Annealing Textures of Cold-Rolled Fe-Si-Al Alloys

In the present study, a modified cellular automaton CORe (Cellular Operator for Recrystallization) was used to predict the recrystallization (RX) texture and microstructure of 70% cold rolled commercial AA8079L alloy at 300°C. The nucleation of the Cube orientation is of considerable scientific interest since the Cube texture component influences significantly the anisotropy of material properties. Experimental data collected during this investigation were used for subsequent modeling. By studying the annealed material by EBSD, an average nucleation rate at Cube bands was established and used in the model. The simulated microstructure reveals, in general, good agreement with experiment. The texture prediction shows the right tendency, but the modeled intensity of the Cube texture is about 2 times smaller than in experiment.

Download Full-text

Recrystallization Behavior and Texture Evolution in Severely Cold-rolled Fe-0.3Mass%Si and Fe-0.3Mass%Al Alloys

Tetsu-to-Hagane ◽

10.2355/tetsutohagane.tetsu-2015-043 ◽

2015 ◽

Vol 101 (11) ◽

pp. 611-618 ◽

Cited By ~ 1

Author(s):

Miho Tomita ◽

Tooru Inaguma ◽

Hiroaki Sakamoto ◽

Kohsaku Ushioda

Keyword(s):

Texture Evolution ◽

Al Alloys ◽

Recrystallization Behavior ◽

Cold Rolled

Download Full-text

Annealing of Cold Worked Hypostoichiometric Ni3Al Alloys Using Positron Lifetime Spectroscopy

MRS Proceedings ◽

10.1557/proc-81-111 ◽

1986 ◽

Vol 81 ◽

Cited By ~ 2

Author(s):

S. G. Usmar ◽

K. G. Lynn

Keyword(s):

Positron Lifetime ◽

National Laboratory ◽

Al Alloys ◽

Oak Ridge ◽

Annealing Temperatures ◽

Vacancy Migration ◽

Oak Ridge National Laboratory ◽

Positron Lifetime Spectroscopy ◽

Cold Rolled ◽

Cold Worked

AbstractHypostoichiometric Ni3Al alloys of composition 76.2 Ni:23.8 Al containing impurity levels of boron and hafnium (supplied by Oak Ridge National Laboratory) were either cold rolled or pressed. Rolled and pressed samples were deformed by 20% and 10% thickness reductions, respectively. Samples were annealed isochronally at approximately 50ºC intervals up to 1050ºC. Two major annealing stages were apparent in all three alloys studied. These could be attributed to vacancy migration to sinks and annealingof dislocations and(or) recrystallization. The onset of vacancy migration occurred at approximately 200ºC in all three alloys. Annealing of dislocations started at 650ºC to 700ºC and was complete at 1000ºC for alloys which contained boron and or hafnium impurities. In the pure alloy the onset of dislocation annealing occurred at 800ºC and was incomplete at the highest (1050ºC) annealing temperatures reached.

Download Full-text

Development of Laser Welding Methods for Cold-Rolled Thin Foils of Ni3Al Alloys

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet1952.67.4_185 ◽

2003 ◽

Vol 67 (4) ◽

pp. 185-188 ◽

Cited By ~ 3

Author(s):

Masashi Oikawa ◽

Katsuhiro Minamida ◽

Masahiko Demura ◽

Kyousuke Kishida ◽

Toshiyuki Hirano

Keyword(s):

Laser Welding ◽

Al Alloys ◽

Thin Foils ◽

Cold Rolled

Download Full-text

A Simulation of Recrystallization Textures of Al-Alloys With Consideration of the Probabilities of Nucleation and Growth

Textures and Microstructures ◽

10.1155/tsm.32.197 ◽

1999 ◽

Vol 32 (1-4) ◽

pp. 197-219 ◽

Cited By ~ 23

Author(s):

O. Engler

Keyword(s):

Recrystallization Texture ◽

Rolling Texture ◽

Al Alloys ◽

Second Phase ◽

Microstructural Parameters ◽

Nucleation Sites ◽

Acta Mater ◽

Growth Selection ◽

Cold Rolled ◽

Growth Probability

The characteristic recrystallization texture components of cold rolled Al-alloys can be traced back to a growth selection of grains with an approximate 40º 〈111〉 orientation relationship out of a limited spectrum of preferentially formed nucleus orientations. Accordingly, recrystallization textures can be modeled by the multiplication of a function f(g)nucl describing the probability of nucleation of the various orientations and a function f(g)grow representing their growth probability.Whereas the growth probability can be accounted for by a 40 111 transformation of the rolling texture, the nucleation probability of the respective grains is given by the distribution of potential nucleus orientations, which is known from local texture analysis for the most important nucleation sites in cold rolled Al-alloys, cube-bands, grain boundaries and second-phase particles. If several nucleation sites are active simultaneously, the nucleation probabilities have to be weighted according to their respective proportions. For that purpose, the numbers of nuclei forming at the various nucleation sites were calculated according to a model approach proposed by Vatne et al. (Acta Mater 44, 1996, 4463–4473).The paper describes the model for recrystallization texture simulation in Al-alloys and gives examples of recrystallization textures simulated regarding a variation of different microstructural parameters to demonstrate the predictive power of the model.

