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1
Content available Effect of Annealing Treatment on (Mg17Al12) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy
Abass Marwa H., Abdulkareem Makarim H., Hussein Hussien A.
Advances in Science and Technology. Research Journal
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2023
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Vol. 17, no 2
330--341
EN
Heat treatment is the most suitable technique for altering the microstructure and, consequently, it is possible to create the optimal balance of corrosion resistance and mechanical strength in a material by carefully regulating the conditions during the heating process. The present work aims to investigate the effect of heat treatments (annealing) at (300°C) at different times (10, 20, and 30 hr) on the magnesium alloy. How the Mg17Al12 phase influences the corrosion behavior of AZ91D magnesium alloy was quantified in different solution (SBF, Lactic and Ringer). It was able to construct an extensive range of Mg17Al12 phase volume fractions by varying the annealing period. The corrosion potential of many specimens with varied proportions of the Mg17Al12 phase was evaluated. The results of the conducted tests manifested that the material's resistance to corrosion greatly improved with an increase in the volume fraction of Mg17Al12 phase. The effect of heat treatment on the microstructure was analyzed using transmission electron microscopy and X-ray diffraction. The SEM photographs evinced that the amount of β-Mg17Al12 phase decreased significantly, with the distribution occurring at the grain boundaries and with increasing the time of annealing, resulting in a highly saturated α-grain. The XRD validated the all material peaks of phases that are present. The corrosion test behavior of AZ91 alloy in the simulated body fluid (SBF), lactic, and Ringer solutions was investigated through electrochemical measurements, the result was elucidated as measured along the Tafel slope, and the corrosion current density of all heat treated samples was lower than that of the as-cast sample. The measurement of hardness (HV) demonstrated that the hardness decreased to (64.5 HV0.5) during the heat treatment. The result antibacterial efficiency was revealed that AZ91 at 30 hr was best then as cast against the bacteria E.coli.
2
Content available Recent studies on particulate reinforced AZ91 magnesium composites fabricated by stir casting - a review
Matta Anil Kumar, Koka Naga Sai Suman, Devarakonda Sameer Kumar
Journal of Mechanical and Energy Engineering
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2020
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Vol. 4, No 2
115--126
EN
Magnesium Metal Matrix Composites (Mg MMC) have been the focus of consideration by many researchers for the past few years. Many applications of Mg MMCs were evolved in less span of time in the automotive and aerospace sector to capture the benefit of high strength to weight ratio along with improved corrosion resistance. However, the performance of these materials in critical conditions is significantly influenced by several factors including the fabrication methods used for processing the composites. Most of the papers addressed all the manufacturing strategies of Mg MMC but no paper was recognized as a dedicated source for magnesium composites prepared through STIR casting process. Since STIR casting is the least expensive and most common process in the preparation of composites, this paper reviews particulate based Mg MMCs fabricated with STIR casting technology. AZ91 series alloys are considered as the matrix material while the effect of different particle reinforcements, sizes, weight fractions on mechanical and tribological responses are elaborated in support with micro structural examinations. Technical difficulties and latest innovations happened during the last decade in making Mg MMCs as high performance material are also presented.
3
Content available remote Odporność odlewniczego stopu magnezu AZ91 na korozję elektrochemiczną
Łyczkowska K.
Przegląd Spawalnictwa
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2018
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R. 90, nr 7
46--49
PL
W artykule przedstawiono wyniki testów odporności na korozję elektrochemiczną odlewniczego stopu magnezu AZ91. Obserwacjom poddano materiał rodzimy i złącza spawane wykonane metodą TIG (141). Jako kryterium odporności na korozję elektrochemiczną przyjęto ubytek masy i czas korozji przy określonych stężeniach roztworu kwasu H2SO4. Stwierdzono, że wzrost stężenia roztworu kwasu wpływa znacząco na szybkość korozji stopu powodując tym samym większą degradację jego powierzchni i większy ubytek masy. Zauważono również, że prędkość korozji maleje w przypadku wydłużenia czasu eksperymentu. Po czasie 72 h prędkość ta spada poniżej 0,1g/(cm2•doba), co spowodowane jest hamowaniem korozji w wyniku zobojętniania się roztworu kwasu.
EN
The article presents the results of AZ91 cast magnesium alloy resistance to electrochemical corrosion. The basic material and welding joints obtained by TIG method (141) were evaluated. The mass loss and corrosion time at specific concentrations of the H2SO4 acid solution were assumed as a criterion of resistance to electrochemical corrosion. It was found that an increase in the acid solution concentration significantly affects the rate of corrosion of alloy, thus causing a greater degradation of its surface and a higher mass loss. It was also noticed that the corrosion rate decreases when the experiment time is extended. After 72 h, this speed drops below 0.1 g/(cm2•day), which is caused by the inhibition of the corrosion as a result of the neutralization of the acid solution.
4
Content available remote The influence of the chosen welding technology on the microstructure and selected mechanical properties of welded magnesium alloy AZ91
Bolanowski P., Dziadoń A.
Przegląd Spawalnictwa
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2017
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R. 89, nr 3
40--45
EN
Magnesium alloys are a part of a group of lightweight alloys, which are important in practical use in constructions. The paper shows the results obtained by research into welded AZ91 magnesium alloy. Within the scope of research microstructure examination and tensile testing were done. Magnesium alloy was welded by two methods – 141 (TIG) and 522 (laser gas welding). The values of tensile strength of welded joints in majority cases were higher than values of tensile strength of the base material. The microstructure examination and chemical analysis made it possible to explain the phenomena occurring in the AZ91 during welding.
