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傾卿笑語(yǔ)如存木蟲(chóng) (小有名氣)
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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 伸長(zhǎng)率 , cg是coarse-grained (cg) ,d表示晶粒尺寸, nc是納米,ufg是超細(xì)晶 ) |

至尊木蟲(chóng) (知名作家)
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| 然而,對(duì)于許多純金屬,這樣一種伸長(zhǎng)率仍然無(wú)法和其粗晶形式(許多晶粒尺寸達(dá)微米及微米以上)所特有的高延展性相提并論。更重要的是,有用的均勻拉伸變形,即發(fā)生于各種局部變形之前的塑性應(yīng)變,在工程應(yīng)力 - 應(yīng)變曲線的峰值或峰值附近,對(duì)幾乎所有納米和超細(xì)晶金屬接近于0。 |
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