Download Full-text

Simulation of the Recrystallization Textures of Al-Alloys on the Basis of Nucleation and Growth Probability of the Various Textures Components

Textures and Microstructures ◽

10.1155/tsm.28.197 ◽

1997 ◽

Vol 28 (3-4) ◽

pp. 197-209 ◽

Cited By ~ 17

Author(s):

O. Engler

Keyword(s):

Rolling Texture ◽

Nucleation Site ◽

Al Alloys ◽

Second Phase ◽

Nucleation Sites ◽

Second Phase Particles ◽

Growth Selection ◽

Cold Rolled ◽

Limited Spectrum ◽

Growth Probability

The recrystallization textures of cold rolled Al-alloys are simulated under the assumption of a growth selection of the typical recrystallization texture components out of a limited spectrum of preferentially formed nucleus orientations. The probability of nucleation is derived from the distribution of the potential nucleus orientations which was determined by EBSD local texture analysis for the most important nucleation sites in cold rolled commercial Al-alloys, i.e. Cube-bands, grain boundaries and second phase particles. If several nucleation sites are active simultaneously, the total nucleation probability is composed of the respective contributions of each nucleation site. The growth probability is derived from a 40°<111> transformation of the rolling texture. The resulting recrystallization textures are simulated by multiplying these two probability functions, i.e. the ODF of the nucleus orientations with the ODF of the 40°<111>-transformed rolling texture.

Download Full-text

Recrystallization Behavior and Texture Evolution in Severely Cold-rolled Fe-0.3mass%Si and Fe-0.3mass%Al Alloys

ISIJ International ◽

10.2355/isijinternational.isijint-2016-634 ◽

2017 ◽

Vol 57 (5) ◽

pp. 921-928 ◽

Cited By ~ 3

Author(s):

Miho Tomita ◽

Tooru Inaguma ◽

Hiroaki Sakamoto ◽

Kohsaku Ushioda

Keyword(s):

Texture Evolution ◽

Al Alloys ◽

Recrystallization Behavior ◽

Cold Rolled

Download Full-text

The Ordered Phase Formation in Ti-Al-Ga Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069193 ◽

1970 ◽

Vol 28 ◽

pp. 440-441

Author(s):

Shiro Fujishiro ◽

Harold L. Gegel

Keyword(s):

Thermal Stability ◽

High Temperature ◽

Titanium Alloys ◽

Growth Kinetics ◽

Stoichiometric Composition ◽

Good Potential ◽

Alpha Titanium ◽

Cold Rolled ◽

Kinetics Of ◽

Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

Download Full-text

Observation of faint contrast at planar faults in alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100108842 ◽

1978 ◽

Vol 36 (1) ◽

pp. 340-341

Author(s):

K. Kuroda ◽

Y. Tomokiyo ◽

T. Kumano ◽

T. Eguchi

Keyword(s):

Reciprocal Lattice ◽

Beam Theory ◽

Al Alloys ◽

Small Displacement ◽

Electron Microscopic ◽

Lattice Vector ◽

Fringe Contrast ◽

Planar Fault ◽

Lattice Displacement ◽

The Many

The contrast in electron microscopic images of planar faults in a crystal is characterized by a phase factor , where is the reciprocal lattice vector of the operating reflection, and the lattice displacement due to the fault under consideration. Within the two-beam theory a planar fault with an integer value of is invisible, but a detectable contrast is expected when the many-beam dynamical effect is not negligibly small. A weak fringe contrast is also expected when differs slightly from an integer owing to an additional small displacement of the lattice across the fault. These faint contrasts are termed as many-beam contrasts in the former case, and as ε fringe contrasts in the latter. In the present work stacking faults in Cu-Al alloys and antiphase boundaries (APB) in CuZn, FeCo and Fe-Al alloys were observed under such conditions as mentioned above, and the results were compared with the image profiles of the faults calculated in the systematic ten-beam approximation.

Download Full-text