Grain growth and second-phase precipitation in nanocrystalline aluminum–manganese electrodeposits
Name
10853_2017_1764_ReferencePDF.pdf
Size
945.13 KB
Format
Adobe PDF
Checksum (MD5)
37a6201214063a8b736f2058988b8840
Author(s)
Huang, Ting Yun Sasha
Kalidindi, Arvind Rama
Schuh, Christopher A
Date Issued
November 2017
Journal
Journal of Materials Science
Publisher
Springer US
Citation
Huang, Ting-Yun, Arvind R. Kalidindi, and Christopher A. Schuh. “Grain Growth and Second-Phase Precipitation in Nanocrystalline Aluminum–manganese Electrodeposits.” Journal of Materials Science 53, no. 5 (November 2, 2017): 3709–3719.
Version
Author's final manuscript
Abstract
The structural stability of nanocrystalline aluminum–manganese (Al-6.5 at.% Mn) alloys is studied in the temperature range of 200–400 °C. Transmission electron microscopy shows that grain growth in this alloy is subdued by the presence of Mn, such that 100 nm or finer grain sizes can be retained at 200 and 300 °C even after 1 month of annealing. In contrast, the principal mode of instability in the alloy is the precipitation of the equilibrium Al6Mn phase, which was observed to form at much shorter timescales and is present at 300 and 400 °C after just 30 min. Differential scanning calorimetry was used to study the kinetics of the Al6Mn reaction using Johnson–Mehl–Avrami–Kolmogorov analysis and construct a time–temperature–transformation (TTT) diagram for this process. It is found that this Al–Mn single-phase nanostructured alloy can be stable against forming the Al6Mn phase and against grain growth for several months below 200 °C and for short thermal excursions up to 300 °C.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/s10853-017-1764-4
