scholarly journals Structure Characteristics Affected by Material Plastic Flow in Twist Channel Angular Pressed Al/Cu Clad Composites

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4161 ◽  
Author(s):  
Lenka Kunčická ◽  
Zuzana Klečková
Keyword(s):  
Plastic Flow ◽  
Strain Path ◽  
Shear Texture ◽  
Double Pass ◽  
Structure Characteristics ◽  
Angular Pressing ◽  
Numerical Predictions ◽  
The Individual

The study focuses on structure analyses, texture analyses in particular, of an Al/Cu clad composite manufactured by single and double pass of the twist channel angular pressing (TCAP) method. Microscopic analyses were supplemented with numerical predictions focused on the effective imposed strain and material plastic flow, and microhardness measurements. Both the TCAP passes imparted characteristic texture orientations to the reinforcing Cu wires, however, the individual preferential grains’ orientations throughout the composite differed and depended on the location of the particular wire within the Al sheath during extrusion, i.e., on the dominant acting strain path. The second TCAP pass resulted in texture homogenization; all the Cu wires finally exhibited dominant A fiber shear texture. This finding was in accordance with the homogenization of the imposed strain predicted after the second TCAP pass. The results also revealed that both the component metals exhibited significant deformation strengthening (which also caused bending of the ends of the Cu wires within the Al sheath after extrusion). The average microhardness of the Cu wires after the second pass reached up to 128 HV, while for the Al sheath the value was 86 HV.

Computer Simulation of Kinematics of Plastic Flow and the Deformed Condition of Metal at Processes Equal-Channel Angular Pressing

2008 ◽  
Vol 584-586 ◽  
pp. 1077-1082
Author(s):  
Aleksandr V. Belevich ◽  
D.M. Babin
Keyword(s):  
Computer Simulation ◽  
Carbon Steel ◽  
Plastic Flow ◽  
Equal Channel Angular Pressing ◽  
Technological Process ◽  
Equal Channel Angular Extrusion ◽  
Theoretical Research ◽  
Angular Pressing ◽  
The Given ◽  
Local Parameters

Object of researches in the given paper is the technological process of obtaining from carbon steel method equal-channel angular extrusion (ECAE) on one pass. The purpose of theoretical research is the working of recomdations on projection of the process with the help of a designed technique of simulation of process ECAE in CAE systems. Calculations were done under variable conditions ECAE over the range changes of parameters: a corner of intersection of channels Ф from 90 up to 150 grades, speed of driving press from 0,05 m/s up to 0,2 m/s, temperature from 20°С up to 600°С. As a result quantitative links of local parameters (stresses, strains and temperature) are established with geometrical and technological ECAE parameters to one separate pass. Regularities of change of parameters to ECAE process of cylindrical preforms in diameter of 20 mm and 30 mm are established (steel 0,15%С), are investigated; character of change of a tension in the instrument and power conditions of the process was studied.

A Comparison of Two Fan Stage Designs With Different Rotor Leading Edge Sweep

2014 ◽  
Author(s):  
John Gunaraj ◽  
David Hanson ◽  
Jeffrey Hayes ◽  
Heath Lorzel ◽  
Nick Nolcheff ◽  
...  
Keyword(s):  
Pressure Ratio ◽  
Stability Margin ◽  
Leading Edge ◽  
Flow Capacity ◽  
Numerical Predictions ◽  
Performance Trends ◽  
Ansys Cfx ◽  
Significant Difference ◽  
Total Temperature ◽  
The Individual

