Investigation of Friction Boundary Conditions during Extrusion of Aluminium and Magnesium Alloys

Sanabria, Vidal; Mueller, Soeren; Gall, Sven; Reimers, W.

doi:10.4028/www.scientific.net/kem.611-612.997

Cited by 18 publications

(6 citation statements)

References 7 publications

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“…The influence of the layers on tensile strength and microstructure of fine drawn wires was discussed in [4]. One of the distinguished material properties within the layers is fine grain microstructure [4][5][6][7][8][9][10][11][12][13]. It is, therefore, reasonable to name these layers fine grain layers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Frictional Conditions on the Generation of Fine Grain Layers in Drawing of Thin Steel Wires

Stolyarov

Polyakova

Atangulova

et al. 2019

Metals

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The process of drawing thin carbon steel wires through conical dies is used as an experimental method for determining the effect of frictional conditions and die angle on the generation of fine grain layers in the vicinity of the friction surface. In this study, a quantitative criterion for determining the thickness of fine grain layers is proposed. The criterion is based on the coefficient of anisotropy that characterizes the shape of grains. It is shown that fine grain layers are generated under all frictional conditions investigated, but the thickness of the layer depends on these conditions and die angle.

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Section: Introductionmentioning

confidence: 99%

Effect of Frictional Conditions on the Generation of Fine Grain Layers in Drawing of Thin Steel Wires

Stolyarov

Polyakova

Atangulova

et al. 2019

Metals

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“…Many experiments have confirmed that the excellent mechanical properties of magnesium alloy products could be achieved under an appropriate extrusion parameter due to dynamic recrystallization (DRX), which could serve as the dominant mechanism for grain refinement [10][11][12]. Furthermore, the quality of the extruded products also exhibits the fluidity of alloy, the stress state, friction, and lubrication conditions dependence inside the extrusion die [13,14].…”

Section: Introductionmentioning

confidence: 98%

Microstructure and Mechanical Properties of Characteristic Regions Inside Mold During Mg–Al–Zn Alloy Extrusion Processing

Tang

Zhou

Fan

et al. 2019

Metallogr. Microstruct. Anal.

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The microstructure and mechanical properties of AZ33 magnesium alloy during forward extrusion processing have been investigated in this paper. The results showed that three characteristic regions exist in the extrusion die, namely dead metal zone (dead zone), shear deformation zone (shear zone), and normal flow zone (normal zone) according to apparently uneven flow behavior. The microstructure of three characteristic zones exhibits a recrystallized, heterogeneous deformation feature. An obvious mechanical anisotropy is obtained in the AZ33 alloy inside the extrusion die. The sample of the normal zone exhibits extraordinary ultimate compression strength of 282.86 MPa but the lowest compression yield strength of 163.99 MPa due to typical (0002)//ED fiber texture. However, the highest compression yield strength of 210.56 MPa achieved in the dead zone is attributed to dislocations hardening and the refinement hardening effect via twin lamellae.

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“…The gradient of material properties near a surface has a significant effect on the performance of structures and machine parts at service conditions (for example, on tribological properties [1][2][3][4][5]) and subsequent technological processes (for example, on diffusion bonding [6]). This gradient can be induced using various techniques (for example, dry friction [6][7][8][9][10][11] and deformation processes [12][13][14][15][16][17]). Independently from how the gradient has been induced, it is necessary to have an accurate experimental method for determining the thickness of the layer of intensive plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

A New Experimental Method for Determining the Thickness of Thin Surface Layers of Intensive Plastic Deformation Using Electron Backscatter Diffraction Data

2020

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It is, in general, essential to investigate correlations between the microstructure and properties of materials. Plastic deformation often localizes within thin layers. As a result, many material properties within such layers are very different from the properties in bulk. The present paper proposes a new method for determining the thickness of a thin surface layer of intensive plastic deformation in metallic materials. For various types of materials, such layers are often generated near frictional interfaces. The method is based on data obtained by Electron Backscatter Diffraction. The results obtained are compared with those obtained by an alternative method based on microhardness measurements. The new method allows for determining the layer thickness of several microns in specimens after grinding. In contrast, the measurement of microhardness does not reveal the presence of this layer. The grain-based and kernel-based types of algorithms are also adopted for determining the thickness of the layer. Data processed by the strain contouring and kernel average misorientation algorithms are given to illustrate this method. It is shown that these algorithms do not clearly detect the boundary between the layer of intensive plastic deformation and the bulk. As a result, these algorithms are unable to determine the thickness of the layer with high accuracy.

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Investigation of Friction Boundary Conditions during Extrusion of Aluminium and Magnesium Alloys

Cited by 18 publications

References 7 publications

Effect of Frictional Conditions on the Generation of Fine Grain Layers in Drawing of Thin Steel Wires

Effect of Frictional Conditions on the Generation of Fine Grain Layers in Drawing of Thin Steel Wires

Microstructure and Mechanical Properties of Characteristic Regions Inside Mold During Mg–Al–Zn Alloy Extrusion Processing

A New Experimental Method for Determining the Thickness of Thin Surface Layers of Intensive Plastic Deformation Using Electron Backscatter Diffraction Data

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