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2 Journal of Achievements in Materials and Manufacturing Engineering

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EDS technique appliance for investigation of laser remelted and alloyed magnesium cast alloys

Konieczny J., Labisz K., Włodarczyk-Fligier A., Polok-Rubiniec M.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 69, nr 2

59--63

Purpose: The paper presents the results of the qualitative and quantitative microanalysis of the chemical composition of the MgAl6Zn1 alloy. Design/methodology/approach: The magnesium alloy has been heat treatment at 505°C for 600 min and ageing at 170°C for 720 min. The study was performed on a transmission electron microscope FEI TITAN company operating at 300kV operating voltage. The qualitative and quantitative microanalysis of the chemical composition of the Mg alloy microareas was examined using EDS. Findings: Analysis of the results of the concentration of the main alloying elements in the separation test using various magnifications revealed that with an increase in the share of the magnification of the alloying elements. This increase is referred to a linear, the regression coefficient R2, depending on the test element is in the range 0.84-0.97. Practical implications: Tested MgAl6Zn1 alloy can be applied among the others in automotive industry but it requires additional researches. Originality/value: It was demonstrated that the lower magnesium concentration in the EDS results is connected with the increase of magnification induces an effect of X-rays scattering only from the analysed particles and the effect of Mg matrix is limited.

Effect of high power diode laser surface melting and cooling rate on microstructure and properties of magnesium alloys

Dobrzański L. A., Tański T., Domagała J., Malara S., Król M.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

238-257

Purpose: The goal of this paper is to present the investigation results of MCMgAl12Zn1, MCMgAl9Zn1, MCMgAl6Zn1, MCMgAl3Zn1 cast magnesium alloy in as-cast state and after heat treatment, as well as after laser treatment and thermal analysis during melting and solidification cycles carried out using the Universal Metallurgical Simulator and Analyser. In the following paper the structure and properties were presented of the above mentioned magnesium cast alloys in as-cast state and after a heat treatment. Design/methodology/approach: A casting cycle of alloys was carried out in an induction crucible furnace using a protective salt bath Flux 12 was equipped with two ceramic filters at the melting temperature of 750š10°C, suitable for manufactured material. The following results concern scanning electron microscopy investigations in the SE observation mode, as well as using BSE modus for better phase contrast results, also quantitative microanalysis was applied for chemical composition investigations of the phases occurred. Findings: The analysis of the samples after the ageing process has confirmed that the microstructure of the magnesium cast alloy consists of the solid solution a - Mg (matrix) of the secondary phase b - Mg17Al12 equally located in the structure. The roughness of the surface treatment layer was varied with laser power and also scan rate. Research limitations/implications: According to the alloys characteristics, the applied cooling rate and alloy additions seem to be a good compromise for mechanical properties and microstructures, nevertheless, further tests should be carried out in order to examine different cooling rates and parameters of solution treatment process and ageing process. Practical implications: A desire to create as light vehicle construction as possible and connected low fuel consumption made it possible to make use of magnesium alloys as constructional material in automotive industry. Originality/value: The undertaken examinations aim at defining the influence of chemical composition and precipitation processes on the structure and casting magnesium alloy properties in its state and after heat treatment with a different content of alloy components.