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<p>The impact of dislocation density on hydrogen embrittlement in 5N pure aluminum is reported. Samples were annealed and then cold rolled to increase dislocation density. <i>In situ</i> humid air exposure during slow strain rate testing was used to charge samples to 25&#xa0;ppm hydrogen. No differences in elongation to failure or yield strength between ambient and high relative humidity exposed samples were noted, regardless of the degree of rolling condition. Fractography showed indications of ductile failure with no evidence of embrittlement. The low flow stress of pure aluminum coupled with hydrogen-dislocation interactions suppresses crack formation and enables the retention of plasticity.</p> Graphical abstract <p></p>

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Dislocation density effects on hydrogen embrittlement of 5N pure aluminum

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Adam Freund,
  • Joshua Edwards,
  • Micah Sweezey,
  • Suveen Mathaudhu

摘要

The impact of dislocation density on hydrogen embrittlement in 5N pure aluminum is reported. Samples were annealed and then cold rolled to increase dislocation density. In situ humid air exposure during slow strain rate testing was used to charge samples to 25 ppm hydrogen. No differences in elongation to failure or yield strength between ambient and high relative humidity exposed samples were noted, regardless of the degree of rolling condition. Fractography showed indications of ductile failure with no evidence of embrittlement. The low flow stress of pure aluminum coupled with hydrogen-dislocation interactions suppresses crack formation and enables the retention of plasticity.

Graphical abstract