Two modern single-stage fans have been designed to meet the same set of performance objectives. The most significant difference between the two designs is the fan rotor leading edge sweep. The baseline rotor has a moderately aft swept leading edge while the redesigned rotor has a more complex sweep distribution, including moderate forward sweep in the tip region. Each stage consists of the fan rotor, full span stator, and split mid-frame, and is designed for a medium bypass ratio turbofan application. The stator and the mid-frame are identical for the two configurations. The primary purpose of this study is to validate the CFD methodology, in this case a steady ANSYS-CFX approach, to predict the fan stage performance at the operating point at two tested speeds and also to predict the stalling throttle condition. Numerical predictions and engine test results are presented and show good agreement. These predicted results are compared with high quality test data including thorough measurements of total pressure and total temperature at both the rotor and stator exits allowing for a detailed understanding and comparison of the individual blade row performance. The analytical model identifies the key performance trends, including an increase in flow capacity and stability margin with equivalent stage pressure ratio and efficiency for the redesigned fan relative to the baseline.

Twist-channel angular pressing: effect of the strain path on grain refinement and mechanical properties of copper

2011 ◽  
Vol 46 (24) ◽  
pp. 7865-7876 ◽  
Author(s):  
Radim Kocich ◽  
Jaroslav Fiala ◽  
Ivo Szurman ◽  
Adéla Macháčková ◽  
Milan Mihola
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Strain Path ◽  
Angular Pressing

Serrated Plastic Flow of Various Metallic Glasses during Nanoindentation

2016 ◽  
Vol 368 ◽  
pp. 3-6
Author(s):  
Mária Huráková ◽  
Kornel Csach ◽  
Jozef Miškuf ◽  
Alena Juríková ◽  
Štefan Demčák ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Metallic Glasses ◽  
Alloy Composition ◽  
Loading Rate ◽  
Glass Forming Ability ◽  
Loading Rates ◽  
Glass Forming ◽  
Wide Range ◽  
The Individual

Nanoindentation experiments were executed on amorphous metallic ribbons made of Fe40Ni40B20, Cu47Ti35Zr11Ni6Si1 and Zr65Cu17.5Ni10Al7.5 that differ in microhardness and glass forming ability. The individual serrated plastic flow events were analyzed in a wide range of the loading rates. In the individual pop-in events of the load-displacement (P-h) curve the contributions of plastic deformation (Δhpl) were calculated depending on the loading rate and the alloy composition. It is concluded that the contribution of the serrated plastic deformation flow varies with the composition of the alloy. The highest plastic deformation for the individual pop-ins was observed for Zr-based metallic glasses.

Effect of Strain Path on Microstructure and Texture Development in ECAP Processed AA3104 Alloy

2010 ◽  
Vol 160 ◽  
pp. 265-272 ◽  
Author(s):  
Henryk Paul ◽  
Thierry Baudin ◽  
A. Tarasek ◽  
M. Miszczyk
Keyword(s):  
Strain Path ◽  
Texture Evolution ◽  
Second Phase ◽  
Local Orientation ◽  
Angular Pressing ◽  
Orientation Mapping ◽  
The Matrix ◽  
Purity Material ◽  
Extension Direction ◽  
Planar Dislocation

The objective of the study was to determine the effect of strain path on texture, microstructure and mechanical properties development of severely deformed Al-Mn-Mg alloy. The commercial purity material (AA3104 alloy) was deformed via Equal Channel Angular Pressing (ECAP) up to 10 passes following routes A, B, and C. The deformed and partially recrystallized microstructures and the crystallographic textures were characterized by transmission (TEM) and scanning (SEM) electron microscopy including systematic local orientation measurements (TEM and SEM FEG orientation mapping). The crystallographic texture was determined using X-ray diffraction on a sample section perpendicular to the extension direction (ED). In order to estimate the homogeneity of strengthening the systematic measurements of Vickers micro hardness in the plane perpendicular to the ED was performed. It was found out that different routes led to strong differences in microstructure of billets. In the case of route A and B strong macro cracking appeared after 5 and 3 passes, respectively. A good quality billet after 10 passes was obtained only in the case of route C. Texture evolution turned out to follow nearly the same ‘course’ for different routes of ECAP. However, the intensity of particular texture components was different in each case. TEM observations and local orientation measurements allowed identifying fine and strongly disoriented planar dislocation structure of nanolayers in the case of route A and C. In the case of route B nearly equiaxed structure of fine grains was observed after 3 passes. Moreover, irrespective of the applied deformation routes large, not deformable second phase particles strongly influenced strengthening of the matrix and nucleation during the recrystallization.

