Microstructure and Mechanical Properties of an Al-Mn-Si Alloy Microalloyed with Sn

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

*Corresponding author for this work

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

Abstract

We demonstrate that a small addition of a low-melting point element such as Sn (0.02 at.%), within the impurity tolerances of commercial aluminum alloys, to an Al-0.5Mn-0.3Si (at.%) model alloy, converts this non-heat-treatable (with negligible precipitation strengthening) alloy into a heat-treatable (precipitation strengthened) alloy with high strength, creep, and coarsening resistance. The small Sn additions refine significantly the α-Al(Mn,Fe)Si-precipitate distribution, which is related primarily to the formation of Sn-rich nanoprecipitates at intermediate temperatures (~200 °C). At higher temperatures, these nanoprecipitates act as heterogeneous nucleation sites for Mn-Si-rich nanoprecipitates—the quasi-crystalline precursors of the α-precipitate. We demonstrate that precipitation hardening by these Sn-modified α-precipitates is a highly efficient approach for designing creep-resistant aluminum alloys.

Original languageEnglish (US)
Title of host publicationLight Metals 2023
EditorsStephan Broek
PublisherSpringer Science and Business Media Deutschland GmbH
Pages528-534
Number of pages7
ISBN (Print)9783031225314
DOIs
StatePublished - 2023
EventLight Metals Symposium held at the TMS Annual Meeting and Exhibition, TMS 2023 - San Diego, United States
Duration: Mar 19 2023Mar 23 2023

Publication series

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

Conference

ConferenceLight Metals Symposium held at the TMS Annual Meeting and Exhibition, TMS 2023
Country/TerritoryUnited States
CitySan Diego
Period3/19/233/23/23

Keywords

  • Creep resistance
  • Heterogeneous nucleation
  • High-temperature aluminum alloys
  • Precipitation strengthening
  • Tin micro-alloying

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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