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倾卿笑语如存

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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–strain curve, is close to zero for almost all nc and ufg metals。(注:%EL是 伸长率 ,  cg是coarse-grained (cg)  ,d表示晶粒尺寸,  nc是纳米,ufg是超细晶 )
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倾卿笑语如存: 金币+30, 翻译EPI+1, ★★★★★最佳答案 2015-09-23 14:21:10
然而,对于许多纯金属,这样一种伸长率仍然无法和其粗晶形式(许多晶粒尺寸达微米及微米以上)所特有的高延展性相提并论。更重要的是,有用的均匀拉伸变形,即发生于各种局部变形之前的塑性应变,在工程应力 - 应变曲线的峰值或峰值附近,对几乎所有纳米和超细晶金属接近于0。
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