Fatigue characteristics and modeling of cast and cast-forged ZK60 magnesium alloy

Karparvarfard, Seyyed Mohamad Hasan; Shaha, S.K.; Behravesh, Seyed Behzad; Jahed, Hamid; Williams, Bruce W.

doi:10.1016/j.ijfatigue.2018.03.019

Cited by 46 publications

(17 citation statements)

References 68 publications

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“…In the works of Karparvarfard et al [129][130][131][132] cast and extruded ZK60 was used for forging trials with various geometries accompanied by investigations of microstructure and mechanical properties. In References [129,130] cast stock was used to produce flatbread samples by isothermal open-die forging. Before deformation, the forging stock was held at forming temperature for 3.5 h. As the samples deformed with 350 • C and 0.65 mm s −1 showed cracks after forming, only samples forged at 450 • C were used for the following investigations.…”

Section: Zk60mentioning

confidence: 99%

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Mg-Alloys for Forging Applications—A Review

et al. 2020

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Interest in magnesium alloys and their applications has risen in recent years. This trend is mainly evident in casting applications, but wrought alloys are also increasingly coming into focus. Among the most common forming processes, forging is a promising candidate for the industrial production of magnesium wrought products. This review is intended to give a general introduction into the forging of magnesium alloys and to help in the practical realization of forged products. The basics of magnesium forging practice are described and possible problems as well as material properties are discussed. Several alloy systems containing aluminum, zinc or rare earth elements as well as biodegradable alloys are evaluated. Overall, the focus of the review is on the process control and processing parameters, from stock material to finished parts. A discussion of the mechanical properties is included. These data have been comprehensively reviewed and are listed for a variety of magnesium forging alloys.

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Section: Zk60mentioning

confidence: 99%

“…The fracture surfaces of the as-cast material showed less dimples and a more brittle appearance in general. In Reference [130] fatigue testing and fracture surface analysis were done on a sample formed at 6.5 mm s −1 . The forged samples showed higher fatigue strength when compared to the as-cast material in general.…”

Section: Zk60mentioning

confidence: 99%

Mg-Alloys for Forging Applications—A Review

et al. 2020

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“…Magnesium alloys, because of their low density, high specific strength, high damping capacity, and good castability [1][2][3], are attractive for lightweight applications in the automotive and aerospace industries, such as transmission housing, engine blocks, steering components, and wheels. Since many structural components are subjected to in-service cyclic stresses, the study of fatigue behaviour of both cast and wrought magnesium alloys, such as magnesium-zinc-zirconium (ZK) alloys, is gaining increasing interest [1,[4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Plasma Electrolytic Oxidation on Fatigue Behaviour of ZK60A-T5 Magnesium Alloy

et al. 2020

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Magnesium alloys are used in the motorsport and aerospace fields because of their high specific strength. However, due to their low corrosion resistance, protective surface treatments, such as conversion coating or electroless plating, are necessary when they are used in humid or corrosive environments. The present study aimed at evaluating the effect of plasma electrolytic oxidation (PEO), followed by the deposition of a polymeric layer by powder coating, on the rotating bending fatigue behaviour of the wrought magnesium alloy ZK60A-T5. The specimens were extracted from forged wheels of racing motorbikes and were PEO treated and powder coated. Microstructural characterization was carried out by optical (OM) and scanning electron microscopy (SEM) to analyse both the bulk material and the multilayer, consisting of the anodic oxide interlayer with the powder coating top layer (about 40 µm total thickness). Rotating bending fatigue tests were carried out to obtain the S–N curve of PEO-treated specimens. The results of the rotating bending tests evidenced fatigue strength equal to 104 MPa at 106 cycles and 90 MPa at 107 cycles. The results of the investigation pointed out that PEO led to a reduction in fatigue strength between 14% and 17% in comparison to the untreated alloy. Fracture surface analyses of the fatigue specimens, carried out by SEM and by 3D digital microscopy, highlighted multiple crack initiation sites at the interface between the PEO layer and substrate, induced by the concurrent effects of coating defects, local tensile stresses in the substrate, and increased roughness at the substrate–coating interface.

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“…In the present work, the corrosion properties of as‐cast AZ31B, AZ80, and ZK60 alloys with and without MAO coatings have been investigated using advanced electrochemical and salt spray testing methods. The cast Mg alloys were used as the starting materials for development of the lower control arm . On the basis of the results of the corrosion properties of cast alloys, the corrosion and corrosion fatigue performances of the forged Mg alloys with and without coatings will be investigated in the follow‐up experiments.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the corrosion performances of as‐cast Mg–Al and Mg–Zn magnesium alloys with microarc oxidation coatings

Xue

Pang

Jiang

et al. 2019

Materials & Corrosion

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In the present study, corrosion-protective microarc oxidation (MAO) coatings were prepared on AZ31B, AZ80, and ZK60 cast magnesium alloy substrates in an alkaline silicate electrolyte. The corrosion performances of the uncoated and MAO-coated alloys were investigated using electrochemical and salt spray chamber corrosion tests. The microstructure characterization and experimental results show that among the three alloys studied, the ZK60 Mg alloy exhibited the best and AZ31B the least corrosion resistance under the salt spray conditions. The MAO coating provided robust corrosion protection of the Mg substrates and resulted in a significant decrease in the corrosion rate of the alloys by 3-4 orders of magnitude. The MAO coating on ZK60 alloy showed better corrosion protectiveness than that on the AZ series alloys due to the incorporation of different alloying elements in the coating, especially the Zn and Al elements, which are from the Mg substrate. The corrosion performances and mechanisms of the uncoated and MAO-coated Mg alloys are interpreted in terms of the microstructure and phase/chemical compositions of both the substrates and coatings. K E Y W O R D S electrochemical testing, magnesium alloys, microarc oxidation, salt spray corrosion test

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Fatigue characteristics and modeling of cast and cast-forged ZK60 magnesium alloy

Cited by 46 publications

References 68 publications

Mg-Alloys for Forging Applications—A Review

Mg-Alloys for Forging Applications—A Review

Influence of Plasma Electrolytic Oxidation on Fatigue Behaviour of ZK60A-T5 Magnesium Alloy

Characterization of the corrosion performances of as‐cast Mg–Al and Mg–Zn magnesium alloys with microarc oxidation coatings

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