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Wyniki 1-10 spośród 13 dla zapytania: authorDesc:"JAN DUTKIEWICZ"

» Struktura mielonych proszków z układów TiAl-X (X = V, Cr) oraz NiAl-X (X = Fe, Cr). Struktura stopu TiAl-V po mieleniu i prasowaniu na gorąco

JAN DUTKIEWICZ

WOJCIECH MAZIARZ

Stopy na osnowie faz międzymetalicznych y-TiAl i /?-NiAl są ogólnie znane jako atrakcyjne materiały do zastosowań w przemyśle lotniczym i motoryzacyjnym ze względu na ich niską gęstość, wysoką wytrzym[...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2004/6

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» Struktura i właściwości połączeń kształtowników stopu 2017A spajanych metodą zgrzewania tarciowego FSW

KRZYSZTOF MROCZKA

ADAM PIETRAS

JAN DUTKIEWICZ

W artykule przestawiono wyniki badań strukturalnych oraz mikrotwardości połączeń kształtowników stopu 2017A wykonanych metodą zgrzewania tarciowego, zwną też Friction Stir Welding. Materiał zgrzewany [...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2006/3

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» Characterization of friction stir welds of 6013 and 6013/2017A aluminium alloy sheets

Krzysztof Mroczka

Jan Dutkiewicz

Adam Pietras

The Friction Stir Welding (FSW) takes place due to rotation and movement of FSW tool. A tool moves the welded materials along its edges. As a result of the FSW process good quality of a weld is obtained below the melting point. The FSW weld consists of particular zones: the weld nugget (area in the centre), thermomechanically affected zone and heat affected zone. The weld nugget is frequently surrounded by rings known as an onion microstructure (rings) especially within the FSW welds of the aluminium alloys of 6XXX series. The microstructure and properties of the particular zones depend strongly on the welding parameters [1] and the type of the welding tool pin and shoulder. For example, a grain size within the weld nugget was found to depend strongly on the linear velocity of the tool [2]. The various studies of the aluminium alloys that underwent friction stir welding show various dislocation densities within welds’ nuggets [3]. The hardness in the region of the weld can change in many ways [4, 5]. The welds formed by FSW between the aluminium alloy sheets and especially between the 6XXX series alloys are much better than those formed by a high-temperature welding methods like Gas Metal Arc Welding especially due to lower temperature of welding [6]. The FSW technology is applied presently for welding of the aluminium and magnesium alloys as well as copper, steel, composites and dissimilar materials [7÷10]. The alloys of the 6XXX series are often applied in the constructions and transportation industry. The 6013 aluminium alloy has broad application in the production of many car parts like vehicle structure, wheels, panels and others [11]. The mentioned alloy can be welded by the means of the FSW method similarly as other alloys of the 6XXX series [11, 12]. Uzun et al. [13] signaled the possibility of welding the alloy with steel. Therefore, the aim of the paper was to analyze the microstructures and properties of the [...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2010/3

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» Structure, thermal and magnetic properties of ferromagnetic Co-Ni-Al alloys

Wojciech Maziarz

Jan dutkiewicz

Aleksandra kolano-burian

Ritta szymczak

Ferromagnetic shape memory alloys (FSMAs) are being intensively studied because of their potential applications as smart materials. Martensitic transformations and lattice reorientation processes in FSMAs can be triggered not only by changes in temperature and stress, as in conventional SMAs, but also by applying an external magnetic field. The martensitic phase transformation of the ferromagnetic Co-Ni-Al alloy systems has been studied in several papers [1÷5]. The Curie and the martensitic transition temperatures of the β phase increase and decrease with increasing the Co content, respectively. The shape memory effect proceeds due to the thermoelastic martensitic transformation from the B2 parent phase into the martensite phase with L10 structure. The unique properties of the Co-Ni-Al alloy system is an improved ductility allowing hot rolling and cold rolling of a presence of γ phase with fcc structure. The β single-phase polycrystalline alloys show a poor ductility [2]. It has been reported that the hot fabricability of NiAl-based alloys could be improved by the introduction of γ phase [6, 7]. Since the composition range of β phase exhibiting the FSM is located near the β + γ two-phase region, the β-based alloys are able to introduce the γ phase by suitable choice of composition and heat treatment temperature [1, 2]. Several percent of γ phase significantly improves the ductility of the Co-Ni-Al two-phase alloys, which is of great advantage for practical applications [8]. Compounds with a strong coupling between crystallographic structure and magnetism usually exhibit a magnetic field dependence of the structural transitions. A typical example is the Gd5(SixGe1-x)4 alloys (0.24 ≤ x ≤ 0.5), where a transformation from the paramagnetic monoclinic phase to the ferromagnetic orthorhombic phase can be induced either by cooling or by the application of a magnetic field [9[...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2010/3

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» The role of ECAP in densification behaviour of PM aluminium alloy

