Characterization of Semi-Closed Die-Forged ZK60 Mg Alloy Extrusion

Karparvarfard, Seyyed Mohamad Hasan; Shaha, S.K.; Hadadzadeh, Amir; Behravesh, Seyed Behzad; Jahed, Hamid; Wells, Mary A.; Williams, Bruce W.

doi:10.1007/978-3-319-52392-7_47

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…According to Figure 2A,B, the asextruded material exhibits a bi-modal grain structure consisting of islands of large grains elongated in the extrusion direction (ED) surrounded by fine equiaxed grains. As elsewhere stated, 35,36 the equiaxed grains were formed by partial dynamic recrystallization (DRX) during the extrusion process, whereas the islands were magnesium-rich solid solutions depleted of Zn and Zr during solidification. The islands' resistance to DRX during subsequent low-temperature forging process results in maintaining a bi-modal grain morphology (Figure 2D,E).…”

Section: Microstructure and Texture Analysesmentioning

confidence: 90%

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

Karparvarfard

Roostaei

Behravesh

et al. 2022

Fatigue Fract Eng Mat Struct

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Uniaxial and multiaxial fatigue characteristics of as-extruded and extrudedthen-forged ZK60 magnesium alloys were examined to understand the influence of low-temperature forging on its deformation mechanics. Upon forging, basal texture weakening and grain refinement occurred in ZK60 extrusion. Based on uniaxial results, forging process led to improvements in quasi-static tensile strength and axial cyclic response in high-cycle fatigue regime, whereas shear responses remained unaffected. Biaxial non-proportional tests demonstrated that changing phase angle shift between axial and torsional waveforms had no effect on cyclic axial response, contrary to the shear response. Lastly, critical-plane and energy-based life prediction models were assessed.

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Section: Microstructure and Texture Analysesmentioning

confidence: 90%

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

Karparvarfard

Roostaei

Behravesh

et al. 2022

Fatigue Fract Eng Mat Struct

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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.…”

Section: Zk60mentioning

confidence: 99%

“…A small part with varying thickness was forged from extruded ZK60 stock in Reference [131]. Semi-closed die forging was done at 450 • C and a ram speed of 0.4 mm s −1 , the produced parts were then investigated by compression testing and microstructural analysis.…”

Section: Zk60mentioning

confidence: 99%

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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“…Magnesium (Mg) alloys are the lightest metallic material, which is attractive to automotive, aerospace and electronics for light weighting trades [8][9][10][11]. Mg alloys are positioned in the anodic region of galvanic MATEC Web of Conferences 165, 03014 (2018) https://doi.org/10.1051/matecconf/201816503014 FATIGUE 2018 series.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life enhancement of cast Mg alloy by surface modification in cold spray process

2018

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Abstract. To improve the fatigue life of Mg alloy, high strength AA7075 spherical powder was deposited on AZ31B samples in nitrogen carrier gas environment at 400°C temperature in cold spray process followed by electrostatic painting with zinc phosphate. The fully reverse four-point rotating-bending fatigue tests were conducted on the coated and uncoated samples in different environmental conditions. It is seen that the cold sprayed AA7075 improved the yield strength of the AZ31B cast alloy. Similarly, a significant fatigue enchantment was observed in the coated samples, reaching a fatigue strength of 90 MPa compared to as-cast fatigue strength of 70 MPa at 10 7 cycles when tested in air, and fatigue strength of 80 MPa under a 3.5%NaCl testing environment. The SEM analysis at the interface of the tensile tested sample exhibited the interfacial fracture followed by delamination of the coating. Similarly, delamination of coating was merely detected in the fatigue fracture sample tested in the air, while the sample tested in the corrosive environment showed pits which allowed the solution to penetrate in the AZ31B substrate results delamination and premature failure. However, the presence of e-paint forms a passive layer which is hindering the pit formation and extending the fatigue life.

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Characterization of Semi-Closed Die-Forged ZK60 Mg Alloy Extrusion

Cited by 5 publications

References 12 publications

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

Mg-Alloys for Forging Applications—A Review

Fatigue life enhancement of cast Mg alloy by surface modification in cold spray process

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