PL
Stopy magnezu należą do grupy stopów metali lekkich, używanych w konstrukcjach. W artykule przedstawiono wyniki uzyskane w czasie badań złączy spawanych stopu AZ91. Wykonane zostały: obserwacja mikrostruktury i próba jednoosiowego rozciągania. Złącza zostały wykonane metodą 141 (TIG) i 522 (spawanie laserem gazowym). Wartości wytrzymałości na rozciąganie złączy spawanych w większości przypadków były wyższe niż wartości tych wielkości w przypadku materiału rodzimego. Badania mikrostruktury i składu chemicznego pozwoliły wyjaśnić zjawiska zachodzące w stopie podczas spawania.
5
Content available Metal-metal Cast Composites
Braszczyńska-Malik K. N., Przełożyńska E.
Archives of Foundry Engineering
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2014
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Vol. 14, iss. 3 spec.
110--113
EN
Microstructure of experimental AZ91 magnesium matrix composite with Ti6Al4V particles is presented. Composite were fabricated by casting method. The obtained experimental composite exhibited uniform distribution of Ti6Al4V particles within the matrix alloy. Neither clusters of particles nor any new phases creating during component reactions are observed.
6
Porównanie wybranych metod badania porowatości odlewów ciśnieniowych ze stopu magnezu AZ91
Uniwersał A., Wróbel M., Wroński S., Bonarski J., Tchórz A., Kania B.
Hutnik, Wiadomości Hutnicze
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2013
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Vol. 80, nr 4
235--241
PL
Istotnym czynnikiem decydującym o jakości odlewów ciśnieniowych jest ich porowatość. W pracy testowano przydatność wybranych metod badania porowatości odlewów ciśnieniowych wytwarzanych ze stopu magnezu AZ91. Stosowano następujące metody: pomiary gęstości, rentgenowską tomografią komputerową i mikroskopią akustyczną. Określono zalecany zakres zastosowań poszczególnych metod.
EN
The porosity is an important determinant of the pressure die-castings quality. The study examined the usefulness of selected methods for testing the porosity in pressure castings of the AZ91 magnesium alloy. The following methods were tested: density measurements, computed tomography and acoustic microscopy. The recommended range of application of each method was given.
7
Content available remote Korozja stopu AZ91 i kompozytów typu AZ91/Sic w roztworze Ringera
Kot I., Lelito J., Krawiec H.
Ochrona przed Korozją
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2012
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nr 3
135-137
PL
Magnez, stop AZ91 oraz kompozyty typu AZ91/SiC ulegają aktywnemu roztwarzaniu w roztworze Ringera w temperaturze 36,7°C. Stop magnezu AZ91 dzięki obecności fazy [beta]-Mg17(Al, Zn)12 ma lepszą odporność na korozję niż czysty magnez. Faza [beta]-Mg17(Al, Zn)12 ulega pasywacji, co utrudnia korozję materiału. Obecność węglika krzemu SiC w kompozytach typu AZ91/SiC nie ma istotnego wpływu na odporność korozyjną w roztworze Ringera w porównaniu do stopu AZ91.
EN
Magnesium, AZ91 alloy and composite materials AZ91/SiC undergo active dissolution in Ringer solution at 36,7 C. The corrosion resistance of AZ91 magnesium alloy is determined by [beta]-Mg17(Al, Zn)12 phase. This phase easily undergoes the passivation, hence hinder the corrosion process of AZ91 alloy. However, the presence of SiC in composite AZ91/SiC does not have essential influence on its corrosion resistance in Ringer solution compare to corrosion resistance of AZ91 magnesium alloy.
8
Content available remote Korozja magnezu i stopu AZ91 w wodnych roztworach jonów chlorkowych i siarczanowych
Krawiec H., Kot I., Lelito J., Banaś J.
Ochrona przed Korozją
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2011
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nr 7
462-463
PL
Magnez i stop magnezu AZ91 ulegają aktywnemu roztwarzaniu w wodnych roztworach zawierających jony chlorkowe. Stop magnezu AZ91 dzięki obecności fazy ß-Mg17Al12 ma lepszą odporność na korozję niż czysty magnez. Faza ß-Mg17Al12 ulega pasywacji, co utrudnia korozję materiału. Badania chronoamperometryczne wykazały, że na korozję najbardziej podatna jest osnowa a-Mg.
EN
Magnesium and magnesium alloy AZ91 undergo the active dissolution in the aqueous solution containing the chloride and sulfate ions. The higher corrosion resistance of AZ91 alloy than pure magnesium is related with the presence of ß-Mg17Al12 phase. This phase easily undergoes the passivation process and hinder the corrosion of alloy. Chronoaperometry measurements have revealed that the matrix a-Mg is the most susceptible to corrosion 0.1M Na2SO4.
9
Content available remote Repeatable and reproducible methodology of the AZ91 alloy structure evaluation
Adamiec J., Roskosz S., Cwajna J., Paśko J.
Archives of Foundry Engineering
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2007
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Vol. 7, iss. 2
95-100
EN
The objective of the research conducted was to develop a comprehensive procedure for a quantitative evaluation of magnesium casting alloy's (AZ91) microstructure. The procedure encompasses: a methodology of metallographic specimens preparation, microstructure detection methods, selection of image acquisition methods, image analysis methodology and adjustment of morphological and stereological parameters to the quantitative description of volume fraction of phases and structural components of the AZ91.
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