Microstructure evolutions and mechanical properties of tubular aluminum produced by friction stir back extrusion

Khorrami, M. Sarkari; Movahedi, M.

doi:10.1016/j.matdes.2014.09.018

Cited by 46 publications

(4 citation statements)

References 26 publications

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“…22 The DDRX includes the nucleation and growth of new recrystallized grains in the primary microstructure as a consequence of temperature, EPS, and dislocation density (DD) history. 20,23,24 During the plastic deformation of metals the dislocation density of grains is evolved, which is the most effective parameter on the nucleation and growth of new fine grains. 25,26…”

Section: Micromechanical-based Coupled Cafe Modelmentioning

confidence: 99%

“…Recently, some important models have been presented to predict the grain evolution through CDRX and DDRX of different materials. The vertex model, 16 phase field approach, 17 Monte Carlo method, 6,18 and cellular automaton (CA) model 19,20 are some of the important proposed models in this regard. The CA analysis method was implemented to simulate the evolution of grains during thermomechanical deformation processes due to the ease of calibration in its length scale and also the acceptable simulation time in such processes.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of AZ91 magnesium alloy processed by cyclic contraction/expansion extrusion using the experimental and micromechanical cellular automaton finite element approach

Sadr

Jafarzadeh

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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The feasibility to fabricate ultra-fine-grained AZ91 Mg alloy is investigated with a newly presented severe plastic deformation method entitled cyclic contraction/expansion extrusion. In this method, an initial cylindrical AZ91 Mg billet is placed into a die and the moving punch causes the large deformations by extruding the material in two different regions entitled contraction and extrusion. The evolution of AZ91 microstructure and mechanical properties during cyclic contraction/expansion extrusion was studied through different experimental observations. The microstructure observations showed the ultra-fine-grained structure of AZ91 at the end of the third pass where the average grain size of 600 nm obtained from the initial value of 130 µm. The tensile tests showed that the ultimate tensile strength, yield strength, hardness, and elongation of AZ91 cyclic contraction/expansion extrusion-processed samples are increased significantly. Discontinuous dynamic recrystallization has a main role in the grain refinement of Mg alloys during hot deformations. The evolution of grains in microlevel is analyzed by the cellular automaton finite element method in the DEFORM software environment. The macroscopic flow parameters including effective plastic strain, stain rate, and temperature were calculated in finite element. By tracing these data in defined domain of cellular automaton, the discontinuous dynamic recrystallization of material is analyzed through a devised cellular automaton finite element post-processing step. The imposed plastic strain and variation of dislocation density are the two main driven forces in discontinuous dynamic recrystallization of AZ91 samples during cyclic contraction/expansion extrusion processing. The experimentally observed grains and the cellular automaton finite element predicted microstructure were reasonably in good agreement.

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Section: Micromechanical-based Coupled Cafe Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of AZ91 magnesium alloy processed by cyclic contraction/expansion extrusion using the experimental and micromechanical cellular automaton finite element approach

Sadr

Jafarzadeh

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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show abstract

“…ACCEPTED MANUSCRIPT (10) where and are the parameters entering the Ludwik equation for the fibre material.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Fabricating 'architectured' composite metals with nanostructured components is particularly attractive, and traditional methods of severe plastic deformation (SPD) [7] and their recent developments (e.g. [8], [9] and [10]) appear particularly suitable for that. Indeed, as suggested in Ref.…”

Section: Introductionmentioning

confidence: 99%

Torsional and compressive behaviours of a hybrid material: Spiral fibre reinforced metal matrix composite

et al. 2015

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Process Parameters and Tool Design in Friction Stir Extrusion: A Sustainable Recycling Technique

Akbari,

Asadi,

Behnagh

et al. 2024

Engineering Reports

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Friction stir extrusion (FSE) is a versatile technique that plays a dual role in sustainable recycling and shaping of materials. This method involves a rotating mandrel and a fixed matrix within a mold, where compressed waste metal chips or primary bulk materials are introduced. The rotating mandrel exerts continuous axial pressure, generating frictional heat that softens and bonds the materials together. As the mandrel advances, the materials are reshaped and extruded through the cavity inside the mandrel or the space between the mandrel and the matrix, resulting in the desired product, such as wires or pipes. FSE finds applications in recycling machining wastes, improving powder metallurgy products, producing wire raw materials, creating structures with fine microstructures, and developing new alloys and composites. The resulting materials exhibit refined grains, leading to enhanced mechanical and metallurgical properties. This review article compiles experimental studies exploring the mechanical and microstructural characteristics of samples manufactured using FSE for recycling, reshaping, alloying, or bilayer production. Additionally, it discusses various tool, mold, and machine designs proposed by researchers. Beyond its unique properties, FSE is highlighted as an energy‐efficient, sustainable, and eco‐friendly process.

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Microstructure evolutions and mechanical properties of tubular aluminum produced by friction stir back extrusion

Cited by 46 publications

References 26 publications

Characterization of AZ91 magnesium alloy processed by cyclic contraction/expansion extrusion using the experimental and micromechanical cellular automaton finite element approach

Characterization of AZ91 magnesium alloy processed by cyclic contraction/expansion extrusion using the experimental and micromechanical cellular automaton finite element approach

Torsional and compressive behaviours of a hybrid material: Spiral fibre reinforced metal matrix composite

Process Parameters and Tool Design in Friction Stir Extrusion: A Sustainable Recycling Technique

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