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Structure and properties of amorphous and nanocrystalline Fe78Si11-xB11Yx(x = 0 or 2) alloys produced in a single production step using controlled parameters melt-spinning method

100%

Błoch K.

tom Vol. 73, nr 1

5--12

Purpose: The paper presents results of structural and magnetic properties of Fe78Si11B11 and Fe78Si9B11Y2 alloys in the form of ribbons. The effect of addition of yttrium on the structure and magnetic properties was investigated. Design/methodology/approach: The investigated samples were prepared in the form of ribbons using the melt-spinning method. The material structures were investigated using X-ray diffractometry, Mössbauer spectroscopy and scanning electron microscopy. The magnetic properties were studied using using vibrating magnetometer. Findings: Samples were fabricated using rapid cooling at a rotating copper wheel. Images of fractures of investigated samples obtained by decohesion using same magnifications are similar. The distinct vein like structure or the husk structure are not visible thought they are typical of amorphous and nanocrystalline materials with a high degree of internal stress. Mössbauer spectrum is typical as for amorphous materials that are ferromagnetic. It consists of six lines forming a Zemman's sextet. The hyperfine induction field distribution obtained for this sample shows clearly separated two components: low- and high-field. After the introduction of 2% at. Y to the alloy Fe78Si11B11 in place of Si partial crystallization occurred. The shape of the initial magnetization curves is similar and corresponds to materials with low effective anisotropy. Originality/value: The paper presents some researches of the Fe-based bulk amorphous alloys obtained by the melt-spinning method.

Comparison of results obtained using the injection method of preparation of solid amorphous alloys with and without suction

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Klimas J. , Łukaszewicz A. , Szota M. , Nabiałek M. , Dobrzańska-Danikiewicz A.

2014

tom Vol. 67, nr 2

77--83

Purpose: The study compares the structure and properties titanium alloy Ti-6Al-4V produced by injection method allowing the production of massive amorphous materials in two varies – with and without suction. Design/methodology/approach: Samples were produced form titanium alloy Ti-6Al-4V produced by injection method. Structures and properties were compared of the same alloy but with different conditions in production process – with and without suction. To achieve the objective perused the following tests were carried out: study of phase composition by X-ray diffraction, observation of microstructure by using optical microscope and SEM, study of surface geometry – roughness, abrasion resistance tests and microhardness tests. Results: Microstructural studies have allowed to observe that the titanium alloy Ti-6Al-4V produced by injection method in both varies – with and without suction during injection to copper mold, has structure partially crystalized – nanocrystalline. In structure occur the crystal nuclei and lack of arrangement and regularity. The study of microhardness showed 100 HV 0.1 units higher hardness value in the embodiment with suction in comparison to the variant without suction. Titanium alloy Ti-6Al-4V produced with suction has better abrasion resistance in comparison with same alloy without suction. Alloy produced with suction has lower development area. Originality/value: The paper presented studies of massive amorphous and nanocrystalline alloys produced by alternative method – injection casting in two variants – with and without suction. That kind of production allow produced alloys with same chemical composition as commercial but with far better properties.

Zmiany tekstury wyżarzania w wyniku oddziaływania temperatury i zewnętrznych naprężeń rozciągających w nanokrystalicznym stopie na bazie kobaltu

100%

Bałaga Z. , Stradomski Z.

tom Vol. 27, nr 3

112-114

W pracy przedstawiono zmiany tekstury w nanokrystalicznym stopie Co66Fe4Mo2Si16B12 otrzymanym na drodze wyżarzania rezystancyjnego szkła metalicznego. Wyniki badań wykazały, że wprowadzenie naprężeń rozciągających częściowo odtwarzających warunki eksploatacyjne amorficznych rdzeni transformatorów może prowadzić do powstawania uprzywilejowanego ułożenia określonych płaszczyzn i kierunków krystalograficznych względem kierunku przepływu prądu i wprowadzanych naprężeń.

The paper presents texture changes in the Co66Fe4Mo2Si16B12 nanocrystalline alloy obtained by way of resistance annealing of metallic glass. The investigation results have shown that the introduction of tensile stresses partially reproducing the conditions of operation of amorphous transformer cores may lead to the occurrence of a preferred packing of specific crystallographic planes and directions in relation to the direction of current flow and stresses being introduced.