concentration effectively contributes to the hightemperature nucleation effect of hydrogen microporosity during the solidification of Al-Li alloys, and significantly increases the nucleation and growth rates of hydrogen microporosity. When the initial Li concentration was 2.0 wt%, the nucleation supersaturation of hydrogen microporosity was 1.96, which was 3.5 times higher than that at low Li concentration (1.5 wt%), and the growth rate was up to 2.61 mu m/s. In addition, the quantitative results of the final size, morphology, and distribution of the hydrogen microporosity based on 3D X-ray computed tomography (X-CT) showed that high Li concentration not only increased the volume of monolithic hydrogen microporosity, and increased the total number of microporosities, but also increased the degree of irregularity of hydrogen microporosity. The in-situ observation results can provide a new dataset for the establishment and validation of the hydrogen microporosity model of Al-Li alloys.
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页数：13
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