File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Nanoindentation behavior of nanostructured bulk (Fe,Cr)Al and (Fe,Cr)Al-Al2O3 nanocomposites

TitleNanoindentation behavior of nanostructured bulk (Fe,Cr)Al and (Fe,Cr)Al-Al2O3 nanocomposites
Authors
Keywords(Fe,Cr)Al-10%Al2O3 nanocomposite
Microstructure
Mechanical properties
High pressure consolidation
Nanoindentation
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jallcom
Citation
Journal of Alloys and Compounds, 2019, v. 792, p. 348-356 How to Cite?
AbstractThe purpose of the present study was to design a new generation of FeAl-based intermetallic compounds with improved mechanical and oxidation properties. Synthesis of powders of FeAl, (Fe,Cr)Al and (Fe,Cr)Al in situ composites with 5 and 10% Al2O3 contents was reported elsewhere. In this paper the sintering behavior is reported. FeAl, (Fe,Cr)Al and (Fe,Cr)Al - Al2O3 powders were sintered by a hot-pressing method at 1600 °C and 5.5 GPa for 15 min to produce bulk specimens for mechanical and microstructural characterization. Microstructural characterization by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) of theses nanocomposites disclosed uniform distribution of Al2O3 nano-particles. XRD analysis indicated the presence of FeAl, (Fe,Cr)Al and Al2O3 phases. The presence of nano-sized Al2O3 particles effectively retarded grain growth by pinning the grain boundary during hot pressing. Nanoindentation tests indicated that with increasing content of Cr and Al2O3 reinforcement, the hardness and Young's modulus increased, and the fracture toughness reaches a high value of 19.6 ± 0.4 MPa m1/2 for the (Fe,Cr)Al-10%Al2O3 composition, with a hardness value of 21.7 ± 1.8 GPa. Nanoindentation creep tests at room temperature showed that composites with Al2O3 nanoparticles had higher creep rate than FeAl and (Fe,Cr)Al. It was found that improvements in the mechanical properties of FeAl intermetallic compound can be achieved by adding Cr and uniform distribution of Al2O3 nanoparticles.
Persistent Identifierhttp://hdl.handle.net/10722/277106
ISSN
2019 Impact Factor: 4.65
2015 SCImago Journal Rankings: 1.006

 

DC FieldValueLanguage
dc.contributor.authorSourani, F-
dc.contributor.authorEnayati, MH-
dc.contributor.authorZhou, X-
dc.contributor.authorWang, S-
dc.contributor.authorNgan, AHW-
dc.date.accessioned2019-09-20T08:44:32Z-
dc.date.available2019-09-20T08:44:32Z-
dc.date.issued2019-
dc.identifier.citationJournal of Alloys and Compounds, 2019, v. 792, p. 348-356-
dc.identifier.issn0925-8388-
dc.identifier.urihttp://hdl.handle.net/10722/277106-
dc.description.abstractThe purpose of the present study was to design a new generation of FeAl-based intermetallic compounds with improved mechanical and oxidation properties. Synthesis of powders of FeAl, (Fe,Cr)Al and (Fe,Cr)Al in situ composites with 5 and 10% Al2O3 contents was reported elsewhere. In this paper the sintering behavior is reported. FeAl, (Fe,Cr)Al and (Fe,Cr)Al - Al2O3 powders were sintered by a hot-pressing method at 1600 °C and 5.5 GPa for 15 min to produce bulk specimens for mechanical and microstructural characterization. Microstructural characterization by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) of theses nanocomposites disclosed uniform distribution of Al2O3 nano-particles. XRD analysis indicated the presence of FeAl, (Fe,Cr)Al and Al2O3 phases. The presence of nano-sized Al2O3 particles effectively retarded grain growth by pinning the grain boundary during hot pressing. Nanoindentation tests indicated that with increasing content of Cr and Al2O3 reinforcement, the hardness and Young's modulus increased, and the fracture toughness reaches a high value of 19.6 ± 0.4 MPa m1/2 for the (Fe,Cr)Al-10%Al2O3 composition, with a hardness value of 21.7 ± 1.8 GPa. Nanoindentation creep tests at room temperature showed that composites with Al2O3 nanoparticles had higher creep rate than FeAl and (Fe,Cr)Al. It was found that improvements in the mechanical properties of FeAl intermetallic compound can be achieved by adding Cr and uniform distribution of Al2O3 nanoparticles.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jallcom-
dc.relation.ispartofJournal of Alloys and Compounds-
dc.subject(Fe,Cr)Al-10%Al2O3 nanocomposite-
dc.subjectMicrostructure-
dc.subjectMechanical properties-
dc.subjectHigh pressure consolidation-
dc.subjectNanoindentation-
dc.titleNanoindentation behavior of nanostructured bulk (Fe,Cr)Al and (Fe,Cr)Al-Al2O3 nanocomposites-
dc.typeArticle-
dc.identifier.emailNgan, AHW: hwngan@hku.hk-
dc.identifier.authorityNgan, AHW=rp00225-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jallcom.2019.04.012-
dc.identifier.scopuseid_2-s2.0-85064042545-
dc.identifier.hkuros305442-
dc.identifier.volume792-
dc.identifier.spage348-
dc.identifier.epage356-
dc.publisher.placeNetherlands-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats