Grain growth of nanocrystalline aluminum under tensile deformation: A combined in situ TEM and atomistic study

Stangebye, Sandra; Zhang, Yin; Gupta, Saurabh; Hosseinian, Ehsan; Yu, Frank; Barr, Christopher; Hattar, Khalid; Pierron, Olivier; Zhu, Ting; Kacher, Josh

doi:10.1016/j.mtla.2021.101068

Grain growth of nanocrystalline aluminum under tensile deformation: A combined in situ TEM and atomistic study

Journal Article · Sat May 01 00:00:00 EDT 2021 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2021.101068· OSTI ID:1781569

Stangebye, Sandra ^[1]; ^[2]; ^[2]; Hosseinian, Ehsan ^[2]; ^[1]; Barr, Christopher ^[3]; Hattar, Khalid ^[3]; Pierron, Olivier ^[2]; Zhu, Ting ^[2]; Kacher, Josh ^[1]

Georgia Institute of Technology, Atlanta, GA (United States). School of Materials Science and Engineering
Georgia Institute of Technology, Atlanta, GA (United States). Woodruff School of Mechanical Engineering
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Nanocrystalline Al thin films have been strained in situ in a transmission electron microscope using two separate nanomechanical techniques involving a push-to-pull device and a microelectromechanical system (MEMS) device. Deformation-induced grain growth was observed to occur via stress-assisted grain boundary migration with extensive grain growth occurring in the necked region, indicating that the increase in local stress drives the boundary migration. Under applied tensile stresses close to the ultimate tensile strength of 450 MPa for a nanocrystalline Al specimen, measured boundary migration speeds are 0.2 – 0.7 nm s^-1 for grains outside necked region and increases to 2.5 nm s^-1 for grains within the necked region where the local estimated tensile stresses are elevated to around 630 MPa. By tracking grain boundary motion over time, molecular dynamics simulations showed qualitative agreement in terms of pronounced grain boundary migration with the experimental observations. The combined in situ observation and molecular dynamics simulation results underscore the important role of stress-driven grain growth in plastically deforming nanocrystalline metals, leading to intergranular fracture through predominant grain boundary sliding in regions with large localized deformation.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1781569

Alternate ID(s):: OSTI ID: 1784779

Report Number(s):: SAND--2021-4967J; 695720

Journal Information:: Materialia, Journal Name: Materialia Vol. 16; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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