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MICROSTRUCTURAL ANALYSIS OF THE SURFACE LAYERS OF THE AZ91D ENRICHED WITH AL AND SI BY THERMOCHEMICAL TREATMENT

1 MOLA Renata
Co-authors:
1 CIEŚLIK Michał
Institution:
1 Kielce University of Technology, Faculty of Mechatronics and Mechanical Engineering, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland, UE, e-mail: rmola@tu.kielce.pl
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1181-1187
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
432 views / 256 downloads
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Abstract

Surface layers enriched with Al and Si were fabricated on an AZ91D substrate using thermochemical treatment in solid media. The AZ91D specimens were heated in an Al+Si powder mixture acting as a source of diffusion elements. Two temperatures were applied: 430 oC and 445 oC. The microstructural characterization of the layers was performed using an optical microscope and a scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (EDS). The layer produced at 430 oC had a thickness of 50 µm; the structure was composed of intermetallic Mg17Al12 and Al3Mg2 phases and an Mg2Si phase. When a higher temperature (445 oC) was used, the layer was much thicker (600 µm) and the structure was predominantly a eutectic (an Mg17Al12 intermetallic phase + a solid solution of Al in Mg) with agglomerates of Mg2Si phase particles distributed over the eutectic matrix.

Keywords: Magnesium alloy, thermochemical treatment, diffusion, surface layer, microstructure

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