Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods

Melting metallurgy is still the most frequently used and simplest method for the processing of metallic materials. Some of the materials (especially intermetallics) are very difficult to prepare by this method due to the high melting points, poor fluidity, or formation of cracks and pores after cast...

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Main Authors: Anna Knaislová, Pavel Novák, Jaromír Kopeček, Filip Průša
Format: Article
Language:English
Published: MDPI AG 2019-09-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/12/19/3084
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spelling doaj-ffd6c20f11b341c7a82eb4ef52034c0f2020-11-25T01:49:56ZengMDPI AGMaterials1996-19442019-09-011219308410.3390/ma12193084ma12193084Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy MethodsAnna Knaislová0Pavel Novák1Jaromír Kopeček2Filip Průša3Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech RepublicInstitute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech RepublicMelting metallurgy is still the most frequently used and simplest method for the processing of metallic materials. Some of the materials (especially intermetallics) are very difficult to prepare by this method due to the high melting points, poor fluidity, or formation of cracks and pores after casting. This article describes the processing of Ti-Al-Si alloys by arc melting, and shows the microstructure, phase composition, hardness, fracture toughness, and compression tests of these alloys. These results are compared with the same alloys prepared by powder metallurgy by the means of a combination of mechanical alloying and spark plasma sintering. Ti-Al-Si alloys processed by melting metallurgy are characterized by a very coarse structure with central porosity. The phase composition is formed by titanium aluminides and titanium silicides, which are full of cracks. Ti-Al-Si alloys processed by the powder metallurgy route have a relatively homogeneous fine-grained structure with higher hardness. However, these alloys are very brittle. On the other hand, the fracture toughness of arc-melted samples is immeasurable using Palmqvist’s method because the crack is stopped by a large area of titanium aluminide matrix.https://www.mdpi.com/1996-1944/12/19/3084titanium aluminides and silicidescastingpowder metallurgy
collection DOAJ
language English
format Article
sources DOAJ
author Anna Knaislová
Pavel Novák
Jaromír Kopeček
Filip Průša
spellingShingle Anna Knaislová
Pavel Novák
Jaromír Kopeček
Filip Průša
Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods
Materials
titanium aluminides and silicides
casting
powder metallurgy
author_facet Anna Knaislová
Pavel Novák
Jaromír Kopeček
Filip Průša
author_sort Anna Knaislová
title Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods
title_short Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods
title_full Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods
title_fullStr Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods
title_full_unstemmed Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods
title_sort properties comparison of ti-al-si alloys produced by various metallurgy methods
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-09-01
description Melting metallurgy is still the most frequently used and simplest method for the processing of metallic materials. Some of the materials (especially intermetallics) are very difficult to prepare by this method due to the high melting points, poor fluidity, or formation of cracks and pores after casting. This article describes the processing of Ti-Al-Si alloys by arc melting, and shows the microstructure, phase composition, hardness, fracture toughness, and compression tests of these alloys. These results are compared with the same alloys prepared by powder metallurgy by the means of a combination of mechanical alloying and spark plasma sintering. Ti-Al-Si alloys processed by melting metallurgy are characterized by a very coarse structure with central porosity. The phase composition is formed by titanium aluminides and titanium silicides, which are full of cracks. Ti-Al-Si alloys processed by the powder metallurgy route have a relatively homogeneous fine-grained structure with higher hardness. However, these alloys are very brittle. On the other hand, the fracture toughness of arc-melted samples is immeasurable using Palmqvist’s method because the crack is stopped by a large area of titanium aluminide matrix.
topic titanium aluminides and silicides
casting
powder metallurgy
url https://www.mdpi.com/1996-1944/12/19/3084
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AT pavelnovak propertiescomparisonoftialsialloysproducedbyvariousmetallurgymethods
AT jaromirkopecek propertiescomparisonoftialsialloysproducedbyvariousmetallurgymethods
AT filipprusa propertiescomparisonoftialsialloysproducedbyvariousmetallurgymethods
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