Texture Memory Effect During Heat Treatment in the Heavily Cold Rolled Ni3Al Foils

2006 ◽  
Vol 980 ◽  
Author(s):  
Masahiko Demura ◽  
Ya Xu ◽  
Kyosuke Kishida ◽  
Toshiyuki Hirano
Keyword(s):  
Grain Growth ◽  
Memory Effect ◽  
Electron Backscatter Diffraction ◽  
Early Stage ◽  
Texture Evolution ◽  
Diffraction Method ◽  
Goss Texture ◽  
Preferential Growth ◽  
Texture Memory ◽  
Cold Rolled

AbstractTexture evolution during grain growth was examined in the 84% cold-rolled Ni3Al with a Goss texture, {110}<001>, using the electron backscatter diffraction method. By recrystallization at 873K/0.5h, the texture was disintegrated and composed of several orientations, most of which had a 40° rotation relationship about <111> to the Goss orientation. Also, a small number of the Goss grains existed. With grain growth, the Goss grains grew faster than the 40°<111> rotated grains, leading to the texture reversion to the original, Goss texture. This phenomenon can be referred to Texture memory effect. In the early stage of the grain growth, the preferential growth occurred on the Goss grains surrounded by the 40°<111> rotated grains. It can be thus ascribed to the high mobility of 40°<111> grain boundary. In the late stage, the Goss grains were adjacent to each other and the preferential growth was accelerated. It is considered that the adjacent Goss grains survived in the grain coalescence process since the boundary between them are low angle boundary having a low energy.

Texture and Ductility of Ni3Al Foils

2011 ◽  
Vol 306-307 ◽  
pp. 116-119
Author(s):  
Masahiko Demura ◽  
Ya Xu ◽  
Toshiyuki Hirano
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Memory Effect ◽  
Texture Evolution ◽  
High Mobility ◽  
Two Stage ◽  
Texture Memory ◽  
Highly Effective ◽  
Cold Rolled

This article presents the texture evolution and the ductility improvement of the cold-rolled foils of boron-free Ni3Al during the recrystallization and the subsequent grain growth. The cold-rolled foils had sharp {110} textures. After the recrystallization at 873K/0.5h, the texture was disintegrated with several texture components. Interestingly, most of them had a single rotation relationship. i.e. 40˚ around <111>. With the progress of the grain growth, however, the texture returned to the sharp, cold-rolled textures. This two-stage texture evolution, called as “Texture memory effect”, was explained assuming a high mobility of the grain boundary with the 40˚<111> rotation relationship. The texture returning was highly effective to improve the ductility of the foils.

scholarly journals Recrystallization Textures in Heavily Cold-Rolled Ni3Al Based Single Crystals

2010 ◽  
Vol 638-642 ◽  
pp. 1288-1293
Author(s):  
Masahiko Demura ◽  
Ya Xu ◽  
Toshiyuki Hirano
Keyword(s):  
Single Crystal ◽  
Grain Growth ◽  
Single Phase ◽  
Texture Evolution ◽  
Diffraction Method ◽  
Electron Backscattered Diffraction ◽  
Two Phase ◽  
Goss Texture ◽  
Cold Rolled ◽  
The Difference

Texture evolution during recrystallization and grain growth was examined for a Ni3Al/Ni two-phase single crystal (binary Ni-18 at.% Al) 83% cold-rolled, then compared with that for a Ni3Al single-phase single crystal (Ni-24 at.% Al). The cold-rolled single crystal had a sharp {110}<001> (Goss) texture. When it was recrystallized at 873K, the texture changed into a complicated one consisting of several components. Most of them had a special rotation relationship to the original Goss texture, i.e. 40˚ about <111>, which special relationship was similarly observed in the single-phase case. The 40˚<111> texture became shaper with no quantitative change as the grain growth proceeded. This high stability of the recrystallized texture contrasted with the single-phase case in which the authors previously found that the texture returned to the original Goss texture. The difference was discussed based on the orientation analysis by an electron backscattered diffraction method.

