cqvip:Materials scientists have been constantly on the lookout for materials that simultaneously exhibit high strength and good ductility,which is contrary to common wisdom[1].Earlier attempts to achieve this unusual combination have met with limited success[2].Novel approaches such as a duplex microstructure consisting of nanocrystalline and ultrafine grains yielded encouraging results[3].While the nanocrystalline structure provided high strength,the ultrafine-grained(or relatively coarse-grained)structure provided the needed ductility.
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