If I was to add a filler to a metallic substance, is it possible for the Young's modulus to decrease as filler content increases?

Also, when a filler is added, how do the atoms change for improving strength please? Do they just prevent motion?

  • $\begingroup$ sure, if the filler is bonded to the item, and if the filler has a different modulus. I have no idea what you mean about atoms. $\endgroup$ – Tiger Guy Apr 6 at 19:27
  • $\begingroup$ Hi, thanks. For the atoms, what happens at an atomic level when filler material is added to a sample please? $\endgroup$ – Emmanuelle Apr 6 at 19:33
  • 1
    $\begingroup$ nothing happens, this is a macro-level process. Each material will behave as itself. $\endgroup$ – Tiger Guy Apr 6 at 19:36
  • $\begingroup$ Sure, for example with AlSiC metal matrix composite (ie not a proper alloy), by varying the ratio of aluminum to silicon carbide, you can tune the modulus over a meaningful range. (alternatively the thermal expansion is often the parameter being tuned). Technically SiC is a non metal and it increases modulus but hopefully close enough conceptually. $\endgroup$ – Pete W Apr 6 at 19:47

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