Isothermal aging of Al-Ni-Sc alloy containing Al3Ni microfibers and Al3Sc nanoprecipitates

Chanun Suwanpreecha*, Jacques Perrin Toinin, Phromphong Pandee, David C. Dunand, Chaowalit Limmaneevichitr

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Binary Al-Sc alloys have excellent strength at room and elevated temperature up to 300°C due to coherent of Al3Sc nanoprecipitates. Binary Al-Ni alloys are an alternative alloy for high-temperature applications owing to high-thermal stability of Al3Ni microfibers. In this study, the hardness evolution at 300°C for up to 672 h for eutectic ternary Al-6Ni-0.4Sc (wt%) was studied and compared with binary Al-0.4Sc and Al-6Ni alloys. The Al-6Ni alloy maintains a constant hardness after aging at 300°C up to 672 h. Both Al-0.4Sc and Al-6Ni-0.4Sc alloys show strong precipitation strengthening response, with peak hardness reached after about 3 h aging, due to Al3Sc precipitates. These precipitates were studied in Al-6Ni-0.4Sc via local electrode atom probe tomography and contain small amounts of Ni (0.04 at%) which do not affect the kinetics of precipitation. The microhardness evolution for Al-6Ni-0.4Sc can be explained through superposition of binary Al-0.4Sc and Al-6Ni alloys, indicating that both Al3Sc nanoprecipitates and Al3Ni microfibers contribute to strength.

Original languageEnglish (US)
Pages (from-to)37-41
Number of pages5
JournalJournal of Metals, Materials and Minerals
Volume29
Issue number2
DOIs
StatePublished - 2019

Keywords

  • Al-Ni-Sc alloy
  • Atom probe tomography
  • Precipitation strengthening

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • General Materials Science
  • Biomaterials
  • Materials Science (miscellaneous)

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