离子微探针研究氢在材料中行为的新进展

本文阐述了我们近年来利用离子微探针对氢在材料中的基本行为研究取得的若干新进展:(1) 在裂纹尖端氢分布研究方面有突破性进展,首次实验发现在受载裂纹尖端存在着氢富集的双峰,对氢双峰的变化规律和形成原因进行了系统研究,并提出了相应的模型;(2) 实验确证了氢在六角密堆结构(hcp)和高位错密度(10~(12)/cm~2)材料塑性形变过程中的可动位错输运行为,并揭示了氢在位错芯部的“隧道扩散效应”;(3) 定量测定了工程厚度材料微区氢浓度分布,通过Fourier变换和Laplace变换,建立了新的微区氢扩散方程解析式,具有重要的实用价值。

New Progress in the Study of Hydrogen Behaviour in Materials by Ion Microprobe

The new progress of our Ion Microprobe study on the hydrogen behaviour in materials are presented in this paper. It is first in time experimentally discovered that there are existed two hydrogen accumulation peaks in front of loaded crack tips, and the formation mechanism and model of the duplex-peak of hydrogen accumulation are detailly studied and proposed. Experimental results confirmed that the mobile dislocations in hcp structure and high dislocation density materials also play an important role in hydrogen migratory during plastic deformation, and the Tunnel Diffusion Effect of hydrogen in dislocation cores is also proved. The hydrogen concentrations in micro-zone of the engineering thick materials are quantitatively measured, and the novel hydrogen diffusion equations, which are of great importance to engineering applications, are established through Fourier and Laplace transformation.