Preparation of TiAl15Si15 intermetallic alloy by mechanical alloying and the spark plasma sintering method

Knaislová, Anna; Linhart, Jiří; Novák, Pavel; Průša, Filip; Kopeček, Jaromı́r; Laufek, František; Vojtěch, Dalibor

doi:10.1080/00325899.2019.1569812

Cited by 15 publications

(17 citation statements)

References 22 publications

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“…The TiAl15Si15 alloy achieves the higher ultimate tensile strength in compression—1700 MPa. This value of UTS is comparable with the same alloy processed by the combination of mechanical alloying and spark plasma sintering [31].…”

Section: Resultssupporting

confidence: 71%

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

et al. 2019

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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.

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Section: Resultssupporting

confidence: 71%

“…Mechanically alloyed powders were consolidated by spark plasma sintering (FCT Systeme GmbH, Rauenstein, Germany) under the pressure of 80 MPa and the temperature of 1100 °C for 15 min. The applied heating rate and cooling rates were 100 and 50 °C/min, respectively [31].…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2019

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“…However, Si is known to be a highly promising alloying element in improving elevated temperature strength of Ti–Al alloy systems [ 38 , 114 ]. This is due to the Ti 5 Si 3 -phase (ζ-silicide; HCP structure) formed that acts as a strengthening phase for composites’ reinforcement based on TiAl intermetallic alloys [ 115 ]. Silicide (ζ-Ti 5 Si 3 ) is an intermediate phase that has considerable stiffness with superb oxidation and corrosion resistance [ 38 ].…”

Section: Characteristic Effects Of Silicon Additions In Tial Alloysmentioning

confidence: 99%

“…In a related study by Knaislova et al. [ 115 ], phase composition, microstructure and hardness of Ti–Al–Si alloy fabricated through MA + SPS were examined. After compaction, the alloy (TiAl15Si15) contained uniform microstructure of small quantity of TiAl 2 and Ti 5 Si 3 in TiAl-matrix.…”

Section: Characteristic Effects Of Silicon Additions In Tial Alloysmentioning

confidence: 99%

“…Nevertheless, the manufacturing of these alloys is still problematic. Melting metallurgy is confronted with the issue of high reactivity of melt with melting crucibles, high melting points of intermetallic phases, exothermic reactions during intermetallic phase formation and cracks and pores formation [ 115 ]. All these difficulties associated with wrought processing motivated researchers to study additive manufacturing (AM) technology for producing TiAl-based alloy products [ 11 , 14 , 30 , 31 , 101 , 121 ].…”

Section: Applications and Future Outlookmentioning

confidence: 99%

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Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

Raji

Popoola

Pityana

2020

Heliyon

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The high strength-to-weight ratio property of titanium aluminide (TiAl) based intermetallic alloys makes researchers regard this type of material as a potential replacement for the heavier superalloys of nickel. These alloys have been applied as turbocharger wheels of automobile and turbine blades of aircraft engines. A much recent alloy type of TiAl called the TNM alloy has emerged and primarily amenable to mechanical working; while providing the best combinations of mechanical properties that could be achieved through manufacturing processes with subsequent heat treatments. This is attained by solidifying entirely through the disordered β-phase (A2 structure). Effects of major alloying elements such as strength improvement, microstructural stability and phase formation demand the understanding of these alloying elements addition in TiAl-based intermetallic alloys. This review paper aims at encapsulating several works regarding the effects of major alloying elements on β-solidifying TiAl-based alloys and summarizing the characteristic effects of Si for these types of alloys. An impetus for future works on these types of intermetallic TiAl-based alloys is also presented.

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