Ductility of cold-rolled and recrystallized Ni3Al foils

2005 ◽  
Vol 20 (4) ◽  
pp. 1054-1062 ◽  
Author(s):  
Chuanyong Cui ◽  
Masahiko Demura ◽  
Kyosuke Kishida ◽  
Toshiyuki Hirano
Keyword(s):  
Grain Growth ◽  
Late Stage ◽  
Early Stage ◽  
Texture Evolution ◽  
Tensile Elongation ◽  
Area Fraction ◽  
Goss Texture ◽  
Treatment Conditions ◽  
Plane Anisotropy ◽  
Cold Rolled

The room-temperature ductility of 95% cold-rolled and recrystallized Ni3Al(Ni–24.0 at.% Al) foils was examined as a function of heat-treatment conditions. The cold-rolled, diffused Goss texture changed to a complicated, transitional texture in the early stage of grain growth and then returned to a similar diffused Goss texture in the late stage. With the texture evolution, the total area fraction of the tough grain boundaries (GBs) such as Σ1, Σ3, and Σ9 increased from 0.23–0.38 in the early stage to 0.56–0.73 in the late stage. Tensile and bending tests revealed that the ductility was drastically improved with the grain growth. The foils in the early stage fractured without showing yielding. In contrast, the foils in the late stage were very ductile, and the tensile elongation increased to 10% with the grain growth. It was confirmed that there was no in-plane anisotropy in ductility. The ductility improvement with the grain growth was ascribed to the increase in the area fraction of the tough GBs.

Texture Development of Ni3Al Thin Foils during Recrystallization and Grain Growth

2004 ◽  
Vol 467-470 ◽  
pp. 447-452 ◽  
Author(s):  
Masahiko Demura ◽  
Kyosuke Kishida ◽  
Ya Xu ◽  
Toshiyuki Hirano
Keyword(s):  
Grain Growth ◽  
Texture Evolution ◽  
Boundary Energy ◽  
Primary Recrystallization ◽  
Goss Texture ◽  
Preferential Growth ◽  
X Ray ◽  
Thin Foils ◽  
Cold Rolled ◽  
The Difference

The texture evolution of 83% cold-rolled Ni3Al foils during recrystallization was examined through heat treatments at 600 °C, 800 °C, and 1000 °C for 30 min. X-ray texture measurements revealed that the texture changed from the as-rolled Goss to a transitional complicated one by primary recrystallization and eventually returned to the Goss texture during grain growth. The SEM-EBSD analysis revealed that the return to the Goss texture was accompanied by the decrease of random boundaries (RBs) and the increase of S1 boundaries. The preferential growth of the Goss-oriented grains was explained by the difference in the grain boundary energy between the RBs and S1, based on the observed grain-orientation maps.

scholarly journals Texture Memory Effect in Heavily Cold-Rolled Ni3Al Single Crystals

2007 ◽  
Vol 539-543 ◽  
pp. 1513-1518 ◽  
Author(s):  
Masahiko Demura ◽  
Ya Xu ◽  
Toshiyuki Hirano
Keyword(s):  
Single Crystals ◽  
Orientation Relationship ◽  
Grain Growth ◽  
Memory Effect ◽  
Texture Evolution ◽  
Primary Recrystallization ◽  
Drastic Change ◽  
Texture Memory ◽  
Cold Rolled ◽  
Two Stages

The paper presented the texture evolution during primary recrystallization and following grain growth in the heavily cold-rolled Ni3Al single crystals. It turned out that the texture evolution occurred in the two stages. First, primary recrystallization caused the drastic change of the as-rolled texture. Then, as grain growth proceeded, the texture returned to the same one as the as-rolled textures. This texture return can be designated as Texture memory effect. The mechanism of the texture memory effect was discussed based on the analysis of the orientation relationship between the as-rolled and the primary recrystallization textures.

scholarly journals Nucleation Mechanism of 40˚ Rotated Grains during Recrystallization in Heavily Cold-Rolled Ni3Al Single Crystals

2007 ◽  
Vol 558-559 ◽  
pp. 183-188
Author(s):  
Masahiko Demura ◽  
Ya Xu ◽  
Kyosuke Kishida ◽  
Toshiyuki Hirano
Keyword(s):  
Single Crystals ◽  
Electron Backscatter Diffraction ◽  
Rotation Axis ◽  
Diffraction Method ◽  
Primary Recrystallization ◽  
Number Density ◽  
Goss Texture ◽  
Slip Planes ◽  
Cold Rolled ◽  
Main Components