scholarly journals Morphological and Crystallographic Effects in the Laser Powder-Bed Fused Stainless Steel Microstructure

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 672
Author(s):  
Tim Fischer ◽  
Leonhard Hitzler ◽  
Ewald Werner
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Crystallographic Texture ◽  
Experimental Studies ◽  
Grain Morphology ◽  
Steel Microstructure ◽  
Numerical Predictions ◽  
Anisotropic Mechanical Properties ◽  
The Individual ◽  
Individual Grains

One of the key aspects in additive manufacturing of stainless steels is the relationship between process parameters and the resulting microstructure. The selected process parameters typically cause a rapid solidification of the material, which leads to a microstructure that is highly textured both morphologically and crystallographically. While the morphological texture is characterised by a mainly columnar shape of the grains, the crystallographic texture is marked by a preferred grain orientation in the <001> direction (fibre texture). Due to the texture effects, pronounced anisotropic mechanical properties are present in the material. In this report, a series of virtual microstructures with different morphological and crystallographic features are generated to develop a fundamental understanding of the individual texture effects on the mechanical properties. The grain morphology is based on Voronoi tessellations, and the crystallographic texture is captured with crystal plasticity. Furthermore, the numerical predictions are compared with experimental studies. The mechanical properties predicted on the basis of the virtual microstructures show that the crystallographic effect is much more dominant than the morphology of the individual grains. Consistent with the experiments, the highest load-bearing capacity of the material occurs when the macroscopic loading acts under an angle of 45∘ to the preferred orientation of the crystals.

Effects of strain hardenability and strain-rate sensitivity on the plastic flow and deformation homogeneity during equal channel angular pressing

2001 ◽  
Vol 16 (3) ◽  
pp. 856-864 ◽  
Author(s):  
Hyoung Seop Kim ◽  
Sun Ig Hong ◽  
Min Hong Seo
Keyword(s):  
Strain Rate ◽  
Strain Hardening ◽  
Plastic Flow ◽  
Equal Channel Angular Pressing ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Strain Hardening Exponent ◽  
Angular Pressing ◽  
Deformation Inhomogeneity ◽  
Method Analysis

The effects of strain hardenability and strain rate sensitivity on the plastic flow and deformation inhomogeneity during equal channel angular pressing were studied using a finite element method analysis. In this study, perfect plastic nonhardening and rate-insensitive materials, and rate-sensitive materials were considered. In case of the nonhardening and rate-insensitive materials, the deformed geometry was predicted to be quite uniform and homogeneous. Deformation inhomogeneity developed, however, in materials with finite work-hardening exponent and strain-rate sensitivity. The corner gap formed in strain-hardening materials whereas the upper and lower channel gaps formed in strain-rate-sensitive materials. The deformation inhomogeneity was strongly dependent on the relative effects of strain-hardening exponent and strain-rate sensitivity. The predictions on the deformation inhomogeneity and the formation of corner and channel gaps were compatible with the experimental data published in the literature.

scholarly journals Plastic Flow and Strain Homogeneity of an Equal Channel Angular Pressing Process Enhanced through Forward Extrusion

2010 ◽  
Vol 51 (5) ◽  
pp. 977-981 ◽  
Author(s):  
A. V. Nagasekhar ◽  
S. C. Yoon ◽  
J. H. Yoo ◽  
S.-Y. Kang ◽  
S. C. Baik ◽  
...  
Keyword(s):  
Plastic Flow ◽  
Equal Channel Angular Pressing ◽  
Forward Extrusion ◽  
Angular Pressing ◽  
Pressing Process ◽  
Strain Homogeneity
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