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However, for many pure metals such a %EL is still nowhere close to their characteristic high ductility in cg form (d of many micrometers and above).
More importantly, the useful uniform tensile deformation, i.e., the plastic strain before localized deformation sets in at or near the peak in the engineering stress¨Cstrain curve, is close to zero for almost all nc and ufg metals¡££¨×¢£º£¥ELÊÇ É쳤ÂÊ £¬  cgÊÇcoarse-grained (cg)  £¬d±íʾ¾§Á£³ß´ç£¬  ncÊÇÄÉÃ×£¬ufgÊdz¬Ï¸¾§ £©

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