Abstract
A comparative study of the hydrogen effect on overall ductility in the rolling direction of aluminium alloy 2024 in the T351 temper condition and aluminium alloy 2024 aged at 190°C for 7 h has been conducted. Hydrogen-pre-charged and hydrogen-free sheet tensile specimens have been tested at either a constant or an alternating strain rate. It has been found that internal hydrogen caused severe degradation in overall plastic elongation of aluminium alloy 2024-T351 and that in artificially aged alloy 2024 the embrittlement was observed only after the onset of necking. It has been observed that hydrogen-induced modification of the strain rate dependence of flow stress by reducing dynamic hardening in alloy 2024-T351 aged at 190°C for 7 h and enhancing dynamic softening in alloy 2024-T351. It is suggested that hydrogen embrittlement is caused by hydrogen-induced enhancement of plastic deformation localization that mainly affects non-uniform plastic deformation.
| Original language | English |
|---|---|
| Pages (from-to) | 21-30 |
| Number of pages | 10 |
| Journal | Materials Science and Engineering: A |
| Volume | 125 |
| Issue number | 1 |
| DOIs | |
| State | Published - May 1990 |