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

Wang, Zhangwei; Wu, Margaret; Cai, Zhonghou; Chen, Si; Baker, Ian

doi:10.1016/j.intermet.2016.06.001

Title: Effect of Ti content on the microstructure and mechanical behavior of (Fe₃₆Ni₁₈Mn₃₃Al₁₃)_100–xTi_x high entropy alloys

Journal Article · Mon Jun 13 00:00:00 EDT 2016 · Intermetallics

DOI:https://doi.org/10.1016/j.intermet.2016.06.001· OSTI ID:1340293

Wang, Zhangwei ^[1]; Wu, Margaret ^[1]; Cai, Zhonghou ^[2]; Chen, Si ^[2]; Baker, Ian ^[1]

Dartmouth College, Hanover, NH (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)

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 mu m for the undoped alloy to 155 nm with an addition of 4 at. % Ti, leading to a sharp increase in room-temperature yield strength, sigma(y), 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 sigma(y) 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. The results are discussed in terms of the Hall-Petch-type relationship.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; FG02-07ER46392

OSTI ID:: 1340293

Alternate ID(s):: OSTI ID: 1324378; OSTI ID: 1395832

Journal Information:: Intermetallics, Vol. 75, Issue C; ISSN 0966-9795

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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Effect of Heat Treatment and Titanium Addition on the Microstructure and Mechanical Properties of Cast Fe ₃₁ Mn ₂₈ Ni ₁₅ Al _24.5 Ti _x High-Entropy Alloys El-Hadad, Shimaa; Ibrahim, Mervat; Mourad, Mohamed Advances in Materials Science and Engineering, Vol. 2019 https://doi.org/10.1155/2019/2157592	journal	January 2019

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

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Title: Effect of Ti content on the microstructure and mechanical behavior of (Fe₃₆Ni₁₈Mn₃₃Al₁₃)_100–xTi_x high entropy alloys