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Title: Effect of Ti content on the microstructure and mechanical behavior of (Fe36Ni18Mn33Al13)100–xTix high entropy alloys

The microstructure and mechanical properties studies of a series of two-phase f.c.c./B2 (ordered b.c.c.) lamellar-structured, high entropy alloys (HEA) Fe36Ni18Mn33Al13Tix with x up to 6 at. % Ti have been investigated. X-ray microanalysis in a TEM showed that the Ti resided mostly in the B2 phase. The lamellar spacing decreased significantly with increasing Ti content from 1.56 μm for the undoped alloy to 155 nm with an addition of 4 at. % Ti, leading to a sharp increase in room-temperature yield strength,σy, from 270 MPa to 953 MPa, but with a concomitant decrease in ductility from 22% elongation to 2.3%. Annealing at 1173 K for 20 h greatly increased the lamellar spacing of Fe36Ni18Mn33Al13Ti4 to 577 nm, producing a corresponding decrease in σy to 511 MPa. The yield strengths of all the doped alloys decreased significantly when tensile tested at 973 K with a concomitant increase in ductility due to softening of the B2 phase. The fracture mode changed from cleavage at room temperature to a ductile dimple-type rupture at 973 K. Lastly, the results are discussed in terms of the Hall-Petch-type relationship.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1]
  1. Dartmouth College, Hanover, NH (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
OSTI Identifier:
1340293
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Intermetallics
Additional Journal Information:
Journal Volume: 75; Journal Issue: C; Journal ID: ISSN 0966-9795
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) - Scientific User Facilities Division
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE Hall-Petch-type relationship; high-entropy alloys; mechanical properties; microstructure