Improvements in microstructure and mechanical properties of AZ80 magnesium alloy by means of an efficient, novel severe plastic deformation process

Sepahi-Boroujeni, Saeid; Sepahi-Boroujeni, Amin

doi:10.1016/j.jmapro.2016.07.007

Cited by 26 publications

(7 citation statements)

References 22 publications

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“…22,37–39 In addition, several studies have proved that reducing the grain size of Mg alloys results in higher strength which can be related to the Hall–Petch relation. 40–42 Furthermore, it should be noted that ECAP passes enhance elongation to failure (El) of the as-received material. The 2P specimen exhibits the highest elongation among all processed specimens.…”

Section: Resultsmentioning

confidence: 99%

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

Amani

Faraji

Mehrabadi

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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Using biodegradable magnesium microtubes for producing vascular stent have received a great deal of attention during the last decade. However, poor workability and low mechanical properties of Mg and its alloys pose an obstacle to manufacturing microtubes for stent application. In this article, a combined method including equal channel angular pressing), direct extrusion, and microtube extrusion processes are employed to produce WE43 magnesium microtubes. Thus, microtubes with an outside diameter of 3.3 mm and a wall thickness of 0.22 mm are successfully manufactured. The results demonstrate a significant improvement in mechanical properties and microstructure of the processed samples. The ultimate strength and elongation are increased from 240 MPa and 6% to 340 MPa and 20% in the final microtube, respectively. In addition, the microhardness of the final microtube is enhanced from an initial value of 85 Hv to 102 Hv and the grain size is reduced to 3.5 µm from the initial value of 135 µm. Therefore, the proposed method overcomes the poor formability of Mg alloy and can be used to fabricate high-strength microtubes with ultrafine-grained structure.

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Section: Resultsmentioning

confidence: 99%

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

Amani

Faraji

Mehrabadi

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Accordingly, the present investigation was initiated to evaluate the potential for achieving superplastic flow in the AZ80 alloy after processing by HPT. Several useful reports are now available describing the evolution of microstructure and the development of hardness in the AZ80 alloy when processing by HPT and other SPD techniques [37][38][39][40][41][42][43][44]. Thus, in the present research disks of a commercial AZ80 alloy were processed by HPT to produce an ultrafine grain size and then tensile specimens were cut from the disks and pulled to failure over a range of strain rates and testing temperatures to evaluate the potential for achieving superplastic elongations.…”

Section: Accepted Articlementioning

confidence: 99%

Achieving Superplastic Elongations in an AZ80 Magnesium Alloy Processed by High‐Pressure Torsion

et al. 2022

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Processing magnesium alloy by High-Pressure Torsion (HPT) is a technique used successfully to refine the grains of an alloy to the submicrometer and nanometer scale to produce an ultrafine grained microstructure. Grain refinement can improve the mechanical properties of magnesium alloys as well as enhancing its ductility and providing a potential for exhibiting superplastic behaviour at elevated temperature. Research was conducted to process the AZ80 magnesium alloy by HPT at room temperature for different numbers of turns with the microstructures before and after HPT critically Accepted ArticleThis article is protected by copyright. All rights reserved investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Vickers microhardness (Hv) tests. Subsequently, tensile specimens were cut from the processed disks and pulled in tension to failure at temperatures of 473, 523 and 573 K and at strain rates in the range from 1.4 × 10 -4 to 1.4 × 10 -1 s -1 . The introduction of superplasticity in the AZ80 magnesium alloy when processing by HPT was demonstrated for the first time with a maximum elongation of 645% at a testing temperature of 573 K. There was also evidence for low temperature superplasticity with an elongation of 423% at 473 K. The dominant mechanism for superplastic flow was grain boundary sliding with a strain rate sensitivity of m  0.5 and an activation energy of Q  73 kJ mol -1 .

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“…The Equal Channel Angular Pressing (ECAP) method is based on the dislocation activities and is configuration during increased deformation degree [3][4][5][15][16][17][18][19]. In Fig.…”

Section: The Principle Of Equal Channel Angular Pressingmentioning

confidence: 99%

Structure and Properties of Az31 Magnesium Alloy After Combination of Hot Extrusion and Ecap

Hilšer

Rusz

Maziarz

et al. 2017

Acta Metall Slovaca

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Equal channel angular pressing (ECAP) method was used for achieving very fine-grained structure and increased mechanical properties of AZ31 magnesium alloy. The experiments were focused on the, in the initial state, hot extruded alloy. ECAP process was realized at the temperature 250°C and following route Bc. It was found that combination of hot extrusion and ECAP leads to producing of material with significantly fine-grained structure and improves mechanical properties. Alloy structure after the fourth pass of ECAP tool with helix matrix 30° shows a fine-grained structure with average grain size of 2 µm to 3 µm and high disorientation between the grains. More experimental results are discussed in this article.

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Improvements in microstructure and mechanical properties of AZ80 magnesium alloy by means of an efficient, novel severe plastic deformation process

Cited by 26 publications

References 22 publications

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

Achieving Superplastic Elongations in an AZ80 Magnesium Alloy Processed by High‐Pressure Torsion

Structure and Properties of Az31 Magnesium Alloy After Combination of Hot Extrusion and Ecap

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