Why is chromium more brittle than iron? I understand that both of them are BCC at room temperature. Is it to do with the grain size? Why is it different between the two metals?
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The brittleness is caused primarily by interstitial impurities. That's the case of chromium as well as all Group VI A metals. For chromium, the nitrogen atoms are the main impurities.
answered May 19, 2016 at 9:01