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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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 |
work_keys_str_mv |
AT annaknaislova propertiescomparisonoftialsialloysproducedbyvariousmetallurgymethods AT pavelnovak propertiescomparisonoftialsialloysproducedbyvariousmetallurgymethods AT jaromirkopecek propertiescomparisonoftialsialloysproducedbyvariousmetallurgymethods AT filipprusa propertiescomparisonoftialsialloysproducedbyvariousmetallurgymethods |
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1725003873878278144 |