Study of Phase Transformation in Alloys of the Al-Fe System

Jabłońska, Magdalena; Mikuśkiewicz, Marta; Śmiglewicz, A.; Bernstock-Kopaczyńska, E.

doi:10.4028/www.scientific.net/ddf.326-328.573

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…As it is commented by the author of [16], it indicates the presence of a second-order transition between β and γ. Additional confirmation for this assumption can be the presence of thermal effect occuring also during cooling (570°C) that shows good compatibility with order-disorder transition observed in alloys from Ni-Al-Cr or Fe-Al systems [17][18][19][20].…”

Section: Methodsmentioning

confidence: 65%

Thermal and structural analysis of high-tin bronze of chemical composition corresponding to the composition of the singing bowl

Jabłońska

Maciąg

Nowak

et al. 2019

J Therm Anal Calorim

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Technical copper alloys with tin are commonly named bronzes. Modern tin bronzes used in industry contain between 1 and 9 at.% of tin. Those alloys are used mostly for mechanical working. An increase in tin content in bronzes cooled in standard conditions results with appearance next to heterogeneous structure α and also other structures, including adverse phase δ. In ancient times, bronzes with tin content up to 14 at.% were used in order to manufacture ornaments or items used for everyday life such as singing bowl. An analysis of discussed bowl structure indicated dominant b 0 1 and c 0 1 martensite phase, which is an evidence of quenching in order to preserve the high-temperature β and γ phase structure. The main goal of this work was to obtain high-tin bronze structure corresponding to phases identified in singing bowl. On the basis of chemical composition and structural analysis of the singing bowl, a binary technical alloy was prepared by induction melting process. On such prepared alloy, a differential thermal analysis was performed in order to determine the presence of phase transitions. Based on results of thermal analysis, the temperature ranges and cooling conditions of heat treatment were investigated in order to perform structural analysis. Additionally, the structure of the alloy was analyzed in context to achieve a similar martensite phase as a matrix with α secondary phase.

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Section: Methodsmentioning

confidence: 65%

Thermal and structural analysis of high-tin bronze of chemical composition corresponding to the composition of the singing bowl

Jabłońska

Maciąg

Nowak

et al. 2019

J Therm Anal Calorim

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“…The work rolls with diameter of 67 mm rotated at the speed from 40 to 150 rpm. After heating to the rolling temperature (ranging from 1160 to 1240 °C), which corresponds to a range ordering decline [14] the material was rolled flatways to 1/3 of the thickness, using the relatively heavy height reductions (approx. 11 -12 -14 -16 -19 -19 -19 %).…”

Section: Methodsmentioning

confidence: 99%

Optimization Of Laboratory Hot Rolling Of Brittle Fe-40at.%Al-Zr-B Aluminide

Schindler

Hadasik

Kopeček

et al. 2015

Archives of Metallurgy and Materials

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Use of the protective steel capsules enabled to manage the laboratory hot flat rolling of the extremely brittle as-cast aluminide Fe-40at.%Al-Zr-B with the total height reduction of almost 70 %. The hot rolling parameters were optimized to obtain the best combination of deformation temperature (from 1160°C up to 1240°C) and rolling speed (from 0.14 m·s−1 to 0.53 m·s−1). The resistance against cracking and refinement of the highly heterogeneous cast microstructure were the main criteria. Both experiments and mathematical simulations based on FEM demonstrated that it is not possible to exploit enhanced plasticity of the investigated alloy at low strain rates in the hot rolling process. The heat flux from the sample to the working rolls is so intensive at low rolling speed that even the protective capsule does not prevent massive appearance of the surface transverse cracking. The homogeneity and size of product’s grain was influenced significantly by temperature of deformation, whereas the effect of rolling speed was relatively negligible. The optimal forming parameters were found as rolling temperature 1200°C and the rolling speed 0.35 m·s−1. The effective technology of the iron aluminide Fe-40at.% Al-Zr-B preparation by simple processes of melting, casting and hot rolling was thus established and optimized.

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“…In addition, the effect of the ordering process seems to be an important factor as well. According to the phase equilibrium system [19] and results of own studies [20], the annealing was carried out in field of ordered solid solution of DO 3 type, where the ordering process may have dominance over the vacancy eliminated process. After low-temperature annealing for Fe-28Al, formation of dislocation networks has been observed, exposure of which evidences a tendency to lower free energy, connected with the ordering process.…”

Section: Applied Crystallography XXIImentioning

confidence: 99%

Study of Defects Structure in Fe-Al Alloys

Bernstock-Kopaczyńska

Jabłońska

2013

SSP

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In the literature it is proven that thermal vacancies have a great influence on the mechanism of hardening of Fe-Al alloys. Moreover, in these alloys, we observed a long-range ordering, which can significantly affect the mechanical and physical properties and their stability. In this paper, influence of low-temperature annealing on elimination of excess vacancies was investigated. TEM observation of annealed specimens for the alloys with 28 and 38 at.% aluminum have helped elucidate the phenomena responsible for vacancies elimination due to the occurrence of particular interactions between point and linear structure defects. It was shown that the aluminum content influences significantly changes in defects structure. The alloy with 28 at.% aluminum has mainly superdislocations in the structure, while in alloy with 38 at.% aluminum, mainly unit dislocations and high-energy dislocation configurations, like dislocation loops, dislocation dipoles, and dislocation jogs, were observed. The results suggest that different defect types may control the diffusion process during low-temperature annealing and that it is affected by alloy composition.

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Study of Phase Transformation in Alloys of the Al-Fe System

Cited by 9 publications

References 6 publications

Thermal and structural analysis of high-tin bronze of chemical composition corresponding to the composition of the singing bowl

Thermal and structural analysis of high-tin bronze of chemical composition corresponding to the composition of the singing bowl

Optimization Of Laboratory Hot Rolling Of Brittle Fe-40at.%Al-Zr-B Aluminide

Study of Defects Structure in Fe-Al Alloys

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