Microstructural and magnetic characterization of iron precipitation in Ni-Fe-Al alloys

Duman, Nagehan; Mekhrabov, Amdulla O

doi:10.1016/J.MATCHAR.2011.04.006

Title: Microstructural and magnetic characterization of iron precipitation in Ni-Fe-Al alloys

Full Record
Other Related Research

Abstract

The influence of annealing on the microstructural evolution and magnetic properties of Ni{sub 50}Fe{sub x}Al{sub 50-x} alloys for x = 20, 25, and 30 has been investigated. Solidification microstructures of as-cast alloys reveal coarse grains of a single B2 type {beta}-phase and typical off eutectic microstructure consisting of proeutectic B2 type {beta} dendrites and interdendritic eutectic for x = 20 and x > 20 at.% Fe respectively. However, annealing at 1073 K results in the formation of FCC {gamma}-phase particles along the grain boundaries as well as grain interior in x = 20 at.% Fe alloy. The volume fraction of interdentritic eutectic regions tend to decrease and their morphologies start to degenerate by forming FCC {gamma}-phase for x > 20 at.% Fe alloys with increasing annealing temperatures. Increasing Fe content of alloys induce an enhancement in magnetization and a rise in the Curie transition temperature (T{sub C}). Temperature scan magnetic measurements and transmission electron microscopy reveal that a transient rise in the magnetization at temperatures well above the T{sub C} of the alloys would be attributed to the precipitation of a nano-scale ferromagnetic BCC {alpha}-Fe phase. Retained magnetization above the Curie transition temperature of alloy matrix, together with enhanced roommore »« less

Authors:: Duman, Nagehan; Mekhrabov, Amdulla O

Publication Date:: Wed Jun 15 00:00:00 EDT 2011

OSTI Identifier:: 22066370

Resource Type:: Journal Article

Journal Name:: Materials Characterization

Additional Journal Information:: Journal Volume: 62; Journal Issue: 6; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM ALLOYS; ANNEALING; BCC LATTICES; FCC LATTICES; GRAIN BOUNDARIES; HARDNESS; IRON ALLOYS; IRON-ALPHA; MAGNETIC PROPERTIES; MAGNETIZATION; NANOSTRUCTURES; NICKEL ALLOYS; PRECIPITATION; PRECIPITATION HARDENING; SOLIDIFICATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; TRANSITION TEMPERATURE; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats


                    Duman, Nagehan, Mekhrabov, Amdulla O, and Akdeniz, M. Vedat, E-mail: akdeniz@metu.edu.tr. Microstructural and magnetic characterization of iron precipitation in Ni-Fe-Al alloys.  United States: N. p., 2011. 
        Web.  doi:10.1016/J.MATCHAR.2011.04.006.

Copy to clipboard


                    Duman, Nagehan, Mekhrabov, Amdulla O, & Akdeniz, M. Vedat, E-mail: akdeniz@metu.edu.tr. Microstructural and magnetic characterization of iron precipitation in Ni-Fe-Al alloys.  United States.  https://doi.org/10.1016/J.MATCHAR.2011.04.006

Copy to clipboard


                    Duman, Nagehan, Mekhrabov, Amdulla O, and Akdeniz, M. Vedat, E-mail: akdeniz@metu.edu.tr. 2011.  
        "Microstructural and magnetic characterization of iron precipitation in Ni-Fe-Al alloys".  United States.  https://doi.org/10.1016/J.MATCHAR.2011.04.006.

Copy to clipboard


                    
@article{osti_22066370,

  title        = {Microstructural and magnetic characterization of iron precipitation in Ni-Fe-Al alloys},

  author       = {Duman, Nagehan and Mekhrabov, Amdulla O and Akdeniz, M. Vedat, E-mail: akdeniz@metu.edu.tr},

  abstractNote = {The influence of annealing on the microstructural evolution and magnetic properties of Ni{sub 50}Fe{sub x}Al{sub 50-x} alloys for x = 20, 25, and 30 has been investigated. Solidification microstructures of as-cast alloys reveal coarse grains of a single B2 type {beta}-phase and typical off eutectic microstructure consisting of proeutectic B2 type {beta} dendrites and interdendritic eutectic for x = 20 and x > 20 at.% Fe respectively. However, annealing at 1073 K results in the formation of FCC {gamma}-phase particles along the grain boundaries as well as grain interior in x = 20 at.% Fe alloy. The volume fraction of interdentritic eutectic regions tend to decrease and their morphologies start to degenerate by forming FCC {gamma}-phase for x > 20 at.% Fe alloys with increasing annealing temperatures. Increasing Fe content of alloys induce an enhancement in magnetization and a rise in the Curie transition temperature (T{sub C}). Temperature scan magnetic measurements and transmission electron microscopy reveal that a transient rise in the magnetization at temperatures well above the T{sub C} of the alloys would be attributed to the precipitation of a nano-scale ferromagnetic BCC {alpha}-Fe phase. Retained magnetization above the Curie transition temperature of alloy matrix, together with enhanced room temperature saturation magnetization of alloys annealed at favorable temperatures support the presence of ferromagnetic precipitates. These nano-scale precipitates are shown to induce significant precipitation hardening of the {beta}-phase in conjunction with enhanced room temperature saturation magnetization in particular when an annealing temperature of 673 K is used. - Research Highlights: {yields} Evolution of microstructure and magnetic properties with varying Fe content. {yields} Transient rise in magnetization via the formation of ferromagnetic phase. {yields} Enhancements in saturation magnetization owing to precipitated ferromagnetic phase. {yields} Nanoscale precipitation of ferromagnetic BCC {alpha}-Fe confirmed by TEM. {yields} Hardness of the {beta}-phase correlates with room temperature saturation magnetization.},

  doi          = {10.1016/J.MATCHAR.2011.04.006},

  url          = {https://www.osti.gov/biblio/22066370},
  journal      = {Materials Characterization},

  issn         = {1044-5803},

  number       = 6,

  volume       = 62,

  place        = {United States},

  year         = {Wed Jun 15 00:00:00 EDT 2011},

  month        = {Wed Jun 15 00:00:00 EDT 2011}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1016/J.MATCHAR.2011.04.006

