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题名: Revealing the Maximum Strength in Nanotwinned Copper
作者: L. Lu;  X. Chen;  X. Huang;  K. Lu
发表日期: 2009
摘要: The strength of polycrystalline materials increases with decreasing grain size. Below a critical size, smaller grains might lead to softening, as suggested by atomistic simulations. The strongest size should arise at a transition in deformation mechanism from lattice dislocation activities to grain boundary- related processes. We investigated the maximum strength of nanotwinned copper samples with different twin thicknesses. We found that the strength increases with decreasing twin thickness, reaching a maximum at 15 nanometers, followed by a softening at smaller values that is accompanied by enhanced strain hardening and tensile ductility. The strongest twin thickness originates from a transition in the yielding mechanism from the slip transfer across twin boundaries to the activity of preexisting easy dislocation sources.
KOS主题词: strain rate sensitivity;  Metals;  Mechanical properties;  Tensile properties;  Dislocations;  Bauschinger effect;  Copper
刊名: Science
相关网址: <Go to ISI>://WOS:000262862800035
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
L. Lu,X. Chen,X. Huang,et al. Revealing The Maximum Strength In Nanotwinned Copper[J]. Science,2009,323(5914):607-610.

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