Ultrastrong and ductile metastable Fe-rich medium-entropy alloy with high-density nanolamellar L12 precipitates

Shidong Wang, Jinhua Wang, Yue Sun, Zhigang Yang, Gang Sha, Zengbao Jiao, Hao Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

An Fe-rich medium entropy alloy (MEA) with a composition of Fe41.9Ni34.4Co11.3Cr2.3Al6.9Ti3.2 (at. %) has been successfully developed by utilizing transformation-induced plasticity (TRIP) and high-density L12 nanolamellae to achieve ultrahigh yield strength (YS) and decent ductility. The aging treatment not only resulted in the precipitation of L12 lamellae, but also led to the enrichment of Fe, Co, and Cr into the fcc phase, creating a mechanically metastable fcc matrix. The metastable MEA strengthened by nanolamellar L12 precipitates exhibits an ultrahigh YS of ∼1.44 GPa, an ultimate tensile strength of ∼1.64 GPa, a uniform elongation of ∼22 %, and a total elongation of ∼31 %. The findings may provide a new approach for developing ultrastrong and ductile high/medium entropy alloys.

Original languageEnglish
Article number116100
JournalScripta Materialia
Volume247
DOIs
Publication statusPublished - 1 Jul 2024

Keywords

  • Mechanical properties
  • Medium entropy alloy
  • Metastable engineering
  • Nanolamellar L1 precipitates

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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