Effect of temperature on the nano/microstructure and mechanical behavior of nanotwinned Ag films

Zhang, Huan; Geng, Jie; Ott, Ryan T.; Besser, Matthew F.; Kramer, Matthew J.

doi:10.1007/s11661-015-3028-8

Title: Effect of temperature on the nano/microstructure and mechanical behavior of nanotwinned Ag films

Journal Article · Wed Jun 24 00:00:00 EDT 2015 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-015-3028-8· OSTI ID:1221924

Zhang, Huan ^[1]; Geng, Jie ^[1]; Ott, Ryan T. ^[1]; Besser, Matthew F. ^[1]; Kramer, Matthew J. ^[1]

Ames Lab., Ames, IA (United States)

In situ and ex situ annealed nanotwinned (NT) Ag thin films have been investigated by TEM and tensile testing to reveal the thermal stability of the twin boundaries, grain boundaries, dislocation densities, and their respective influence of the macroscopic yield stress. The NT Ag films synthesized by magnetron sputtering form both coherent (CTB, Σ3{111}) and incoherent (ITB, Σ3{112}) twin boundaries that are thermally stable up to 473 K (200 Celsius), i.e., no obvious changes in grain size, twin spacing, and yield stress. In situ TEM observations show the dislocations become mobile at 453 K (180 Celsius) resulting in dislocation annihilation primarily at twin and grain boundaries. Rotation of grains with low-angle grain boundaries was observed during in situ heating, resulting in the growth of columnar grains above 453 K (180 Celsius). However, no noticeable changes in the spacings of CTBs were observed during the entire in situ and ex situ annealing [up to 873 K (600 Celsius)]. The increase in grain size and concomitant decrease in yield stress following annealing at various temperatures can be described by the Hall-Petch relationship, demonstrating that grain size rather than twin spacing is most sensitive to thermal annealing and plays a dominant role in the deformation of NT Ag films.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1221924

Report Number(s):: IS-J-8766; PII: 3028

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 46, Issue 9; ISSN 1073-5623

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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