Effect of reactive sintering conditions on microstructure of<i>in situ</i>titanium aluminide and silicide composites

Novák, Pavel; Popela, T.; Kubásek, Jiří; Šerák, Jan; Vojtěch, Dalibor; Michalcová, Alena

doi:10.1179/174329009x409651

Cited by 18 publications

(20 citation statements)

References 17 publications

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“…1a). Similar behaviour was observed in Ti-Al-Si alloys [9]. Samples reactively sintered in both argon atmosphere and in air achieve lower porosity (approximately 12 vol.%).…”

Section: Resultssupporting

confidence: 75%

“…However, the structure consisted of Al 2 Fe 3 Si 3 particles in Al 2 FeSi matrix was found in all samples prepared by reactive sintering at 750-1000 • C. During heating with higher rate, strongly exothermal reaction (1) probably produces sufficient amount of heat to activate the reaction (2) without the need of additional heating. Similar behaviour was observed in Ti-Al-Si alloys [9].…”

Section: Resultssupporting

confidence: 73%

“…In this system, only one exothermal reaction connected with the formation of FeAl phase was identified by DTA [5]. In Ti-Al-Si alloys with two exothermal peaks at similar temperatures, the same dependence on heating rate as in Fe-Al-Si alloys was identified [9]. Enthalpies of the formation of intermediary phases ( Table 2) were also estimated from the DTA heating curve for both heating rates presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Effect of reactive sintering conditions on microstructure of Fe–Al–Si alloys

Novák

Michalcová

Voděrová

et al. 2010

Journal of Alloys and Compounds

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“…1a). Similar behaviour was observed in Ti-Al-Si alloys [9]. Samples reactively sintered in both argon atmosphere and in air achieve lower porosity (approximately 12 vol.%).…”

Section: Resultssupporting

confidence: 75%

Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of reactive sintering conditions on microstructure of Fe–Al–Si alloys

Novák

Michalcová

Voděrová

et al. 2010

Journal of Alloys and Compounds

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“…However, some dependences seem to be general. In our previous works it has been found that the microstructure and porosity is positively aected by the increase of the heating rate in both FeAl Si and TiAlSi systems [2,3]. The set of SHS parameters leading to homogeneous low-porosity TiAlSi alloys is protected by Czech patent [4].…”

Section: Proceedings Of the International Symposium On Physics Of Matmentioning

confidence: 99%

Effect of Heating Rate on the Formation of Intermetallics during SHS Process

et al. 2015

Self Cite

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Self-propagating high-temperature synthesis is a simple and ecient method for the synthesis of various compounds including ceramics and intermetallics. In this process, the compressed mixture of elemental or master alloy powders is ignited or heated to initiate the exothermic reactions leading to the formation of desired compounds. In order to control the process eciently, the eect of several important parameters has to be determined in each applied alloy system. Previous results showed that those parameters are: initiation temperature, process duration, pressure used for compression and heating rate. This paper is devoted to the description and explanation of the eect of the heating rate on the formation of intermetallics during self-propagating high-temperature synthesis in FeAl and NiTi systems. Dierential thermal analysis of compressed powder mixtures under various heating conditions and microstructure observation of samples prepared by various heating rates using electric resistance heating and spark plasma sintering were carried out. The eect of heating rates on the formations of intermetallics in studied systems is discussed in this paper.

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“…Simple production route leading to the fine structure is a reactive sintering powder metallurgy. In our previous works [5], [6], production route for Ti-Al-Si alloys with aluminium content between 8 and 20 wt. % and silicon in the range of 10-20 wt.…”

mentioning

confidence: 99%

EFFECT OF ALLOYING ELEMENTS ON PROPERTIES OF PM Ti-Al-Si ALLOYS

Novák¹,

Kříž²,

Michalcová³

et al. 2013

Acta Metall Slovaca

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This work was devoted to the description of the effect of alloying by transition metals (Cr, Cu, Fe) on the structure and properties of TiAl15Si15 alloy. Alloying elements does not form separate phases, being dissolved in titanium silicide or aluminide. Cu was found predominantly in aluminide phase, while iron was found to bethe silicide-former. Chromium dissolved in both aluminide and silicide in almost comparable amounts. All applied alloying elements increased the wear resistance, but reduced the room-temperature compression strength. The addition of iron and chromium strongly increase the thermal stability at 1000°C by stabilizing the silicide phase.Keywords: reactive sintering; mechanical properties testing; intermetallic compounds; oxidation 1 Introduction Alloys based on titanium aluminides (Ti 3 Al and TiAl) are modern materials for hightemperature applications. Due to low density, good mechanical properties and oxidation resistance at high temperatures, these alloys already found its application in the aerospace industry. The application limits of Ti 3 Al phase are 760°C in inert atmosphere (creep limit) and approx. 600°C in air (oxidation limit) [1]. Application range of TiAl phase is 750°C in air and approx. 900°C in inert atmosphere or vacuum [1]. It shows that the temperature range of application of all Ti-Al phases is strongly limited by their high-temperature oxidation. To improve the high-temperature oxidation behaviour of these materials, additions of various alloying elements are applied. Previously, it was reported that niobium and tantalum increase the high-temperature oxidation resistance [2] and creep behaviour [3] of Ti-Al alloys. It led to the development of new generation of Ti-Al alloys [4]. However these heavy and expensive elements undesirably increase the density and cost. Other possibility how to improve hightemperature behaviour is alloying with silicon. When Ti-Al-Si alloys are produced by conventional melting metallurgy techniques, coarse sharp-edged particles of Ti 5 Si 3 silicide are formed, having negative impact on mechanical properties such as ductility or fracture toughness. Simple production route leading to the fine structure is a reactive sintering powder metallurgy. In our previous works [5], [6], production route for Ti-Al-Si alloys with aluminium content between 8 and 20 wt. % and silicon in the range of 10-20 wt. % was developed and roomtemperature properties were described [5]. There are many papers dealing with the influence of various alloying elements on the structure and selected properties of Ti-Al and Ti-Si binary alloys. In addition to the effect of Nb and Ta,

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Effect of reactive sintering conditions on microstructure ofin situtitanium aluminide and silicide composites

Cited by 18 publications

References 17 publications

Effect of reactive sintering conditions on microstructure of Fe–Al–Si alloys

Effect of reactive sintering conditions on microstructure of Fe–Al–Si alloys

Effect of Heating Rate on the Formation of Intermetallics during SHS Process

EFFECT OF ALLOYING ELEMENTS ON PROPERTIES OF PM Ti-Al-Si ALLOYS

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