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Article

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

1
Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech Republic
2
Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2019, 12(19), 3084; https://doi.org/10.3390/ma12193084
Received: 9 September 2019 / Revised: 18 September 2019 / Accepted: 19 September 2019 / Published: 21 September 2019
(This article belongs to the Collection Advanced Powder Metallurgy Technologies)
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. View Full-Text
Keywords: titanium aluminides and silicides; casting; powder metallurgy titanium aluminides and silicides; casting; powder metallurgy
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MDPI and ACS Style

Knaislová, A.; Novák, P.; Kopeček, J.; Průša, F. Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods. Materials 2019, 12, 3084. https://doi.org/10.3390/ma12193084

AMA Style

Knaislová A, Novák P, Kopeček J, Průša F. Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods. Materials. 2019; 12(19):3084. https://doi.org/10.3390/ma12193084

Chicago/Turabian Style

Knaislová, Anna, Pavel Novák, Jaromír Kopeček, and Filip Průša. 2019. "Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods" Materials 12, no. 19: 3084. https://doi.org/10.3390/ma12193084

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