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

1997 ◽  
Vol 28 (3-4) ◽  
pp. 197-209 ◽  
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.

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

1999 ◽  
Vol 32 (1-4) ◽  
pp. 197-219 ◽  
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.

scholarly journals Influence of Second Phase Particles on Recrystallisation of Cold-Rolled Low Carbon Microalloyed Steels during Isothermal Annealing

2005 ◽  
Vol 500-501 ◽  
pp. 803-0 ◽  
Author(s):  
Carlos Capdevila ◽  
Tommy De Cock ◽  
Carlos García-Mateo ◽  
Francisca García Caballero ◽  
Carlos García de Andrés
Keyword(s):  
Nucleation Site ◽  
Microalloyed Steels ◽  
Second Phase ◽  
Low Carbon ◽  
Pinning Effect ◽  
Second Phase Particles ◽  
Preferential Nucleation ◽  
Cold Rolled ◽  
Carbon Microalloyed ◽  
Preferential Nucleation Site

The recrystallisation behaviour of two cold-rolled low carbon microalloyed steels with different Ti content was investigated by thermoelectric power (TEP) measurements and metallography. It was shown that recrystallisation was more sluggish in the higher Ti grade steel as compare with traditional ELC and LC steels. The existence of Ti in solid solution together with the pinning effect of Nb-, V- and Ti-rich particles are likely to be responsible for such behaviour. Metallographic etching with picral revealed that cementite act as preferential nucleation site for recrystallisation.

Dependence of fracture toughness on multiscale second phase particles in high strength Al alloys

2003 ◽  
Vol 19 (7) ◽  
pp. 887-896 ◽  
Author(s):  
G. Liu ◽  
G.-J. Zhang ◽  
X.-D. Ding ◽  
J. Sun ◽  
K.-H. Chen
Keyword(s):  
Fracture Toughness ◽  
High Strength ◽  
Al Alloys ◽  
Second Phase ◽  
Second Phase Particles

scholarly journals A Microstructure Investigation of the Deformation and Recrystallization of Particle-Containing Aluminium-Silicon Alloys

1993 ◽  
Vol 20 (1-4) ◽  
pp. 125-140 ◽  
Author(s):  
F. Habiby ◽  
F. J. Humphreys
Keyword(s):  
Single Crystals ◽  
Recrystallization Texture ◽  
Rolling Texture ◽  
Plasticity Theory ◽  
Second Phase ◽  
Slip Systems ◽  
Deformation Bands ◽  
Silicon Alloys ◽  
X Ray ◽  
Second Phase Particles

Single crystals and polycrystals of aluminium containing non-deformable second-phase particles of silicon, have been deformed, and the resultant structures investigated by microscopy and by X-ray and microtexture techniques. The particle size is found to influence the scale of the deformation bands formed, and there is evidence that particles may affect the nucleation of these bands. The deformed materials were recrystallized, and the effect of particle stimulated nucleation on the weakening of the rolling texture is discussed with reference to a computer simulation. In contrast, the recrystallization texture of particle-containing single crystals deformed on only two slip systems is sharp, and it is shown that the texture components are consistent with plasticity theory.

Nucleation-Mediated Structural Refinement and Aluminium Alloy Design

2006 ◽  
Vol 519-521 ◽  
pp. 191-196 ◽  
Author(s):  
Barry C. Muddle ◽  
Jian Feng Nie
Keyword(s):  
Amorphous Matrix ◽  
Thermomechanical Processing ◽  
Nanocrystalline Structure ◽  
Al Alloys ◽  
Grain Structure ◽  
Second Phase ◽  
Structural Refinement ◽  
Second Phase Particles ◽  
Solid State Phase Transformation ◽  
Structural Scale

Regardless of whether it is cast microstructure, the grain structure that is the product of thermomechanical processing or the nanoscale dispersions of strengthening second-phase particles, it is inescapable that the structural scale that controls mechanical properties in Al alloys is determined primarily by processes of nucleation during either solidification, recrystallisation or solid-state phase transformation. In those advanced alloys with bulk amorphous or nanocrystalline structure, production of an amorphous precursor is reliant on initial suppression of the nucleation of crystallisation, and subsequent controlled nucleation of dispersed nanocrystals within amorphous matrix. The processes of nucleation that control structural scale in modern Al alloys are briefly reviewed, with a focus on potential for further structural refinement and advances in properties.

