The effect of D2O on fatigue-crack propagation in a high-strength aluminum alloy

✍ Scribed by R. P. Wei; J. D. Landes

• Publisher: Springer Netherlands
• Year: 1969
• Tongue: English
• Weight: 178 KB
• Volume: 5
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00189941

✦ Synopsis

The rates of fatigue-crack propagatmn for a h~gh-strength aluminum alloy (7075-T651) in a~ envaronment of D20 (99 98~ purity) at room temperature were determined and compared with data obtained in [ugh-purity argon and dastflled water. The results showed that D20 caused a ten-fold Increase in the rate of fatigue-crack propagation (up to 10-* inch per cycle), which is equal to the increase caused by distilled water. These results lend further support to the previous observation that the rate controlling process for fatigue-crack propagation in this alloy (at rates below 10 .4 inch per cycle) is the mechanical process of creating new crack surfaces, instead of either the transport of aggressive environment to the crack-tip or d~ffusion of hydrogen ions into the material ahead of the crack tap.