Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Microstructural evolution and room-temperature mechanical properties of as-cast and heat-treated Fe50Al50-nNbn alloys (n=1, 3, 5, 7, and 9 at%)
Date
2016-05-10
Author
Yıldırım, Mehmet
Akdeniz, Mahmut Vedat
Mehrabov, Amdulla
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
214
views
0
downloads
Cite This
The microstructural evolution and room-temperature mechanical properties of Fe50Al50-nNbn alloys (n=1, 3, 5, 7, and 9 at%) were investigated after solidification and subsequent heat treatment. For all the compositions, the (Fe, Al)(2)Nb Laves phase formed because of the incomplete solid solubility of Nb in the Fe-Al-based phases and tended to develop an eutectic mixture with the Fe-Al-based phase. According to the results of EDS analysis and microstructural investigations, the Nb concentration of the eutectic composition was 9 at%, and the solid solubility of Nb in the B2-type Fe-Al-based phase was 3 at%. In addition, the eutectic phase transition temperature was approximately 1265 degrees C. Compared with the as cast state, all the heat-treated alloys exhibited ultrahigh compressive strength and considerably increased compressive fracture strains. The heat-treated hypoeutectic Fe50Al42Nb3 alloy exhibited the highest compressive strength and fracture strain of 3.02 GPa and 33.1%, respectively, and the eutectic Fe(50)oAl(41)Nb(9) alloy exhibited the lowest compressive strength and fracture strain of 2.66 GPa and 21.8%, respectively, because of the absence of the comparably softer Fe-Al-based primary dendrites. The superior mechanical properties of the heat-treated alloys were attributed to the bimodal distribution of the microstructure, structural incoherency between the crystalline phases, and elimination of solidification artifacts and lattice defects.
Subject Keywords
Iron aluminides (based on FeAl)
,
Microstructure
,
Mechanical properties at ambient temperatures
,
Compressive properties
URI
https://hdl.handle.net/11511/49283
Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
DOI
https://doi.org/10.1016/j.msea.2016.03.128
Collections
Department of Metallurgical and Materials Engineering, Article
Suggestions
OpenMETU
Core
Microstructure, phase relationships and microhardness of Fe60Al40-nHfn alloys (n=1, 3, and 5 at.%)
Yildirim, Mehmet; Cetinbakis, Nese; Culu, Ayse; Akdeniz, Mahmut Vedat; Mehrabov, Amdulla (2021-04-01)
The microstructural evolution, solidification behavior, phase relationships, microhardness and room temperature magnetic properties of the hypoeutectic Fe60Al40-nHfn (n = 1, 3, and 5 at.%) compositions are investigated in detail. The microstructure of the studied alloys is composed of Fe-Al based dendrites and eutectic mixture. The components of the eutectic are B2 Fe-Al based and HfFe6Al6 tau(1) phases. With increasing Hf fraction, the amounts of eutectic and tau(1) phases increase continuously which resul...
Effect of Mo addition on microstructure, ordering, and room-temperature mechanical properties of Fe-50Al
Yildirim, Mehmet; Akdeniz, Mahmut Vedat; Mehrabov, Amdulla (2018-10-01)
The effects of Mo addition on microstructures, phase relationships, order-disorder phase-transition temperatures and room-temperature mechanical properties of Fe50Al50-nMon alloys (n=1, 3, 5, 7, and 9, mole fraction, %) were investigated after solidification and heat treatment. Structural characterization of the samples was performed via X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry. Room-temperature mechanical properties were investigated by conducting co...
Microalloying effects on the microstructure and kinetics of nanoscale precipitation in Ni-Al-Fe alloy
Duman, Nagehan; Mehrabov, Amdulla; Akdeniz, Mahmut Vedat (2012-04-01)
The aim of this study is to investigate the influence of 3d transition metal (Co, Mn and V) microalloying on the microstructural evolution, thermomagnetic properties and kinetics of nanoscale precipitation in Ni-25Al-25Fe alloy. The three phase solidification microstructure comprising of dendritic beta-phase (ordered bcc) and interdendritic beta + gamma (disordered fcc) + gamma' (ordered fcc) phases in the as-cast state is significantly altered by annealing. Needle-like disordered gamma-phase precipitates a...
Microstructure and nanomechanical behavior of sputtered CuNb thin films
Abboud, Mohammad; Motallebzadeh, Amir; Duygulu, Özgür; Maaß, Robert; Özerinç, Sezer (2021-09-01)
We report on the mechanical properties of Cu–Nb alloys produced by combinatorial magnetron sputtering. Depending on the composition, the microstructure is either fully amorphous (~30–65 at.% Cu), a dispersion of Cu crystallites in an amorphous matrix (~70 at.%), or a dominant crystalline phase with separated nanoscale amorphous zones (~80 at.% Cu). Nanomechanical probing of the different microstructures reveals that the hardness of the fully amorphous alloy is much higher than a rule of mixture would predic...
Microstructural, biological and mechanical investigations of hydroxyapatite-β-tricalcium phosphate composites doped with strontium and fluoride
Pourreza, Elmira; Evis, Zafer; Department of Engineering Sciences (2016)
The aim of this study was to investigate the microstructure, mechanical and biological properties of biphasic hydroxyapatite--Tricalcium phosphate (HT) and HT substituted with constant fluoride (F−) and varying strontium (Sr2+) amounts. All the samples were synthesized via precipitation method and sintered at 1100°C for 1 h. It was observed that the relative density of the sintered strontium and fluoride doped HT slightly increased. For microstructural analysis, X-ray diffraction (XRD), scanning electron m...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
M. Yıldırım, M. V. Akdeniz, and A. Mehrabov, “Microstructural evolution and room-temperature mechanical properties of as-cast and heat-treated Fe50Al50-nNbn alloys (n=1, 3, 5, 7, and 9 at%),”
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
, pp. 17–25, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/49283.