Abstract
This paper reviews two investigations of the effects of impurities on the properties of metals. In the first example, the results show that room temperature ductility can be achieved in polycrystalline chromium if the impurity level is sufficiently low. The results clearly show that increased carbon can destroy this ductility. The second study shows that high purity titanium is much more resistant to hydrogen embrittlement than material with a lower purity level. It is proposed that this difference occurs because the higher interstitial level causes a decrease in the solubility of hydrogen. Therefore, hydrides, which cause embrittlement in titanium, form more easily in the impure material.
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