Nanoscale phase transition in impact indented Mo/Cu thin films

Sahu, Bibhu Prasad; Walker, C. C.; Pharr, G. M.; Misra, Amit

doi:10.1016/j.scriptamat.2023.115846

Nanoscale phase transition in impact indented Mo/Cu thin films

Journal Article · Thu Oct 26 00:00:00 EDT 2023 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2023.115846· OSTI ID:2448080

^[1]; ^[2]; ^[2]; Misra, Amit ^[3]

University of Michigan, Ann Arbor, MI (United States); University of Michigan
Texas A&M University, College Station, TX (United States)
University of Michigan, Ann Arbor, MI (United States)

The study reveals a size effect in deformation mechanisms via unique structural transitions in sputter deposited fcc/bcc nanolayers under high strain rate impact nanoindentation as layer thickness is reduced from around 100-200 nm to around 5 nm. Here, the indented 5 nm Cu/5 nm Mo multilayer films characterized via cross-sectional scanning/transmission electron microscopy have revealed a phase transition in the 5 nm thick Mo layers from BCC to a coherent metastable FCC structure and fine deformation twins in the 5 nm Cu layers inside a shear band that is approximately 500 nm long and inclined to the layer interfaces. In contrast, thicker layers, 80 nm Cu/180 nm Mo, show different deformation behavior with uneven layer thickness reduction, shearing of Cu layers, and bending of the columnar Mo grains beneath the indentation without any sign of shear band and localized phase transformation.

View Accepted Manuscript (DOE)

Research Organization:: Texas A&M University, College Station, TX (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003857

OSTI ID:: 2448080

Alternate ID(s):: OSTI ID: 2203966

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 240; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Deformation induced Phase transformation
Effect of layer thickness
High strain rate impact indentation
Multilayer Cu/Mo film
shear band

Nanoscale phase transition in impact indented Mo/Cu thin films

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