Crystallization studies on Te-Ge amorphous alloys

Oleszak, D.; Dąbrowski, B.; Matyja, H.

doi:10.1007/bf01730046

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…This crystallization behavior of amorphous alloys by MA/MM is not well understood. It has also been reported that a crystalline u phase formed on milling beyond the amorphous phase in Ti-AI 'alloys [75]. This has been, however, suggested to be due to interstitial contamination of the powder [431 (see below).…”

Section: Solid-state Amorphizationmentioning

confidence: 96%

Recent advances in the synthesis of alloy phases by mechanical alloying/milling

Suryanarayana

1996

Metals and Materials

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Mechanical alloying (MA) is a solid-state powder processing technique involving repeated welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Originally developed to produce oxidedispersion strengthened nickel-and iron-base superalloys, MA has now been shown to be capable of synthesizing a number of alloy phases-equilibrium and supersaturated solid solutions, stable and melastable crystalline and quasicrystalline intermediate phases, and amorphous alloys. Recent advances in these areas and also on disordering of ordered intermetallics and displacement reactions have been critically reviewed. Wherever possible, comparisons have been made on the product phases obt~tined by MA and by rapid .solidification processing, another non-equilibrium processing technique.

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Section: Solid-state Amorphizationmentioning

confidence: 96%

Recent advances in the synthesis of alloy phases by mechanical alloying/milling

Suryanarayana

1996

Metals and Materials

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“…For example, Yang et al (2000) reported an amorphous phase formation while Oehring and Bormann (1991) reported that MA of the powder mixture led to synthesis of Ti 5 Si 3 intermetallic compound. Also Oleszak et al (1993) reported that during MA of Ti 62•5 Si 37•5 powder mixture, initially an intermetallic compound and then an amorphous phase was formed. From this standpoint, a thermodynamic analysis could help to predict the more stable phase and compare the stability of phases in Ti-Si binary system.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic aspects of nanostructured Ti5Si3 formation during mechanical alloying and its characterization

2012

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Mechanical alloying (MA) was used to produce Ti 5 Si 3 intermetallic compound with nanocrystalline structure from elemental powders. The structural changes and characterization of powder particles during milling were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size analyser (PSA) and microhardness measurements. MA resulted in gradual formation of disordered Ti 5 Si 3 intermetallic compound with crystallite size of about 15 nm after 45 h of milling. Also a thermodynamic analysis of the process was carried out using Miedema model. The results showed that in the nominal composition of Ti 5 Si 3 intermetallic phase (X Si = 0•375), formation of an intermetallic compound has the lowest Gibbs free energy rather than solid solution or amorphous phases. So the MA product is the most stable phase in nominal composition of Ti 5 Si 3. This intermetallic compound exhibits high microhardness value of about 1235 HV.

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“…[33] This technique has been used to synthesize equilibrium and non-equilibrium materials, such as amorphous alloys, [34] nanocrystalline materials, [35] intermetallic compounds, [36] and supersaturated solid solution. [37] Although MA techniques have been applied to the Ti-Si system, [38][39][40][41][42][43] there are very few reports of the same with Ti-rich Si alloys (Ti > 92 wt pct). Notably, our research group recently established that the MA process promotes the formation of a supersaturated a-Ti-Si solid solution in a Ti-2 wt pct Si system.…”

Section: Introductionmentioning

confidence: 99%

Powder Metallurgy Production of Ti-2 Wt Pct Si Alloy: Structural, Mechanical, and Electrochemical Characterization of the Sintered Material

Guzmán

Muranda

Soliz

et al. 2020

Metall Mater Trans A

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Several commercial alloys use silicon (Si) to improve titanium (Ti) resistance to creep and oxidation at high temperatures and to improve Ti corrosion resistance in acid media. According to the Ti-Si phase diagram, reported stable solid phases in the Ti-rich region are b-Ti, a-Ti, Ti 3 Si, and Ti 5 Si 3. Nevertheless, very few works in the literature discuss Ti 3 Si intermetallic production. As such, this work studied the possibility of obtaining an a-Ti-Ti 3 Si alloy by hot pressing a-Ti supersaturated solid solution powders obtained by mechanical alloying. The consolidation of milled powders was performed using uniaxial hot press equipment. Structural and morphological evolutions during the sintering process were investigated by X-ray diffraction and scanning electron microscopy. Electrochemical behaviors of sintered samples were evaluated by open circuit potential and linear sweep voltammetry. Results show a fine and uniform Ti 3 Si alloy distribution in the a-Ti matrix produced by the proposed powder metallurgy route. The sintered samples demonstrated high micro-hardness and resistance to sulfuric acid corrosion. Additionally, Ti 3 Si was shown to have a significant hardening effect on the a-Ti matrix. Electrochemical behavior further demonstrates that a fine and homogeneous Ti 3 Si distribution in the a-Ti matrix contributes to a more stable superficial oxide layer against sulfuric acid corrosion.

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Crystallization studies on Te-Ge amorphous alloys

Cited by 5 publications

References 10 publications

Recent advances in the synthesis of alloy phases by mechanical alloying/milling

Recent advances in the synthesis of alloy phases by mechanical alloying/milling

Thermodynamic aspects of nanostructured Ti5Si3 formation during mechanical alloying and its characterization

Powder Metallurgy Production of Ti-2 Wt Pct Si Alloy: Structural, Mechanical, and Electrochemical Characterization of the Sintered Material

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