Primary recrystallization textures were examined in the 84% and 95% cold-rolled boron-free Ni3Al single crystals with a Goss texture using the electron backscatter diffraction method. It was found that the main components of the textures in the specimens heat-treated at 873K/0.5h had a 40° rotation relationship about <111> to the original, Goss texture. All the eight variants of 40°<111> rotated grains existed. However, the number density is not even but dependent on whether the rotation axis is identical to the normal of slip planes activated during the prior cold rolling. The ratio of the number density among the variants was same in both the 84% and 95% cold-rolled foils. Based on these results, the formation of these 40°<111> rotated grains was explained assuming the modified multiple twinning mechanism where the annealing twinning occurred at the activated slip planes, followed by the subsequent twinning.

A Role of Low Energy Grain Boundaries in the Abnormal Grain Growth in Fe-3%Si Alloy

2011 ◽  
Vol 127 ◽  
pp. 89-94 ◽  
Author(s):  
Ye Chao Zhu ◽  
Jiong Hui Mao ◽  
Fa Tang Tan ◽  
Xue Liang Qiao
Keyword(s):  
Grain Boundaries ◽  
Grain Growth ◽  
Electron Backscatter Diffraction ◽  
Dominant Role ◽  
Coincidence Site Lattice ◽  
Diffraction Method ◽  
Abnormal Grain Growth ◽  
Low Energy ◽  
Backscatter Diffraction

Low energy grain boundaries were considered to be important in abnormal grain growth by theoretical deduction. The disorientation angles and coincidence site lattice grain boundaries distribution of more than 20 Goss grains and their neighboring matrix grains in primary recrystallized Fe-3%Si alloy were investigated using an electron backscatter diffraction method. It was found that the frequency of low energy grain boundaries of Goss grains which are more likely to abnormally grow are higher than their neighboring matrix grains, which indicated that low energy grain boundaries play a dominant role in the abnormal grain growth of Fe-3%Si alloy. The result meets well with the abnormal grain growth theory.

scholarly journals Texture Evolution during Recrystallization and Grain Growth in Heavily Cold-rolled Fe-3%Si Alloy

2018 ◽  
Vol 58 (10) ◽  
pp. 1893-1900 ◽  
Author(s):  
Masato Yasuda ◽  
Takashi Kataoka ◽  
Yoshiyuki Ushigami ◽  
Kenichi Murakami ◽  
Kohsaku Ushioda
Keyword(s):  
Grain Growth ◽  
Texture Evolution ◽  
Cold Rolled

Recrystallisation, Grain Growth and Texture Evolution in Nonoriented Electrical Steels

2007 ◽  
Vol 558-559 ◽  
pp. 657-664 ◽  
Author(s):  
Jong Tae Park ◽  
Jae Kwan Kim ◽  
Jerzy A. Szpunar
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Grain Growth ◽  
Texture Evolution ◽  
Size Control ◽  
Goss Texture ◽  
Final Annealing ◽  
Electrical Steels ◽  
Grain Size Control ◽  
Specific Orientation

The magnetic properties of nonoriented electrical steels are influenced by grain size and texture of final products. The key technology in the commercial production of nonoriented electrical steels is to grow grains with {hk0}<001> texture up to the optimum size in the final annealing process. The problems related to grain size control have been extensively investigated, while texture control has received much less attention. Therefore, there is enough room to improve the magnetic properties through the control of texture. In this study, systematic investigations on the texture evolution during both recrystallization and grain growth have been made. The formation of recrystallization texture is explained by oriented nucleation. This is supported by the fact that the area fraction of nuclei or recrystallized grains with specific orientation to all new grains remains almost constant during the progress of recrystallization. Most nuclei have a high misorientation angle of 25∼55° with the surrounding deformed matrices. During the progress of grain growth, the Goss texture component continues to decrease because the Goss grains have a high percentage of low angle, low mobility grain boundaries. The grains of Goss orientation have a smaller grain size than those of random orientation.

Sign in / Sign up

Export Citation Format

Share Document