Influence of heat treatments and Ca additions on the passivation behaviour of high‐pressure die cast AM50

Zander, Daniela; Schnatterer, Christian; Kuhnt, Christopher

doi:10.1002/maco.201508273

Cited by 6 publications

(4 citation statements)

References 34 publications

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“…Considering this, the present work was undertaken to comprehensively study the effectiveness of LFW for two cast Mg alloys of importance to the aerospace and automotive industries: Mg–9Al–1Zn–0.3Mn (AZ91) and AZ91 + 2 wt.% Ca (AZ91–2Ca). It is noteworthy that Ca was selected as a compositional addition in this study due to its positive effect in increasing the ignition resistance of AZ91, as well as improving the corrosion [ 29 , 30 , 31 , 32 ] and high-temperature oxidation [ 33 , 34 ] resistance. These characteristics are of particular importance for aerospace application, and therefore, this addition was made.…”

Section: Introductionmentioning

confidence: 99%

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

et al. 2021

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Solid-state welding offers distinct advantages for joining reactive materials, such as magnesium (Mg) and its alloys. This study investigates the effect of linear friction welding (LFW) on the microstructure and mechanical properties of cast AZ91 (Mg–9Al–1Zn) and AZ91–2Ca alloys, which (to the best knowledge of the authors) has not been reported in the literature. Using the same set of LFW process parameters, similar alloy joints—namely, AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca—were manufactured and found to exhibit integral bonding at the interface without defects, such as porosity, inclusions, and/or cracking. Microstructural examination of the AZ91/AZ91 joint revealed dissolution of the Al-rich second phase in the weld zone, while the Mn containing phases remained and were refined. In the AZ91–2Ca/AZ91–2Ca joint, the weld zone retained Ca- and Mn-rich phases, which were also refined due to the LFW process. In both joint types, extensive recrystallization occurred during LFW, as evidenced by the refinement of the grains from ~1000 µm in the base materials to roughly 2–6 µm in the weld zone. These microstructural changes in the AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca joints increased the hardness in the weld zone by 32%. The use of digital image correlation for strain mapping along the sample gage length during tensile testing revealed that the local strains were about 50% lower in the weld zone relative to the AZ91 and AZ91–2Ca base materials. This points to the higher strength of the weld zone in the AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca joints due to the fine grain size, second phase refinement, and strong basal texture. Final fracture during tensile loading of both joints occurred in the base materials.

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Section: Introductionmentioning

confidence: 99%

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

et al. 2021

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“…The wire was led through a drill hole, which was subsequently sealed. A schematic illustration of a sample prepared for potentiodynamic polarization can be found elsewhere . The samples for IGC testing according to ISO 11846 B were prepared by cutting the wires in 1.5 cm long pieces and grinding the cutting edges to 1000 grit.…”

Section: Experimental Methodsmentioning

confidence: 99%

Evaluating the intergranular corrosion susceptibility of Al‐Mg‐Si‐Cu alloys using electrochemical methods

Schnatterer

Bulinger

Zander

2016

Materials & Corrosion

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The susceptibility of the 6056 aluminum alloy in the solution annealed (T4) and artificially aged (T6) condition to intergranular corrosion (IGC) was investigated utilizing the established testing standard ISO 11846 B and an electrochemical procedure specified as ISO 11846C. The first method showed significant differences in the corrosion properties of the materials, namely a high pitting susceptibility of the T4 treated material and an exclusive intergranular attack in the artificially aged samples. The electrochemical technique was not suitable to confirm these distinct corrosion properties. However, an alloy specific adaption of the standard was conducted to give comparable results and to qualify the method for high Cu containing 6000 alloys.

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“…Magnesium alloys have been used in automotive, consumer electronics, and communications due to their high strength/weight ratio and low density . However, the poor corrosion properties of magnesium alloys limit their wide applications .…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature and chloride ion concentration on the corrosion behaviour of Mg–4Al–3Ca–0.5RE alloy

Xiong

Lianbo

et al. 2019

Materials & Corrosion

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The influence of temperature and chloride ion concentration on the corrosion behaviour of Mg−4Al−3Ca−0.5RE alloys were studied in this paper. Corrosion rates of the alloys were measured by weight loss test and electrochemical measurement. The results revealed that a shorter incubation period to the onset of corrosion, a more negative corrosion potential, and a higher corrosion rate was correlated with a higher temperature in 3% NaCl solution and a higher chloride ion concentration at 30°C. The corrosion behaviour of the alloys was affected by surface film and the corrosion mainly occurred at the breaks or defects in surface films. K E Y W O R D S chloride ion concentration, corrosion behaviour, magnesium alloys, microstructure, temperature F I G U R E 1 1 X-ray diffractometer pattern of corrosion products of the Mg-4Al-3Ca-0.5RE alloy XIONG ET AL. | 1221

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Influence of heat treatments and Ca additions on the passivation behaviour of high‐pressure die cast AM50

Cited by 6 publications

References 34 publications

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

Evaluating the intergranular corrosion susceptibility of Al‐Mg‐Si‐Cu alloys using electrochemical methods

Influence of temperature and chloride ion concentration on the corrosion behaviour of Mg–4Al–3Ca–0.5RE alloy

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