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Thermal stability of highly nanotwinned copper: The role of grain boundaries and texture

  • Yifu Zhao (a1), Timothy Allen Furnish (a1), Michael Ernest Kassner (a1) and Andrea Maria Hodge (a1)

To study the effect of nanotwins on thermal stability, a comprehensive characterization study was performed on two types of ultrafine grained (UFG) copper samples, with and without nanotwins. The two samples were sequentially heat-treated at elevated temperatures, and the grain size, grain boundary character, and texture were characterized after each heat treatment. The as-prepared nanotwinned (nt) copper foil had an average columnar grain size of ∼700 nm with a high density of coherent twin boundaries (CTBs) (twin thickness, ∼40 nm), which remained stable up to 300 °C. In contrast, the other UFG sample had few CTBs, and rapid grain growth was observed at 200 °C. The thermal stability of nt copper is discussed with respect to the presence of the low energy nanotwins, triple junctions between the twins and columnar grains, texture and grain growth.

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Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
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