The effects of annealing on the microstructure and mechanical properties of Fe28Ni18Mn33Al21

Meng, Fanling; Qiu, Jingwen; Baker, Ian; Bei, Hongbin

doi:10.1007/s10853-015-9353-x

Title: The effects of annealing on the microstructure and mechanical properties of Fe₂₈Ni₁₈Mn₃₃Al₂₁

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Abstract

In this paper, As-cast Fe₂₈Ni₁₈Mn₃₃Al₂₁, which consists of aligned, 50 nm, (Ni, Al)-rich B2, and (Fe, Mn)-rich f.c.c. phases, was annealed at a variety of temperatures up to 1423 K and the microstructure and mechanical properties were examined. It was shown that the as-cast microstructure arises from a eutectoid transformation at ~1300 K. Annealing at temperatures ≤1073 K produces β-Mn-structured precipitates and hardness values up to 816 HV, while annealing at temperatures >1073 K leads to dramatic coarsening of the two-phase B2/f.c.c. microstructure (up to 5.5 µm after 50 h at 1273 K), but does not lead to β-Mn precipitation. Interestingly, annealing at temperatures >1073 K delays the onset of β-Mn precipitation during subsequent anneals at lower temperatures. Coarsening the B2/f.c.c. lamellar structure by annealing at higher temperatures softens it and leads to increases in ductility from fracture before yield to ~8 % elongation. Finally, the presence of β-Mn precipitates makes the very fine, brittle B2/f.c.c. microstructures even more brittle, but significant ductility (8.4 % elongation) is possible even with β-Mn precipitates present if the B2/f.c.c. matrix is coarse and, hence, more ductile.

Authors:

Meng, Fanling ^[1]; Qiu, Jingwen ^[2]; Baker, Ian ^[1]; Bei, Hongbin ^[3]

Dartmouth College, Hanover, NH (United States). Thayer School of Engineering
Dartmouth College, Hanover, NH (United States). Thayer School of Engineering; Hunan Univ. of Science and Technology, Xiangtan (China). College of Electrical and Mechanical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

Publication Date:: Thu Aug 20 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1265631

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Materials Science

Additional Journal Information:: Journal Volume: 50; Journal Issue: 23; Journal ID: ISSN 0022-2461

Publisher:: Springer

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

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                    Meng, Fanling, Qiu, Jingwen, Baker, Ian, and Bei, Hongbin. The effects of annealing on the microstructure and mechanical properties of Fe28Ni18Mn33Al21.  United States: N. p., 2015. 
Web.  doi:10.1007/s10853-015-9353-x.

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                    Meng, Fanling, Qiu, Jingwen, Baker, Ian, & Bei, Hongbin. The effects of annealing on the microstructure and mechanical properties of Fe28Ni18Mn33Al21.  United States.  https://doi.org/10.1007/s10853-015-9353-x

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                    Meng, Fanling, Qiu, Jingwen, Baker, Ian, and Bei, Hongbin. Thu .  
"The effects of annealing on the microstructure and mechanical properties of Fe28Ni18Mn33Al21".  United States.  https://doi.org/10.1007/s10853-015-9353-x.  https://www.osti.gov/servlets/purl/1265631.

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@article{osti_1265631,

  title        = {The effects of annealing on the microstructure and mechanical properties of Fe28Ni18Mn33Al21},

  author       = {Meng, Fanling and Qiu, Jingwen and Baker, Ian and Bei, Hongbin},

  abstractNote = {In this paper, As-cast Fe28Ni18Mn33Al21, which consists of aligned, 50 nm, (Ni, Al)-rich B2, and (Fe, Mn)-rich f.c.c. phases, was annealed at a variety of temperatures up to 1423 K and the microstructure and mechanical properties were examined. It was shown that the as-cast microstructure arises from a eutectoid transformation at ~1300 K. Annealing at temperatures ≤1073 K produces β-Mn-structured precipitates and hardness values up to 816 HV, while annealing at temperatures >1073 K leads to dramatic coarsening of the two-phase B2/f.c.c. microstructure (up to 5.5 µm after 50 h at 1273 K), but does not lead to β-Mn precipitation. Interestingly, annealing at temperatures >1073 K delays the onset of β-Mn precipitation during subsequent anneals at lower temperatures. Coarsening the B2/f.c.c. lamellar structure by annealing at higher temperatures softens it and leads to increases in ductility from fracture before yield to ~8 % elongation. Finally, the presence of β-Mn precipitates makes the very fine, brittle B2/f.c.c. microstructures even more brittle, but significant ductility (8.4 % elongation) is possible even with β-Mn precipitates present if the B2/f.c.c. matrix is coarse and, hence, more ductile.},

  doi          = {10.1007/s10853-015-9353-x},

  journal      = {Journal of Materials Science},

  number       = 23,

  volume       = 50,

  place        = {United States},

  year         = {Thu Aug 20 00:00:00 EDT 2015},

  month        = {Thu Aug 20 00:00:00 EDT 2015}

}

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Title: The effects of annealing on the microstructure and mechanical properties of Fe28Ni18Mn33Al21

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Title: The effects of annealing on the microstructure and mechanical properties of Fe₂₈Ni₁₈Mn₃₃Al₂₁