Cargando…

Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect?

A need to deeper understand the influence of electric current on the structure and properties of metallic materials consolidated by Spark Plasma Sintering (SPS) stimulates research on inter-particle interactions, bonding and necking processes in low-pressure or pressureless conditions as favoring te...

Descripción completa

Detalles Bibliográficos
Autores principales: Dudina, Dina V., Bokhonov, Boris B., Mukherjee, Amiya K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5503014/
https://www.ncbi.nlm.nih.gov/pubmed/28773498
http://dx.doi.org/10.3390/ma9050375
_version_ 1783249026105212928
author Dudina, Dina V.
Bokhonov, Boris B.
Mukherjee, Amiya K.
author_facet Dudina, Dina V.
Bokhonov, Boris B.
Mukherjee, Amiya K.
author_sort Dudina, Dina V.
collection PubMed
description A need to deeper understand the influence of electric current on the structure and properties of metallic materials consolidated by Spark Plasma Sintering (SPS) stimulates research on inter-particle interactions, bonding and necking processes in low-pressure or pressureless conditions as favoring technique-specific local effects when electric current passes through the underdeveloped inter-particle contacts. Until now, inter-particle interactions during pressureless SPS have been studied mainly for particles of the same material. In this work, we focused on the interactions between particles of dissimilar materials in mixtures of micrometer-sized Fe and Al powders forming porous compacts during pressureless SPS at 500–650 °C. Due to the chemical interaction between Al and Fe, necks of conventional shape did not form between the dissimilar particles. At the early interaction stages, the Al particles acquired shell morphology. It was shown that this morphology change was not related to the influence of electric current but was due to the Kirkendall effect in the Fe–Al system and particle rearrangement in a porous compact. No experimental evidence of melting or melt ejection during pressureless SPS of the Fe–Al mixtures or Fe and Al powders sintered separately was observed. Porous FeAl-based compacts could be obtained from Fe-40at.%Al mixtures by pressureless SPS at 650 °C.
format Online
Article
Text
id pubmed-5503014
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-55030142017-07-28 Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect? Dudina, Dina V. Bokhonov, Boris B. Mukherjee, Amiya K. Materials (Basel) Article A need to deeper understand the influence of electric current on the structure and properties of metallic materials consolidated by Spark Plasma Sintering (SPS) stimulates research on inter-particle interactions, bonding and necking processes in low-pressure or pressureless conditions as favoring technique-specific local effects when electric current passes through the underdeveloped inter-particle contacts. Until now, inter-particle interactions during pressureless SPS have been studied mainly for particles of the same material. In this work, we focused on the interactions between particles of dissimilar materials in mixtures of micrometer-sized Fe and Al powders forming porous compacts during pressureless SPS at 500–650 °C. Due to the chemical interaction between Al and Fe, necks of conventional shape did not form between the dissimilar particles. At the early interaction stages, the Al particles acquired shell morphology. It was shown that this morphology change was not related to the influence of electric current but was due to the Kirkendall effect in the Fe–Al system and particle rearrangement in a porous compact. No experimental evidence of melting or melt ejection during pressureless SPS of the Fe–Al mixtures or Fe and Al powders sintered separately was observed. Porous FeAl-based compacts could be obtained from Fe-40at.%Al mixtures by pressureless SPS at 650 °C. MDPI 2016-05-14 /pmc/articles/PMC5503014/ /pubmed/28773498 http://dx.doi.org/10.3390/ma9050375 Text en © 2016 by the authors; Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dudina, Dina V.
Bokhonov, Boris B.
Mukherjee, Amiya K.
Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect?
title Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect?
title_full Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect?
title_fullStr Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect?
title_full_unstemmed Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect?
title_short Formation of Aluminum Particles with Shell Morphology during Pressureless Spark Plasma Sintering of Fe–Al Mixtures: Current-Related or Kirkendall Effect?
title_sort formation of aluminum particles with shell morphology during pressureless spark plasma sintering of fe–al mixtures: current-related or kirkendall effect?
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5503014/
https://www.ncbi.nlm.nih.gov/pubmed/28773498
http://dx.doi.org/10.3390/ma9050375
work_keys_str_mv AT dudinadinav formationofaluminumparticleswithshellmorphologyduringpressurelesssparkplasmasinteringoffealmixturescurrentrelatedorkirkendalleffect
AT bokhonovborisb formationofaluminumparticleswithshellmorphologyduringpressurelesssparkplasmasinteringoffealmixturescurrentrelatedorkirkendalleffect
AT mukherjeeamiyak formationofaluminumparticleswithshellmorphologyduringpressurelesssparkplasmasinteringoffealmixturescurrentrelatedorkirkendalleffect