Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation

doi:10.1016/j.jmst.2021.04.060

Abstract

Abstract:

The variations in the pop-in behavior of an equiatomic CoCrFeMnNi high-entropy alloy under different hydrogen charging/discharging conditions were characterized via in-situ electrochemical nanoindentation. Results show that hydrogen accumulatively reduces both pop-in load and width, among which the reduction of pop-in width is more noticeable than that of pop-in load. Moreover, the hydrogen reduction effect on both pop-in load and width is reversible when hydrogen is degassed during anodic discharging process. Particularly, the hydrogen-reduced pop-in width was studied in detail by a comprehensive energy balance model. It is quantitatively shown that the dissolved hydrogen enhances lattice friction, leading to an increased resistance to dislocation motion. As a result, fewer dislocations can be generated with a higher hydrogen concentration, causing a smaller pop-in width. This is the first time that the pop-in width indicated dislocation mobility under hydrogen impact is quantitively revealed.

Key words: Nanoindentation, Pop-in, Hydrogen, Dislocation, High-entropy alloy

Dong Wang, Xu Lu, Meichao Lin, Di Wan, Zhiming Li, Jianying He, Roy Johnsen. Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation[J]. J. Mater. Sci. Technol., 2022, 98: 118-122.

Figures/Tables 4

Fig. 1. Load-displacement curves in (a) air, under the hydrogen charging conditions at (b) H1 (-1300 mV), (c) H2 (-1400 mV), (d) H3 (-1500 mV), and (e) anodic hydrogen discharging condition. The surface quality before and after hydrogen charging are shown as the insets in (a) and (e), respectively. (f) shows the pop-in width Δh and pop-in load p under different hydrogen charging conditions.

Fig. 2. Relation between pop-in width and pop-in load under different hydrogen charging conditions. Dashed line shows an example of the major hydrogen effect on pop-in width.

Fig. 3. (a) Stored elastic energy for dislocation nucleation. (b) The schematic of prismatic dislocation loops beneath the indenter generated during pop-in. (c) Distribution of maximum shear stress beneath the indenter according to Hertz-Huber model. The plane defines 98% of the maximum shear stress.

Fig. 4. The cumulative frequency distribution of unit friction energy for dislocation motion at the instant of pop-in.

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