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Characterization of Corrosion and Stress Corrosion Cracking of AE44 Magnesium Alloy

Sozańska M., Mościcki A., Chmiela B.

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 1

479--484

The paper presents the susceptibility of AE44 magnesium alloy to electrochemical corrosion and stress corrosion cracking (SCC). The evaluation of the intensity of the interaction of the corrosive environment was carried out using the corrosion tests and the Slow Strain Rate Test (SSRT). Corrosion tests performed in 0.1 M Na2 SO4 solution (immersion in solution and under cathodic polarization conditions) revealed that the layer of corrosion products was much thicker after immersion test. The results of SSRT showed that the AE44 alloy deformed in the solution was characterized by higher plasticity compared to the alloy deformed in the air after immersion in solution. Moreover, the fractures were characterized by different morphology. In the case of an alloy deformed in the solution under cathodic polarization many microcracks on the fracture were observed, which were not observed in the case of the alloy deformed in the air.

Cooling curve and microchemical phase analysis of rapidly quenched magnesium AM60B and AE44 alloys

Gesing A.J., Sokołowski J. H., Marchwica P.C., Blawert C., Jekl J., Kozdras M., Kasprzak M., Wood J.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 58, nr 2

59--73

Purpose: Development of the understanding of the effect of the solidification rate with the alloy microstructures for the structural AM60B and the creep resistant AE44 Mg casting alloys. Design/methodology/approach: Tubular macro test samples of magnesium alloys AM60B and AE44 were melted and quenched at maximum instantaneous cooling rates ranging from -5°C/s to -500°C/s in the Universal Metallurgical Simulator and Analyzer (UMSA) Technology Platform while recording the temperature-time traces. Such rapid cooling rates are typical in water-cooled dies used in high pressure die casting (HPDC). Characteristic reactions on these curves corresponding to the formation of individual phases during solidification were quantified based on cooling curve analysis combined with metallographic and micro-chemical analysis, with the aid of literature data. Findings: The results indicate that these phases, their size and location in the microstructure, their chemistry and their relative proportions all change in response to the increase in the cooling rate. The results are drastically different for the two alloy systems studied. Solidification of AM60B alloy yields small, equiaxed α-Mg rosettes whose size is mostly independent of the cooling rate. These rosettes nucleate heterogeneously on Al8Mn5 phases that are first to form, and are surrounded by the eutectic structure of Mg and Mg17Al12. In contrast, the AE44 has very large α-Mg grains at all cooling rates. These grains are filled with Al11RE3 platelets or dendrites. Results suggest that the Al11Re3 phase is completely ineffective in heterogeneous nucleation of α-Mg grains. Originality/value: In this research the authors significantly extended the thermal analysis methodology. The specific results obtained on the structural and creep-resistant Mg casting alloys are of significant value to the development of automotive light metal structures and power train components as well as further development of solidification codes for the commercial HPDC process.

Nowe odlewnicze stopy Mg-Al-RE

Rzychoń T., Kiełbus A.

Archiwum Odlewnictwa

2006

R. 6, nr 18/1

167--172

Odlewnicze stopy magnezu Mg-Al-RE są nową grupą stopów przeznaczonych do odlewania ciśnieniowego. Potencjalne zastosowanie tych stopów obejmuje głównie elementy przeznaczone do pracy w temperaturze wyższej od 150ºC. W artykule przedstawiono wyniki badań mikrostruktury odlewniczych stopów magnezu AE44 i AE63 metodami mikroskopii świetlnej, skaningowej i rentgenowskiej analizy fazowej. Stwierdzono, że mikrostruktura stopu AE44 charakteryzuje się obecnością roztworu stałego α-Mg z wydzieleniami faz międzymetalicznych Al11RE3 i Al3RE. Zwiększenie zawartości aluminium, przy równoczesnym zmniejszeniu zawartości pierwiastków ziem rzadkich wpływa na zmniejszenie udziału objętościowego fazy Al3RE.

Cast AE44 and AE63 magnesium alloys are the new group for use to die casting. Potential application these alloys consists mainly elements, which can work at elevated temperature above 150ºC. In this paper are presented results of microstructural examinations of magnesium alloys. The microstructure of these alloy was investigated by using light microscopy, scanning electron microscopy and X-ray diffraction. Microstructure of the AE44 alloy consisted of primary α-Mg grains and precipitations of Al11RE3 and Al3RE phases. The increase aluminum content and decrease rare earths elements lead to microstructure consisted supersaturation α-Mg and precipitations Al11RE3 phase.