• Silicon part is greater than 50%

  • Has plasticity comparable to iron.

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    $\begingroup$ Could you elaborate a little more? Mentioning why you want such an alloy may help a potential answerer. Also, even though metallurgy isn't my area of expertise...if an alloy with a 50%+ silicon content isn't brittle, then I don't know what it is ;) $\endgroup$ – paracetamol May 26 '17 at 9:54
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    $\begingroup$ Yes, please elaborate on the use case. There are many silicides with >50 at.% Si, and I'm not going to sift through them all looking for mechanical property info... $\endgroup$ – Jon Custer May 26 '17 at 13:02

The only alloys I can think of where silicon would be present in that high a quantity would be ferrosilicon, silumin (where you very rarely get 50% Si), and things like silicon-germanium which are usually used as semiconductors for very small scale applications. Otherwise, you're looking at ceramics like silicon carbide.

All of those materials tend to be very brittle on a macro scale: on a nano scale, some ceramics show ductility. I'd be very surprised if you can find anything that matches your criteria though.

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