scholarly journals Texture Evolution and Anisotropy of Plastic Flow in Hot Compression of Extruded ZK60-T5 Magnesium Alloy Plate

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1170
Author(s):  
Chalasani Dharmendra ◽  
Mukesh Jain ◽  
Yellapregada Prasad ◽  
Kamineni Pitcheswara Rao
Keyword(s):  
Magnesium Alloy ◽  
Transverse Direction ◽  
Processing Map ◽  
Texture Evolution ◽  
Normal Direction ◽  
Hot Compression ◽  
Slip Systems ◽  
Alloy Plate ◽  
Pyramidal Slip ◽  
Pole Figures

The texture evolution during hot compression of extruded ZK60A-T5 magnesium alloy plate loaded along the extrusion direction (ED) and the normal direction (ND) has been examined with the help of pole figures obtained on specimens deformed in the ranges of 200 °C to 500 °C and 0.0003 s−1 to 10 s−1. The results are interpreted in terms of the operating slip systems and mechanisms identified based on processing maps developed for the above two initial specimen orientations. The processing map for the initial ED orientation exhibited three domains. In Domains 1 and 3, first-order pyramidal slip {10 1 ¯ l} <11 2 ¯ 0> occurs, while in Domain 2, second-order pyramidal slip {11 2 ¯ 2} <11 2 ¯ 3> occurs. The pole figures obtained on specimens deformed in Domains 1 and 3 are strikingly similar, indicating that the operating slip system controls the texture evolution. Compression in Domains 1 and 3 nearly randomizes the intense basal texture in the as-received specimens, while a new texture is generated in Domain 2 with basal poles at 45° to ND or transverse direction (TD). This new texture will promote basal slip when loaded in a transverse direction. When loaded in the normal direction (ND), the processing map exhibited four domains. In Domains 1 and 4, {10 1 ¯ l} <11 2 ¯ 3> slip occurs, while {11 2 ¯ 2} <11 2 ¯ 3> slip occurs in Domains 2 and 3. The pole figures obtained from specimens deformed in Domains 1 and 4 have similar features, while those deformed in Domains 2 and 3 exhibited similar features to one another, confirming that the operating slip systems control the texture development since they are the same in each pair. The compression along ND produces strong basal textures with the basal planes normal to the ED. The texture gets intensified with increased temperature of deformation and causes strong anisotropy in mechanical properties.

Synchrotron Radiation Investigation of Twinning in Extruded Magnesium Alloy AZ3l

2005 ◽  
Vol 495-497 ◽  
pp. 1633-1638 ◽  
Author(s):  
Chris H.J. Davies ◽  
Sang Bong Yi ◽  
Jan Bohlen ◽  
Karl Ulrich Kainer ◽  
Heinz Günter Brokmeier
Keyword(s):  
Magnesium Alloy ◽  
Synchrotron Radiation ◽  
Mechanical Behaviour ◽  
Elastic Strain ◽  
Transverse Direction ◽  
Texture Evolution ◽  
Deformation Texture ◽  
Normal Direction ◽  
Az31 Magnesium Alloy

The crystallographic response to deformation – texture evolution, internal elastic strain, and twin evolution – was measured for three load/orientation variants for AZ31 magnesium alloy extrudate tested in-situ in a synchrotron beamline. Specimens were loaded in tension parallel to the extrudate transverse direction, in compression along the same axis, and in compression parallel to the extrudate normal direction. The crystallographic responses are correlated with the mechanical behaviour of the extrudate.

scholarly journals Deformation Microstructures and Textures of Cast Mg-3Sn-2Ca Alloy under Uniaxial Hot Compression

2012 ◽  
Vol 152-154 ◽  
pp. 322-325
Author(s):  
C. Dharmendra ◽  
K.P. Rao ◽  
Y.V.R.K. Prasad ◽  
N. Hort ◽  
K.U. Kainer
Keyword(s):  
Factor Analysis ◽  
Crystallographic Orientation ◽  
Basal Slip ◽  
Texture Evolution ◽  
Hot Compression ◽  
Strain Rates ◽  
Slip Systems ◽  
Schmid Factor ◽  
Orientation Information ◽  
Cylindrical Samples

The influence of deformation conditions on the microstructure and texture evolution during hot compression of Mg-3Sn-2Ca (TX32) has been studied. Cylindrical samples were compressed uniaxially at different combinations of temperatures and strain rates in the ranges 300-500 oC and 0.0003-10 s-1. The crystallographic orientation information of the as-cast and deformed specimens was obtained by EBSD micro-texture analysis. Activation of different slip systems was investigated using Schmid factor analysis and the results reinforce the importance of non-basal slip for deformation at high temperatures. Samples deformed at 500 oC/0.1 s-1 resulted in a fully recrystallized microstructure with near random crystallographic texture.

scholarly journals The Development of Dislocation Structure and Texture in Rolled Copper (001)[110] Single Crystals

