Microstructure and Mechanical Properties of a Precipitation-Hardened Al–Mn–Zr–Er Alloy

Amir R. Farkoosh*, David N. Seidman, David C. Dunand

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Commercial aluminum alloys are unusable above ~250 °C (523 K, which is 56% of the absolute melting point of aluminum, Tm = 933 K), due mainly to the rapid coarsening/dissolution of their fine strengthening precipitates. The recently developed L12-strengthened alloys exhibit, however, a significantly better coarsening resistance at high temperatures. In this study, we present a new class of L12-strengthed aluminum alloys based on the Al–Mn–Zr–Er system, which exhibits an exceptional combination of high-creep and high coarsening resistance at 300 °C. The microstructure of the isochronally peak-aged alloys has been studied over relevant length scales utilizing scanning electron microscopy (SEM) and local-electrode atom-probe (LEAP) tomography, in parallel with microhardness measurements. Compressive creep experiments are performed to determine the creep threshold stresses of these alloys at 300 °C.

Original languageEnglish (US)
Title of host publicationLight Metals 2021 - 50th Anniversary Edition
EditorsLinus Perander
PublisherSpringer Science and Business Media Deutschland GmbH
Pages239-244
Number of pages6
ISBN (Print)9783030653958
DOIs
StatePublished - 2021
EventLight Metals Symposium held at the TMS Annual Meeting and Exhibition, 2021 - Pittsburgh, United States
Duration: Mar 15 2021Mar 18 2021

Publication series

NameMinerals, Metals and Materials Series
Volume6
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceLight Metals Symposium held at the TMS Annual Meeting and Exhibition, 2021
Country/TerritoryUnited States
CityPittsburgh
Period3/15/213/18/21

Keywords

  • Aluminum alloys
  • Coarsening kinetics
  • Creep resistance
  • High-temperature alloys
  • L1 nanoprecipitates
  • Mechanical properties
  • Scandium
  • Solid-solution strengthening
  • Zirconium

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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