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xkcd bot@lemmy.worldB to xkcd@lemmy.worldEnglish · 3 days ago

xkcd #3115: Unsolved Physics Problems

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xkcd #3115: Unsolved Physics Problems

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xkcd bot@lemmy.worldB to xkcd@lemmy.worldEnglish · 3 days ago
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xkcd #3115: Unsolved Physics Problems

Title text:

‘Tin pest’ makes more sense to me. Tin just doesn’t want to be locked down in a shape like that. I get it. But why would any metal want to grow hair??

Transcript:

Transcript will show once it’s been added to explainxkcd.com

Source: https://xkcd.com/3115/

explainxkcd for #3115

  • BartyDeCanter@lemmy.sdf.org
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    3 days ago

    And does he know why? I’ve had to deal with it too often and it would be really nice to be able to expand RoHS to aerospace.

    • Successful_Try543@feddit.org
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      3 days ago

      Deep in the coating, where the Cu6Sn5 [Remark: intermetallic phase of Sn coating and Cu substrate] is present, the deviatoric strain was high. This indicates that the growth of the intermetallic phase causes plastic deformation of the tin coating.
      […]
      A short (4 micrometre) radial gradient in hydrostatic stress was observed around the root of the whisker. This gradient together with long-range diffusion from specific regions could provide the driving force for whisker growth.

      https://portal.research.lu.se/en/publications/tin-whiskers-experiments-and-modelling

      • Lemminary@lemmy.world
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        2 days ago

        Oh, but of course! The deviatoric strain, yes.

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