1988 ◽  
Vol 10 (1) ◽  
pp. 67-75 ◽  
Author(s):  
M. Wróbel ◽  
S. Dymek ◽  
M. Blicharski ◽  
S. Gorczyca
Keyword(s):  
Electron Microscopy ◽  
Single Crystals ◽  
Dislocation Structure ◽  
Transverse Direction ◽  
Shear Bands ◽  
Taylor Factor ◽  
Initial Orientation ◽  
Slip Systems ◽  
Deformation Bands ◽  
Pole Figures

The initial orientation has split into two equally strong symmetric orientations: (112)[111¯] and (112)[1¯1¯1]. Areas of identical orientation were band shaped and were called deformation bands. Up to 60% reduction, deformation occurs by slip on one plane (one from two possible) in two directions. This leads to the appearance of deformation bands with transition bands between them. Due to such deformation the initial orientation rotates around transverse direction towards the end-orientation {112}〈111〉. Due to rotation of the crystallographic lattice with deformation, the Taylor factor M changes as well, and it causes the activation of two not coplanar slip systems which stabilize the end-orientations {112}〈111〉. Such a sequence of the slip systems activation was concluded from the agreement of the calculated and experimental pole figures. The electron microscopy investigations showed that first shear bands formed due to the activation of these new slip systems.

Post Creep Microstructures of Ti-6A12Sn4Zrf3Mo Alloy

1977 ◽  
Vol 35 ◽  
pp. 274-275
Author(s):  
S. Fujishiro ◽  
A. W. Sommer
Keyword(s):  
Creep Rate ◽  
Transverse Direction ◽  
Elevated Temperatures ◽  
Rolling Direction ◽  
The Other ◽  
Secondary Creep ◽  
Slip Systems ◽  
Alloy Plate ◽  
Schmid Factor ◽  
Secondary Creep Rate

It has been reported (1,2) that in highly textured titanium alloys the secondary creep rate in the direction normal to major concentration of basal poles at elevated temperatures is much greater than that of the c-direction. This phenomenon can be attributed to two major reasons: the first is that Youngs Modulus in the c-direction is approximately 25% higher than in the a-direc- tion; the second is that if an alpha grain is oriented in the c-direction with respect to the applied stress, the Schmid factor for prismatic planes is zero, and thus the slip on the major slip systems is extremely restricted. In the present study, two sets of creep specimens have been prepared from a highly textured Ti-6A12Sn4Zr6Mo alloy plate; one set is parallel to the rolling direction and the other set is parallel to the long transverse direction (major concentration of c-poles).

Meso-modelling study of the mechanical response and texture evolution of magnesium alloy during hot compression

2021 ◽  
pp. 102469
Author(s):  
Qinxiang Xia ◽  
Shuai Yuan ◽  
Gangfeng Xiao ◽  
Jinchuan Long ◽  
Xiuquan Cheng
Keyword(s):  
Magnesium Alloy ◽  
Mechanical Response ◽  
Texture Evolution ◽  
Hot Compression ◽  
Modelling Study

Microstructure and Texture Evolution During Hot Compression of Cast and Extruded AZ80 Magnesium Alloy

2019 ◽  
pp. 89-94
Author(s):  
Paresh Prakash ◽  
Amir Hadadzadeh ◽  
Sugrib Kumar Shaha ◽  
Mark A. Whitney ◽  
Mary A. Wells ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Texture Evolution ◽  
Hot Compression ◽  
Az80 Magnesium Alloy

Effect of severe plastic deformation on an extruded ZK60 magnesium alloy

2016 ◽  
Vol 1818 ◽  
Author(s):  
Florina D. Dumitru ◽  
György Deák ◽  
Oscar F. Higuera-Cobos ◽  
José M. Cabrera-Marrero
Keyword(s):  
Magnesium Alloy ◽  
Tensile Tests ◽  
Equivalent Strain ◽  
Fiber Texture ◽  
Angular Pressing ◽  
Pyramidal Slip ◽  
Processed Material ◽  
Pole Figures ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy

ABSTRACTEqual channel angular pressing (ECAP) was carried out on extruded ZK60 magnesium alloy until an equivalent strain of ∼4 (corresponding to 4 passes) at 523K following route Bc. The effect of the deformation on both microstructure and texture was investigated by analysis of inverse pole figures and pole figures respectively, determined by EBSD. Additionaly, the mechanical properties were evaluated through tensile tests. The ECAPed processed ZK60 alloy showed the presence of dynamic recrystallization (DRX) process, correlated with a strong basal fiber texture. The presence of pyramidal slip was also observed, which can be correlated with the presence on twin-oriented boundaries in the material. Both the grain size reduction and the existence of texture influenced the ductility of the magnesium alloy processed by ECAP, as the ductility of the ZK60 alloy after four ECAP passes increased two times in comparation with the initial (un-processed) material.

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