Aluminium Alloy Addition Effects on the Behaviour of Soft Magnetic Materials at Low Frequencies

Bidulský, Róbert; Bidulská, Jana; Grande, Marco Actis; Ferraris, Luca

doi:10.12776/ams.v20i3.351

Cited by 23 publications

(22 citation statements)

References 8 publications

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“…Several authors [46][47][48] present suggestions for correlation of wear behaviour with the surface topography. The fact that surface wear is influenced by sub-surface deformation [49][50][51][52][53][54] was also effectively used to show the occurrence of delamination and fracture of material resulting in its removal.…”

Section: Study Of Tribological Propertiesmentioning

confidence: 99%

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

Kvačkaj¹,

Kováčová²,

Bidulská³

et al. 2015

Archives of Metallurgy and Materials

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In this study, static, dynamic and tribological properties of ultrafine-grained (UFG) oxygen-free high thermal conductivity (OFHC) copper were investigated in detail. In order to evaluate the mechanical behaviour at different strain rates, OFHC copper was tested using two devices resulting in static and dynamic regimes. Moreover, the copper was subjected to two different processing methods, which made possible to study the influence of structure. The study of strain rate and microstructure was focused on progress in the mechanical properties after tensile tests. It was found that the strain rate is an important parameter affecting mechanical properties of copper. The ultimate tensile strength increased with the strain rate increasing and this effect was more visible at high strain rates (ε ∼10 2 s −1 ). However, the reduction of area had a different progress depending on microstructural features of materials (coarse-grained vs. ultrafine-grained structure) and introduced strain rate conditions during plastic deformation (static vs. dynamic regime). The wear behaviour of copper was investigated through pin-on-disk tests. The wear tracks examination showed that the delamination and the mild oxidational wears are the main wear mechanisms.Keywords: OFHC copper, UFG, ECAP, strain rate, fractography, wear resistance W pracy zbadano szczegółowo statyczne, dynamiczne i tribologiczne właściwości ultra drobnoziarnistej (UFG) beztlenowej miedzi o wysokiej przewodności cieplnej (OFHC). W celu oceny właściwości mechanicznych przy różnych szybkościach odkształcenia, miedź OFHC badano za pomocą dwóch urządzeń w warunkach statycznych i dynamicznych. Ponadto miedź poddano dwóm różnym sposobom przetwarzania, co umożliwiło badanie wpływu struktury. Badanie szybkości odkształcenia i mikrostruktury koncentrowało się na zmianie właściwości mechanicznych po próbie rozciągania. Stwierdzono, że szybkość odkształcania jest ważnym parametrem wpływającym na właściwości mechaniczne miedzi. Wytrzymałość na rozciąganie wzrosła ze wzrostem szybkości odkształcenia i ten efekt był bardziej widocznyprzy dużej szybkości odkształcania (ε ∼10 2 s −1 ). Jednak zmniejszenie obrazu przebiegało inaczej w zależności od cech mikrostruktury materiałów (struktura gruboziarnista a struktura ultra drobnoziarnista) i zadanych warunków szybkości odkształcenia podczas odkształcenia plastycznego (warunki statyczne a warunki dynamiczne). Zużycie miedzi badano za pomocą testów zarysowania. Badanie ścieżek zużycia wykazało, że delaminacja i umiarkowane utlenienie to główne mechanizmy zużycia.

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Section: Study Of Tribological Propertiesmentioning

confidence: 99%

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

Kvačkaj¹,

Kováčová²,

Bidulská³

et al. 2015

Archives of Metallurgy and Materials

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“…The improvement of wear resistance and hardness is probably connected with the refinement of the hard silicide particles by all alloying elements. Porosity and the pores geometry can also play important role in wear mechanism [16,17]. Sharp-edged isolated pores were reported act as stress concentrators, leading to the nucleation and propagation of microcracks.…”

Section: Experimental Materials and Conditionsmentioning

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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“…Some important parameters are the relative permeability, the coercivity, the saturation magnetization, and the electrical conductivity [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel

Kvačkaj

Bella²,

Bidulský

et al. 2017

Acta Phys. Pol. A

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The goal of the present work is to compare progressive technology -rolling at cryogenic temperature and classical rolling at ambient temperature followed by an investigation of their impact on the final microstructure and the magnetic properties of non-oriented electrical steel. Non-oriented electrical steel is characterized by high magnetic induction, low magnetic losses, and low coercivity. The best magnetic properties are achieved using preferable texture and optimal grain size. In this paper there is analyzed the percentage of different textural components after cryo-rolling and after rolling at ambient temperature. To obtain maps of inverse pole figures, the electron backscatter diffraction method was used. The main contribution of this study was that the samples rolled at cryo conditions and after final annealing reached better magnetic properties than at ambient temperature, which was reflected by low magnetic losses and coercivity.

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Aluminium Alloy Addition Effects on the Behaviour of Soft Magnetic Materials at Low Frequencies

Cited by 23 publications

References 8 publications

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

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

The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel

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