Processing and characterization of AZ91 magnesium alloys via a novel severe plastic deformation method: Hydrostatic cyclic extrusion compression (HCEC)

Siahsarani, Armin; Faraji, Ghader

doi:10.1016/s1003-6326(21)65579-6

Cited by 36 publications

(11 citation statements)

References 62 publications

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“…It is worth mentioning that the I corr values were determined by extrapolating the linear anodic and cathodic sections of the obtained alloy curves. 48…”

Section: Resultsmentioning

confidence: 99%

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Processing of different Mg-based multiphase alloys via a combined severe plastic deformation

Torabi,

Hosseini,

Siahsarani

et al. 2024

Materials Science and Technology

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In this study, cyclic extrusion compression angular pressing-forward extrusion was employed to develop binary magnesium-based multiphase alloys, and subsequently analysed the microstructural, mechanical and corrosional properties of the resulting samples. The findings demonstrate that the inclusion of alloying elements in the multiphase alloys significantly enhances their microstructural, mechanical and corrosional properties. Compared to pure Mg samples fabricated using the same method, the multiphase alloys produced by this technique exhibit finer grain structures. Mechanical analysis indicates that these multiphase alloys possess higher yield and ultimate strength compared to pure magnesium. Corrosion testing reveals that all produced alloys outperform pure magnesium in various aspects. Particularly, Mg–1Zn and Mg–1Mn alloys exhibit exceptional corrosion resistance in immersion, mass loss and polarisation tests.

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“…It is worth mentioning that the I corr values were determined by extrapolating the linear anodic and cathodic sections of the obtained alloy curves. 48…”

Section: Resultsmentioning

confidence: 99%

“…) after specifying the corrosion factors by Tafel fitting, such as potential (E corr ), corrosion current density (I corr ), β c and β a coefficients, and the values are shown in Figure8(b). It is worth mentioning that the I corr values were determined by extrapolating the linear anodic and cathodic sections of the obtained alloy curves 48. …”

mentioning

confidence: 99%

Processing of different Mg-based multiphase alloys via a combined severe plastic deformation

Torabi,

Hosseini,

Siahsarani

et al. 2024

Materials Science and Technology

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“…These alloys have a 1.624 c/a ratio with a hexagonal close-packed (hcp) lattice structure [4]. Due to their low density of 1.74 g/cm 3 , which is 35% lighter than aluminum's 2.7 g/cm 3 and almost five times lighter than steel's 7.9 g/cm 3 , as well as their good castability, thermal conductivity, high electromagnetic shielding characteristics, good die casting, weldability, good mechanical properties, and excellent recyclability they have always been appealing to designers [5-6-7-8-9].…”

Section: Mg and Mg-alloysmentioning

confidence: 99%

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Eljaafari

2023

International Journal of Materials Technology and Innovation

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Grain refinement is an established technique that reduces the grain size of material with the direct intention of improving its finished properties or characteristic. The main objective of grain refinement is to produce a fine, uniform, and equiaxed grain structure. On the other hand, grain refinement of cast magnesium can be achieved by two methods represented by increasing the cooling rate and adding a chemical grain refiner. AZ91 is a cast magnesium alloy used to produce die-cast components. In contrast, the basic microstructure of this alloy consists of a primary αphase in which the aluminum-rich βphase (Mg17 Al12) is precipitated along grain boundaries in cast magnesium alloy. Cast AZ91 alloy generally exhibits low strength and ductility due to the network-like eutectic β-Mg17 Al12 distributed at the grain boundaries. In this review article, the research methods of grain refinement and its effect on the characterization of microstructure and mechanical properties of AZ91 magnesium cast alloy.

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“…HE is optimal for fabricating products with complex shapes and a high extrusion ratio because the processing conditions enable the application of uniform pressure on the product [ 1 ]. In order to produce difficult-to-deform hexagonal close-packed metallic rods with a high length to diameter ratio, novel SPD hydrostatic cyclic extrusion–compression (HCEC) methods have been developed [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…Transmission electron microscope (TEM) observation revealed that the average grain size remained 300 nm in the sub-micron level. Kim et al [ 4 ] found that the hydrostatic extrusion of AlMg7.5 aluminium alloy reduced porosity and produced fibrous structure along the extrusion direction [ 12 ]. The hydrostatic extrusion consolidated the powder metal to a near void-free state and produced a fibrous inner structure by elongating the coarse-grained clusters along the extrusion direction.…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

et al. 2022

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The aim of this study is to determine the influence of the amount of magnesium in Al-Mg alloys and strain rate on the grain refinement and mechanical properties of the material as determined in a dynamic tensile test. Hydrostatic extrusion was used to process the material. This method is not commonly used to impose severe plastic deformation of Al-Mg alloys. The article presents the results of static and dynamic strength tests on aluminium alloys subjected to plastic deformation in the hydrostatic extrusion process. Technically pure aluminium Al99.5 and three aluminium alloys with different magnesium content, Al-1Mg, Al-3Mg and Al-7.5Mg, were used in the tests. The samples were subjected to static tests using the uniaxial tensile test machine and dynamic tests using a rotary hammer. Compared to pure aluminium, increasing the magnesium content in Al-based alloys strengthened them in hydrostatic extrusion (logarithmic strain ε = 0.86) and caused an increase in the static ultimate tensile stress Rm, relative strain εr and the value of the yield stress. For strengthened aluminium alloys, an increase in the strain rate from 750 to 1750 s−1 caused an increase in the dynamic ultimate tensile stress from 1.2 to 1.9 times in relation to the static ultimate tensile stress. The increase in magnesium content results in the formation of a larger strengthening phase, influences a different state of stress during dynamic loading and leads to a change in the orientation of the fracture surface. It was also found that an increase in magnesium content is associated with an increased number of voids, which is also directly proportional to the strain rate in the dynamic rotary hammer test.

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Processing and characterization of AZ91 magnesium alloys via a novel severe plastic deformation method: Hydrostatic cyclic extrusion compression (HCEC)

Cited by 36 publications

References 62 publications

Processing of different Mg-based multiphase alloys via a combined severe plastic deformation

Processing of different Mg-based multiphase alloys via a combined severe plastic deformation

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

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