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Deformation mechanisms in an additively manufactured dual-phase eutectic high-entropy alloy

Journal Article Ren, Jie; Wu, Margaret; Li, Chenyang; ... - Acta Materialia

Nanostructured metals and alloys often exhibit high strengths but at the expense of reduced ductility. Through harnessing the far-from-equilibrium processing conditions of laser powder-bed fusion (L-PBF) additive manufacturing, we develop a dual-phase nanolamellar structure comprised of FCC/L1₂ and BCC/B2 phases in a Ni₄₀Co₂₀Fe₁₀Cr₁₀Al₁₈W₂ eutectic high-entropy alloy (EHEA), which exhibits a combination of ultrahigh yield strength (>1.4 GPa) and large tensile ductility (∼17%). The deformation mechanisms of the additively manufactured EHEA are studied via in-situ synchrotron X-ray diffraction and high-resolution transmission electron microscopy. The high yield strength mainly results from effective blockage of dislocation motion by the high density of lamellarmore »« less
https://doi.org/10.1016/j.actamat.2023.119179
Influence of ordered L1₂ precipitation on strain-rate dependent mechanical behavior in a eutectic high entropy alloy

Journal Article Gwalani, Bharat; Gangireddy, Sindhura; Zheng, Yufeng; ... - Scientific Reports

Recent studies indicate that eutectic high-entropy alloys can simultaneously possess high strength and high ductility, which have potential industrial applications. The present study focuses on Al0.7CoCrFeNi, a lamellar dual-phase (fcc?+?B2) precipitation-strengthenable eutectic high entropy alloy. This alloy exhibits an fcc?+?B2 (B2 with bcc nano-precipitates) microstructure resulting in a combination of the soft and ductile fcc phase together with hard B2 phase. Low temperature annealing leads to the precipitation of ordered L12 intermetallic precipitates within the fcc resulting in enhanced strength. The strengthening contribution due to fine scale L12 is modeled using Orowan dislocation bowing and by-pass mechanism. The alloy wasmore »« less
Cited by 39
https://doi.org/10.1038/s41598-019-42870-y

Full Text Available
Room-temperature deformation behavior of directionally solidified multiphase Ni-Fe-Al alloys

Journal Article Misra, A; Gibala, R - Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

Directionally solidified (DS) {beta} + ({gamma} + {gamma}{prime}) Ni-Fe-Al alloys have been used to investigate the effect of a ductile second phase on the room-temperature mechanical behavior of a brittle <001>-oriented {beta} (B2) phase. The ductile phase in the composite consisted of a fine distribution of ordered {gamma}{prime} precipitates in a {gamma} (fcc) matrix. Three microstructures were studied: 100 pct lamellar/rod, lamellar + Proeutectic {beta}, and discontinuous {gamma}. The {beta} matrix in the latter two microstructures contained fine-scale bcc precipitates formed due to spinodal decomposition. Room-temperature tensile ductilities as high as 12 pct and fracture toughness (K{sub Q}) of 30.4more »« less
https://doi.org/10.1007/s11661-997-0066-x
Experimental and Computational Investigation of High Entropy Alloys for Elevated-Temperature Applications

Technical Report Liaw, Peter; Zhang, Fan; Zhang, Chuan; ...

To create and design novel structural materials with enhanced creep-resistance, fundamental studies have been conducted on high-entropy alloys (HEAs), using (1) thermodynamic calculations, (2) mechanical tests, (3) neutron diffraction, (4) characterization techniques, and (5) crystal-plasticity finite-element modeling (CPFEM), to explore future candidates for next-generation power plants. All the constituent binary and ternary systems of the Al-Cr-Cu-Fe-Mn-Ni and Al-Co-Cr-Fe-Ni systems were thermodynamically modeled within the whole composition range. Comparisons between the calculated phase diagrams and literature data are in good agreement. Seven types of HEAs were fabricated from Al-Cr-Cu-Fe-Mn-Ni and Al-Co-Cr-Fe-Ni systems. The Al_xCrCuFeMnNi HEAs have disordered [face-centered cubic (FCC) +more »« less
https://doi.org/10.2172/1337018

Full Text Available
Hierarchical Eutectoid Nano-lamellar Decomposition in an Al_0.3CoFeNi Complex Concentrated Alloy

Journal Article Dasari, Sriswaroop; Gwalani, Bharat; Jagetia, Abhinav; ... - Scientific Reports

This paper reports a novel eutectoid nano-lamellar (FCC + L1₂)/(BCC + B2) microstructure that has been discovered in a relatively simple Al_0.3CoFeNi high entropy alloy (HEA) or complex concentrated alloy (CCA). This novel eutectoid nano-lamellar microstructure presumably results from the complex interplay between Al-mediated lattice distortion (due to its larger atomic radius) in a face-centered cubic (FCC) CoFeNi solid solution, and a chemical ordering tendency leading to precipitation of ordered phases such as L1₂ and B2. This eutectoid microstructure is a result of solid-state decomposition of the FCC matrix and therefore distinct from the commonly reported eutectic microstructure in HEAsmore »« less
https://doi.org/10.1038/s41598-020-61538-6

Full Text Available

Similar Records