Requirements:
Silicon part is greater than 50%
Has plasticity comparable to iron.
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closed as too broad by Oscar Lanzi, paracetamol, Buttonwood, pentavalentcarbon, Jon Custer May 26 '17 at 13:05
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
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3$\begingroup$ 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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2$\begingroup$ 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
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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.
