Livarski vestnik 61/2014 nr. 2
Maja Vončina1, Lina Jerina2, Primož Mrvar1, Jožef Medved1
1 Univerza v Ljubljani, Naravoslovnotehniška fakulteta, Aškerčeva 12, 1000 Ljubljana
2 BLOK d.o.o. Reciklaža odpadne elektronike in zbiranje odpadnih barvnih kovin, IOC Zapolje II 7, 1370 Logatec
1 Univerza v Ljubljani, Naravoslovnotehniška fakulteta, Aškerčeva 12, 1000 Ljubljana
2 BLOK d.o.o. Reciklaža odpadne elektronike in zbiranje odpadnih barvnih kovin, IOC Zapolje II 7, 1370 Logatec
Jenő DÚL1, Zsolt LESKÓ2
University of Miskolc, Metallurgy and Foundry Institute, 3515 Miskolc-Egyetemváros,
University of Miskolc, Metallurgy and Foundry Institute, 3515 Miskolc-Egyetemváros,
İbrahim ERDEM, Mehmet ÜNAL
Department of Metals, Karabuk University, 78050 Karabuk, Turkey
Department of Metals, Karabuk University, 78050 Karabuk, Turkey
Maja Vončina1, Lina Jerina2, Primož Mrvar1, Jožef Medved1
1 Univerza v Ljubljani, Naravoslovnotehniška fakulteta, Aškerčeva 12, 1000 Ljubljana
2 BLOK d.o.o. Reciklaža odpadne elektronike in zbiranje odpadnih barvnih kovin, IOC Zapolje II 7, 1370 Logatec
OPTIMIZACIJA RAZVRŠČANJA SEKUNDARNIH SUROVIN NA OSNOVI ALUMINIJA
Abstract
At the recycling a secondary, already used materials are processed. In the last decade recycling is being promoted to conserve natural resources and reduce pollution. Purpose of this study was to optimize the sorting of the secondary aluminium. Mixed secondary aluminium was sorted into sheet, colour sheet, wire, profiles and castings. Suitable classified secondary aluminium was melted, the course of the solidification was determined using simple thermal analysis and chemical composition was analyzed. The samples were investigated using optical and electron microscopy and variety of impurities and inclusions were identified. Refining options of the melt were studied. With the correct sorting of the secondary aluminium material and smelting, the secondary alloys can be produced, which have similar chemical composition to the standard aluminium alloys. The aim was to produce the alloys without or with the minimum addition of primary aluminium and alloying elements, which correspond with standard qualification of aluminium alloys. When the microstructure was investigated the impurities in the recycled alloy were detected. The prices between the sorted materials and recycled alloys do not differ significantly. The investment into the secondary smelter would be cost-justified if commercially interesting semiproducts or final products would be produced.
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Jenő DÚL1, Zsolt LESKÓ2
University of Miskolc, Metallurgy and Foundry Institute, 3515 Miskolc-Egyetemváros,
EFFECT OF MELT COMPOSITION AND WALL THICKNESS OF THE HIGH PRESSURE DIE CASTINGS MECHANICAL PROPERTIES
Abstract
In this paper we present two types of currently used vacuum systems on the HPDC and the preparation phase of an experimental series. After that we checked the references, we summarised the advantages and disadvantages of single-step and multi-step vacuum systems. In possession of this information we decided to purchase a multi-step unit and started testing it. Firstly, we took the unit to an industrial partner. The trial period was successful because we were able to revise the quality of the affected cast. The next step was to produce a special die to carry out investigations at the University of Miskolc1. According to the references, one ofthe best ways to examine the inner quality of HPD casts is to make tensile specimens. In our case we designed a four-cavities die with differing parameters. Keywords: high pressure die casting, vacuum, tensile specimen
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İbrahim ERDEM, Mehmet ÜNAL
Department of Metals, Karabuk University, 78050 Karabuk, Turkey
VPLIV STRJEVALNE HITROSTI IN DODATKOV Bi NA MIKROSTRUKTURO IN MEHANSKE LASTNOSTI MAGNEZIJEVIH ZLITIN AM60 V ULITEM STANJU
Abstract
In this study, effects of solidification rate and 0.2, 0.5 and 1.0 .% Bi additions (mass fractions) on the microstructure and mechanical properties of AM60 magnesium alloy were investigated. AM60 and AM60+xBi magnesium alloys were cast in a step-like mould with three different cooling rates. As-cast microstructures of the different steps were examined with optical microscope, SEM and EDS. The results showed that grain structure became finer as the cooling rate increased which resulted in enhancement in the mechanical properties. Tensile and yield strengths reached the peak values as Bi content was 0.2% which yielded 27 and 31 % higher strengths respectively as compared to the base AM60 magnesium alloy.
Mg17Al12 intermetallic phase dispersion was effected as a function of Bi amount added to AM60 magnesium alloy as well as Mg3Bi2 phase formed.
Key Words: Magnesium, AM60 alloy, Mechanical properties, Microstructure.
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