JANA BIDULSKÁ

Róbert Kočiško

Andrea Ková čová

Jan Dutkiewicz

Powder metallurgy (PM) of aluminium alloys are used in a variety of industrial applications, such as the transportation (automotive and aerospace), and commercial areas. Light weight aluminium alloys, showing excellent workability, high thermal and electrical conductivity, represent a good choice for the PM industry to produce new materials with unique capabilities, not currently available in any other powder metal parts. Moreover, the requirement on mechanical properties (i.e. high tensile strength with adequate plasticity) should assure an increasing role for aluminium alloys in the expanding PM market. Due to their unique mechanical and physical properties, aluminium PM alloy parts are advantageous in engineering applications because of higher possibilities in material selection and design. Therefore, application of PM products is possible only if the designer understands the deformation characteristics of the virgin material. On the other hand, due to the presence of porosity in the aluminium PM parts, the deformation behaviour of the PM parts is considerably different from the conventional cast and wrought materials. It has already been extensively demonstrated that the mechanical and tribological properties of PM materials are directly controlled by their density and microstructure [1÷3]. Therefore a boost up in the application of PM materials could be derived from a complete knowledge of the mutual relationship between density (and/or porosity), composition and microstructure. Conventional PM method (press-and-sinter) is still most used process in PM production, mainly due to its cost effective properties. The process of powder pressing depends on a number of factors, such as the rheology (flow properties of powders during process), stress distribution within compacts and across particle-toparticle, hardness of particles (with respect the work hardening), strength distribution of particles, lubricant type and place of d[...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2011/2

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» Ball milling of Al-based alloys to obtain amorphous-nanocrystalline structure

Agata Kukuła

Lidia Lityńska -Dobrzyńska

Anna Góral

Jan Dutkiewicz

Considering a high strength to weight ratio of Al-based alloys as well as outstanding properties of metallic materials in a glassy state, amorphous aluminum alloys have attracted considerable attention due to their potential in structural applications for transportation and aviation industry[1÷8]. Metastable phases in amorphous or quasicrystalline state can induce two to three times higher strength as compared with those processed through precipitation/age-hardening in crystalline Al‑alloys [1, 2]. The first formation of amorphous single phase in Al‑based alloys containing more than 50 at. % Al was found in 1981 for Al-Fe-B and Al-Co-B ternary alloys [1], but they were very brittle and hence have not attracted much attention. Since then, glass forming ability has been determined in a number of Al-based alloys consisting of Al + transition metal + rare-earth elements, processed mainly by rapid solidification or gas atomization methods [8]. It has been also found that ductility in aluminum alloys can be improved when a few nanometer size crystals are embedded in the amorphous matrix [7]. Choi et al. [9] reported tensile fracture strength as large as 1980 MPa for an amorphous alloy containing about 18% Al nanocrystals - this strength was nearly 1.6 times higher than for the fully amorphous alloy. Later, Kawamura et al. [3] attained a bulk compressive strength of 1420 MPa by hot compaction of gas-atomized amorphous Al85Ni5Y8Co2 powder with nanocrystalline dispersed amorphous matrix. Among many techniques of synthesizing novel materials including nanocrystalline or amorphous products there are melt spinning, gas atomization and similar rapid quenching methods [2] but mechanical alloying (MA) by high-energy ball milling is a convenient solid state synthesis alternative for them. It gives the opportunity of obtaining various phases in the material without need to melt pure elements of the alloy. Furthermore, in the one pro[...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2011/2

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» Massive amorphous CuZrTiAg alloy processed by ball milling and hot pressing

JAN DUTKIEWICZ

Cu50Ag10Zr30Ti10 alloy well known as a good glass former has been ball milled for 40 hours starting from pure elements. Changes of particle’s size and crystallographic structure during milling has been determined. The particles first grow, then decrease after 40 hours of milling, when powders possess amorphous structure. The transmission electron microscopy TEM studies of powders allowe[...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2007/3-4

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» Ball milling amorphization and consolidation of NiTiZrNb and NiNbTiZrCoCu alloys

Jan Dutkiewicz

Lidia Lityńska-Dobrzyńska

Amorphous nickel rich alloys have been obtained in recent years by rapid quenching from the liquid state or by mechanical alloying in a planetary mill [1÷9]. One advantage of the latter method is that it makes it possible to obtain new materials from powders of different elements, which are immiscible in the liquid state. Binary NiTi alloys subjected to ball milling or severe plastic deformation can be obtained amorphous [1÷3]. The tendency to form an amorphous structure depends on the relative values of the deformation temperature and martensite start (Ms) temperature. Lowering of the deformation temperature in the range below the martensite finish temperature facilitates amorphization [3]. Mechanical alloying of Ni60Nb20Zr20 alloy [4] involves two consecutive amorphization reactions, leading first to the amorphization reaction between Ni and Zr layers and on further milling consequently a Ni-Nb amorphous phase forms. The resulting two amorphous phases homogenize at longer milling times. Multicomponent nickel base alloys can be obtained as bulk glass at composition of Ni50Co10Nb20Ti10Zr10 (at. %) alloys with reported large supercooled liquid region of more than 40 K formed by copper-mold casting. The alloys with 5 and 10 at. % cobalt possess the highest glass-forming ability [5]. Mechanically alloyed Ni57Zr20Ti18Al5 alloy powders synthesized by high-energy ball milling have shown a complete amorphization after 5 h of milling, even broader supercooled region of 56°C and crystallization temperature above 500°C [6]. Substitution of aluminum by silicon [7] also allowed to obtain amorphous Ni57Zr20Ti20Si3 powders by mechanical alloying of pure Ni, Zr, Ti, Si, and ceramic powder mixture; the metallic alloy amorphized after 5 hours milling indicating a good glass forming ability. In [8] Amorphous Ni59Zr20Ti16Sn5 alloys were fabricated by melt spinning and by mechanical alloying (MA) techniques. Differences in crystallization temperat[...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2010/3

