Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K

An experimental study of the phase equilibria of the Ho-rich part of the Ho-Ir-O ternary system at 1073 K by means of x-ray diffraction, differential scanning calorimetry, and scanning electron microscopy has been carried out. Ho-hcp and four binary compounds, namely Ho(3)Ir, Ho(5)Ir(2), Ho(5)Ir(3),...

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Autores principales: Homolová, Viera, Čiripová, Lucia, Zobač, Ondřej, Zemanová, Adéla, Falat, Ladislav
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Communication
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10419622/
https://www.ncbi.nlm.nih.gov/pubmed/37570110
http://dx.doi.org/10.3390/ma16155406
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author Homolová, Viera
Čiripová, Lucia
Zobač, Ondřej
Zemanová, Adéla
Falat, Ladislav
author_facet Homolová, Viera
Čiripová, Lucia
Zobač, Ondřej
Zemanová, Adéla
Falat, Ladislav
author_sort Homolová, Viera
collection PubMed
description An experimental study of the phase equilibria of the Ho-rich part of the Ho-Ir-O ternary system at 1073 K by means of x-ray diffraction, differential scanning calorimetry, and scanning electron microscopy has been carried out. Ho-hcp and four binary compounds, namely Ho(3)Ir, Ho(5)Ir(2), Ho(5)Ir(3), and Ho(2)O(3), were identified in the Ho-Ir-O model alloys after long-term annealing (350–1220 h). No solubility of iridium in Ho(2)O(3) oxide and Ho-hcp was observed. No ternary phase was found. Based on the experimental results, an isothermal section of the Ho-rich part of the Ho-Ir-O system at 1073 K was constructed. In addition, the microstructure of as-cast alloys was studied. An irregular eutectic consisting of faceted Ho-phase in Ho(3)Ir phase was observed in the alloys with Ho-hcp + Ho(3)Ir + Ho(2)O(3) phase composition, and the temperature of the eutectic reaction Ho-hcp + Ho(3)Ir ↔ liquid was determined.
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spelling pubmed-104196222023-08-12 Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K Homolová, Viera Čiripová, Lucia Zobač, Ondřej Zemanová, Adéla Falat, Ladislav Materials (Basel) Communication An experimental study of the phase equilibria of the Ho-rich part of the Ho-Ir-O ternary system at 1073 K by means of x-ray diffraction, differential scanning calorimetry, and scanning electron microscopy has been carried out. Ho-hcp and four binary compounds, namely Ho(3)Ir, Ho(5)Ir(2), Ho(5)Ir(3), and Ho(2)O(3), were identified in the Ho-Ir-O model alloys after long-term annealing (350–1220 h). No solubility of iridium in Ho(2)O(3) oxide and Ho-hcp was observed. No ternary phase was found. Based on the experimental results, an isothermal section of the Ho-rich part of the Ho-Ir-O system at 1073 K was constructed. In addition, the microstructure of as-cast alloys was studied. An irregular eutectic consisting of faceted Ho-phase in Ho(3)Ir phase was observed in the alloys with Ho-hcp + Ho(3)Ir + Ho(2)O(3) phase composition, and the temperature of the eutectic reaction Ho-hcp + Ho(3)Ir ↔ liquid was determined. MDPI 2023-08-01 /pmc/articles/PMC10419622/ /pubmed/37570110 http://dx.doi.org/10.3390/ma16155406 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Homolová, Viera
Čiripová, Lucia
Zobač, Ondřej
Zemanová, Adéla
Falat, Ladislav
Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K
title Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K
title_full Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K
title_fullStr Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K
title_full_unstemmed Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K
title_short Experimental Investigation of Phase Equilibria of the Ho-Ir-O Ternary System at 1073 K
title_sort experimental investigation of phase equilibria of the ho-ir-o ternary system at 1073 k
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10419622/
https://www.ncbi.nlm.nih.gov/pubmed/37570110
http://dx.doi.org/10.3390/ma16155406
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