Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys

This work focuses on the examination of two High Entropy Alloys (HEAs), the AlTiVCr and AlTiVCr–Si7.2, which have been observed to fail in a brittle manner directly after casting. Understanding the failure mechanics is a prerequisite for an alternative enhanced alloy design in order to prevent early...

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Autores principales:	Chaskis Spyridon, Kiousis Dimitrios, Stavroulakis Pavlos, Goodall Russell, Papaefthymiou Spyros
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/16f6444932b14e6da586e27b09da8b5e
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spelling	oai:doaj.org-article:16f6444932b14e6da586e27b09da8b5e2021-12-02T17:13:46ZExamination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys2261-236X10.1051/matecconf/202134902002https://doaj.org/article/16f6444932b14e6da586e27b09da8b5e2021-01-01T00:00:00Zhttps://www.matec-conferences.org/articles/matecconf/pdf/2021/18/matecconf_iceaf2021_02002.pdfhttps://doaj.org/toc/2261-236XThis work focuses on the examination of two High Entropy Alloys (HEAs), the AlTiVCr and AlTiVCr–Si7.2, which have been observed to fail in a brittle manner directly after casting. Understanding the failure mechanics is a prerequisite for an alternative enhanced alloy design in order to prevent early failure without loading application. The specimens were produced using the Vacuum Arc Melting methodology in a protective argon atmosphere. The material was re–melted five times in combination with electromagnetic stirring in order to achieve a fully homogenized microstructure. Based on our findings, the failure occurred in the first 10 minutes after casting during slow cooling. Similarly, the same took place during thermal treatment after the third re–melting. The specimens were first prepared for optical (OM) and scanning electron microscopy (SEM) analysis. The material consists of a coarse dendritic microstructure as well as a retained BCC phase, which is the AlTiVCr phase. In the AlTiVCr – Si7.2 alloy a uniformly dispersed, angular intermetallic compound, namely the Ti5Si3, was identified, which increases the failure resistance of the material. Based on these findings the alloy will be redesigned.Chaskis SpyridonKiousis DimitriosStavroulakis PavlosGoodall RussellPapaefthymiou SpyrosEDP SciencesarticleEngineering (General). Civil engineering (General)TA1-2040ENFRMATEC Web of Conferences, Vol 349, p 02002 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Chaskis Spyridon Kiousis Dimitrios Stavroulakis Pavlos Goodall Russell Papaefthymiou Spyros Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys
description	This work focuses on the examination of two High Entropy Alloys (HEAs), the AlTiVCr and AlTiVCr–Si7.2, which have been observed to fail in a brittle manner directly after casting. Understanding the failure mechanics is a prerequisite for an alternative enhanced alloy design in order to prevent early failure without loading application. The specimens were produced using the Vacuum Arc Melting methodology in a protective argon atmosphere. The material was re–melted five times in combination with electromagnetic stirring in order to achieve a fully homogenized microstructure. Based on our findings, the failure occurred in the first 10 minutes after casting during slow cooling. Similarly, the same took place during thermal treatment after the third re–melting. The specimens were first prepared for optical (OM) and scanning electron microscopy (SEM) analysis. The material consists of a coarse dendritic microstructure as well as a retained BCC phase, which is the AlTiVCr phase. In the AlTiVCr – Si7.2 alloy a uniformly dispersed, angular intermetallic compound, namely the Ti5Si3, was identified, which increases the failure resistance of the material. Based on these findings the alloy will be redesigned.
format	article
author	Chaskis Spyridon Kiousis Dimitrios Stavroulakis Pavlos Goodall Russell Papaefthymiou Spyros
author_facet	Chaskis Spyridon Kiousis Dimitrios Stavroulakis Pavlos Goodall Russell Papaefthymiou Spyros
author_sort	Chaskis Spyridon
title	Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys
title_short	Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys
title_full	Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys
title_fullStr	Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys
title_full_unstemmed	Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys
title_sort	examination of fracture mechanisms in two al – ti – v – cr – (si) high entropy alloys
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/16f6444932b14e6da586e27b09da8b5e
work_keys_str_mv	AT chaskisspyridon examinationoffracturemechanismsintwoaltivcrsihighentropyalloys AT kiousisdimitrios examinationoffracturemechanismsintwoaltivcrsihighentropyalloys AT stavroulakispavlos examinationoffracturemechanismsintwoaltivcrsihighentropyalloys AT goodallrussell examinationoffracturemechanismsintwoaltivcrsihighentropyalloys AT papaefthymiouspyros examinationoffracturemechanismsintwoaltivcrsihighentropyalloys
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Examination of Fracture Mechanisms in two Al – Ti – V – Cr – (Si) High Entropy Alloys

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