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» Microstructure and properties of ball milled and hot compacted powder of 7055 aluminium alloy

Lidia Lityńska-Dobrzyńska

7xxx series (Al-Zn-Mg-Cu) aluminum alloys are widely used in the aircraft industry due to their low density, high strength and good workability [1, 2]. Their strengthening increases with the concentration of Zn and is associated with higher density of very fine precipitates of metastable η′-phase enriched with Zn and Mg. The high solute (about 8 wt. % of Zn) alloy designated AA 7055 (ALCOA) evokes the highest strength aluminium alloys produced by ingot metallurgy and is applied as upper wing skin materials in commercial aircraft [3]. The 7055 composition processed using the T77 temper provides a microstructure at and near grain boundaries that is resistant to both intergranular fracture and interglanular corrosion. Aluminium based materials produced by powder metallurgy (PM) processing offer a number of interesting opportunities for high strength applications. Powder metallurgy enables to fabricate high quality parts close to final dimensions with refined microstructure as compared with these produced by the conventional ingot metallurgy [4, 5]. The ball milling applied before the compaction allows obtaining a very fine microstructure and the extension of the solid solubility limits of the elements added to the alloy [6]. It results in improved mechanical and corrosion properties of the compacted products. PM technology provides more homogenous distribution of the precipitates and reduces the particle size that makes corrosion more uniform [7]. The aim of the present investigation was to study the effect of ball milling and hot pressing on the microstructure and properties of milled and compacted 7055 aluminium alloy powder. Exp erimental details The mixtures of elemental powders of aluminum, zinc, magnesium, copper and zirconium were used as starting materials to yield (wt. %) Al - 8% Zn - 2% - Mg - 2.3% Cu - 0.2% Zr compositions corresponding to 7055 commercial aluminium alloy. The ball milling of the powder was [...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2010/3

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» CHARAKTERYSTYKA WIÓR ODPADOWYCH ZE STOPÓW ALUMINIUM I METODA WYTWARZANIA Z NICH PROSZKU I SPIEKÓW

JOANNA KARWAN-BACZEWSKA

W niniejszym artykule przedstawiono charakterystykę wiór aluminiowych pochodzących od jednego z producentów detali ze stopów aluminiowych, metody ich przeróbki dla uzyskania proszku oraz spieków. Materiały odpadowe w formie wiór aluminiowych poddano analizie składu chemicznego, składu ziarnowego i określeniu kształtu cząstek oraz badaniom wybranych własności technologicznych tj. gęstości nasypowej, gęstości nasypowej z usadem, sypkości, i zgęszczalności. Następnie wióra aluminiowe prasowano w zakresie ciśnień od 100 do 400 MPa i spiekano w piecu rurowym w temperaturach od 729 K(456 °C) do 801 K (528 °C) w czasie 30 min w atmosferze argonu. Ponadto część proszku prasowano na gorąco w próżni. Przeprowadzono badania gęstości, twardości i ilościowe charakterystyki porowatości spieków na bazie wiór aluminiowych. W celach porównawczych przedstawiono również charakterystykę granulek aluminiowych otrzymanych metodą rozpylania również pochodzących z recyklingu. Słowa kluczowe: materiały odpadowe, wióra aluminiowe, granulki aluminiowe, metalurgia proszków, proszki i spieki na osnowie aluminium CHARACTERISTICS OF WASTE METAL CHIPS FROM ALUMINUM ALLOYS AND A METHOD FOR MAKING POWDER AND SINTERS FROM THEM In the present paper composition and microstructure of aluminum alloys chips from production of aluminum alloy details, description of methods of powder preparation from chips and their sintering are presented. The chips were mechanically alloyed with aluminum powder to be further sintered. The chemical composition, distribution of particle size, the definition of particles shape and selected technological properties like: bulk density, tap density, flow and compressibility of powders were studied. Next, obtained aluminum alloy powders were compacted in the range of presses from 100 to 400 MPa and sintered in the tube furnace for 60 min in an argon gaseous envelope, at temperature from 729 K (456 °C) to 801 K Dr hab. inż. Joanna Karwan‐Baczews[...] więcej»
w zeszycie RUDY I METALE NIEŻELAZNE 2010/8

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