Microstructure, Texture and Recrystallisation Mechanisms of an Al-20%Sn Deformation Processed Metal-Metal Composite

2012 ◽  
Vol 715-716 ◽  
pp. 522-527 ◽  
Author(s):  
Rafael Schouwenaars ◽  
Hugo A. Duran ◽  
Víctor H. Jacobo ◽  
Armando Ortiz
Keyword(s):  
Phase Distribution ◽  
Rolling Texture ◽  
Coarse Grained ◽  
Al Alloy ◽  
Second Phase ◽  
Metal Composite ◽  
Fine Grained ◽  
Texture Change ◽  
Metal Metal ◽  
Cold Rolled

Al-Sn alloys for tribological applications are industrially important alloys which have attracted little attention over their history. Being cold rolled directly from thin cast slabs and consisting of two ductile phases, their processing and physical behaviour are distinct from classical Al-Alloys. During cold rolling, the coarse-grained, random texture of the slab is transformed into the classical rolling texture of a fine-grained Al-alloy, with elongated Al-grains delimited by thin Sn-ribbons. During annealing at 300°C, the interior of the Al-grains recrystallises rapidly while the liquid Sn-phase migrates toward Al-grain triple lines to form a reticular structure. A weak texture, dominated by Goss and P is produced. Grain growth within the original cold-rolled grains is fast, but once the recrystallised grain size reaches the length scale of the second-phase distribution, it slows down and both phases coarsen simultaneously, accompanied by a significant texture change.

Measuring and Modelling the Microstructures of Two-Phase Aluminium Alloys after Deformation

2012 ◽  
Vol 715-716 ◽  
pp. 23-32 ◽  
Author(s):  
John F. Humphreys ◽  
Pete S. Bate ◽  
Ali Gholinia ◽  
Ian Brough
Keyword(s):  
Aluminium Alloys ◽  
Second Phase ◽  
Two Phase ◽  
New Techniques ◽  
Deformation Microstructure ◽  
Deformation Structures ◽  
Deformable Particles ◽  
Second Phase Particles ◽  
Cold Rolled ◽  
Ebsd Method

The effect of second-phase particles on the deformation and annealing behaviour of metals is re-assessed in the light of some new techniques. Using an EBSD method which provides much improved angular resolution, the effect of small non-deformable particles on the homogeneity of the deformation microstructure has been quantified. The presence of micron sized second-phase particles alters the deformation microstructure adjacent to particles, and a 3-d investigation of the deformation structures associated with large (>1μm) second-phase particles in cold rolled aluminium alloys has been carried out using 3-d FIB sectioning combined with EBSD, and the microstructures compared with the predictions of 3-d CPFEM modelling. The effects of grain orientation, strain and particle size have been investigated, and the results compared with earlier TEM investigations of such microstructures.

Impact Behavior Characterization on Fractured Pins of AISI E52100 Steel

2014 ◽  
Vol 793 ◽  
pp. 1-10
Author(s):  
B. Vargas-Arista ◽  
M.A. Gómez-Morales ◽  
E. Garfias-García ◽  
F. García-Vázquez
Keyword(s):  
Ductile Fracture ◽  
Grain Boundaries ◽  
Brittle Failure ◽  
Volume Fraction ◽  
Particle Density ◽  
Impact Behavior ◽  
Second Phase ◽  
Automotive Components ◽  
Nucleation Sites ◽  
Second Phase Particles

Two fractured pins of impact wrench were evaluated by fractography using scanning electron microscopy. This pneumatic wrench is used to the fabrication of automotive components being characterized by its power and tightening capacity. The important part of the wrench is the pin clutch impact mechanism used to generate high torque. An original pin manufactured with AISI E52100 steel adjusted 2,580 nuts before fracture and a substitute pin of E52100 modified steel with S adjusted 7,095 nuts before failure. Fractographic analysis in both fracture surfaces indicated a ductile-brittle mixed fracture mode. Original pin surface exhibited a granular appearance while substitute pin surface showed fibrous and rough morphology. Precipitation of nearly rounded, elliptical and elongate second – phase particles containing Cr, C and Mn measured as intergranular and transgranular particle density was observed, promoting some brittle failure zones and ductile fracture measured as the volume fraction of grain boundaries and microvoids, respectively. A larger amount of intergranular medium precipitates was found on the original pin which favored the brittle failure among the grain boundaries compared to that of the substitute pin. The ductile fracture by larger transgranular fine particle density which acted as nucleation sites of higher volume fraction of microvoids was found in the substitute pin.

Orientation Mapping Study on the Inhomogeneous Microstructure Evolution during Annealing of 6013 Aluminum Alloy

2010 ◽  
Vol 163 ◽  
pp. 13-18 ◽  
Author(s):  
M. Bieda-Niemiec ◽  
Krzystof Sztwiertnia ◽  
A. Korneva ◽  
Tomasz Czeppe ◽  
R. Orlicki
Keyword(s):  
Aluminum Alloy ◽  
Particle Distribution ◽  
Phase Particle ◽  
Second Phase ◽  
Transmission Electron ◽  
Orientation Mapping ◽  
Initial Stage ◽  
Second Phase Particles ◽  
Cold Rolled

Orientation mapping in transmission electron microscope was successfully applied to study microstructural changes at the initial stage of recrystallization in the aluminum alloy with a bimodal second-phase particle distribution. The alloy samples were reversibly cold rolled resulting in the formation of laminar structure with zones of localized strain around large second-phase particles. Orientation mapping and in-situ investigations carry information about the processes which are active in the deformation zones during annealing.

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