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Mechanical milling (MM) of iron powder is one of the useful techniques to achieve ultra grain refining to nanosize. For instance, MM treatment using high energy ball-mill makes the grain refining to 20-30nm possible and such an ultra grain refining results in marked hardening of iron powder to around Hv 9.5GPa. On the annealing of the powder with MM treatment (MM powder), very fine oxide particles...
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