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The microstructural properties of explosion welded Ni/Ti joint

Zdrodowska K., Wojsyk K., Szala M.

Advances in Science and Technology. Research Journal

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2014

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Vol. 8, nr 22

71--74

EN

Explosion welding is one of the ways of bonding materials. This method is used to bond metals which either cannot be joined or they are difficult to bond by other methods. The study investigates the metallographic characteristics of Ni/Ti joints in the form of a plate. Microstructures of the joints are examined and hardness measurements are carried out on the bonded materials and their interfaces. A detailed analysis of the distributions of wave length and width is presented. An average microhardness of the interface is found to be higher than that of the base materials.

2

Properties of Fe73Ni5Y3B19 amorphous ribbon produced by melt-spinning

Zdrodowska K., Kwarciak P., Szota M., Nabiałek M.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

381--387

EN

Purpose: The purpose of the study is to examine the mechanical properties of Fe73Ni5Y3B19, alloy and to carry out the comparative examination of matt and glossy sides of those alloys. Design/methodology/approach: The Fe73Ni5Y3B19, alloy have been produced by the melt-spinning method which involves rapid cooling of the metal on a spinning copper cylinder. The cooling rate has required for obtaining the amorphous alloy ranges from 10 5 to 106 K/s. The above-mentioned method is popular and often used; however, in order to obtain alloys of amorphous structure, it should be assured that the conditions for obtaining amorphous materials, as set by A. Inoe, are satisfied. Findings: Mechanical properties, such as microhardness, roughness, abrasive wear with the use of a ball tester, have been described and the X-ray diffraction has been determined in the paper. Research limitations/implications: Analyzed modernization of the machine refers to pin on disc, disc-disc, block and disc unit sliding friction processes. Practical implications:The Fe73Ni5Y3B19 amorphous alloys find the application in the power industry, where they are used for transformer cores.

3

Thin-layered amorphous Fe73Co5Y3B19 strip produced by the melt-spinning method

Zdrodowska K., Kwarciak P., Jędryka J., Szota M., Nabiałek M.

Inżynieria Materiałowa

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2013

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Vol. 34, nr 4

401--404

EN

The purpose of the study was make thin-layered amorphous Fe73Co5Y3B19 strips and examine their mechanical properties. Amorphous alloys were made by the melt-spinning method, which consists in rapid cooling of the metal on a spinning copper cylinder. The cooling rate required for obtaining the amorphous alloy ranges from 105 to 106 K/s. In the paper results of metallographic examinations, microhardness tests, tribological resistance tests using a ball tester, surface roughness proﬁle examinations, as well as an X-ray analysis are presented. All examinations and tests were done for both side of the tape. The mat side of tape is formed on the drum and its properties differ from the glossy side. Interesting are the results of the balltester tribological resistance tests, where a difference in abrasion between the both material sides is visible. The lesser abrasions on the glossy side are caused by a surface layer that occurs there. In contrast, the abrasions on the mat side are relatively greater. It can be claimed that the differences in the examined properties between the mat and the glossy side of the amorphous Fe73Co5Y3B19 alloy occur as a results of different cooling conditions. This is directly associated with the production method.

PL

Celem pracy było wytworzenie cienkowarstwowych amorﬁcznych taśm stopu Fe73Co5Y3B19 i badanie ich właściwości mechanicznych. Amorﬁczne stopy były wykonane metodą zestalenia ciekłego stopu, która polega na szybkim chłodzeniu metalu na wirującym miedzianym bębnie. Wymagana szybkość chłodzenia w celu uzyskania stopów amorﬁcznych wynosi od 105 do 106 K/s. W artykule przedstawiono przeprowadzone badania metalograﬁczne, badania mikrotwardości, próby tribologiczne za pomocą kulotestera, pomiary chropowatości powierzchni proﬁlu, jak również analizę rentgenowską. Wszystkie badania i próby zostały wykonane dla każdej strony taśmy. Strona matowa taśmy powstaje na powierzchni bębna, a jej właściwości mechaniczne znacząco różnią się od właściwości strony błyszczącej. Interesujące są wyniki badań właściwości tribologicznych, w których różnica w ścieraniu między stronami materiału jest widoczna. Mniejsze wytarcia na błyszczącej stronie są spowodowane przez warstwę powierzchniową. W przeciwieństwie do tego, wytarcia na stronie matowej są głębsze. Można stwierdzić, że różnice w badanych właściwościach między matową i błyszczącą stroną amorﬁcznego stopu Fe73Co5Y3B19 występują w wyniku różnych warunków chłodzenia. Jest to bezpośrednio związane ze sposobem wytworzenia materiału.

4

The surface structural and mechanical properties of the amorphous CO22Y54AL24 ribbon

Bukowska A., Pietrusiewicz P., Zdrodowska K., Szota M.

Advances in Science and Technology. Research Journal

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2013

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Vol. 7, nr 19

1--4

EN

The aim of this study was to manufacture amorphous Co22Y54Al24 alloy in a form of thin ribbons and to investigate their properties. The investigated ribbons were prepared by rapid solidification of molten metal on a rotating copper cylinder (melt-spinning). In order to obtain the material with amorphous structure, the cooling rate of the liquid alloy should vary in a range from 104 to 106 K/s. The microstructure studies were performed using X-ray diffractometery. The mechanical properties were investigated by metallographic studies, micro-hardness and tribological resistance tests moreover the surface roughness profile were analyzed. All studies were performed for two sides of tapes, since the differences in ribbons surface, related with manufacturing process, are clearly visible. The surface from the bottom (drum side) was glossy and from the top side it was shiny.