Search results

The shared resource protected by coarse lock contains the resource protected by fine-grained lock.
There are coarse grained lock and fine-grained lock.
The smaller fine-grained lock protects shared-resource, the shorter lock contend time.
Fine-grained lock can decrease the time queued shared resources.
Distribute Queue component sets the number of local queue according to the number of threads and gets bulk tasks from shared sub-queues into the local queue from which thread can get task and implement.

HECAP opens new possibilities for improving equivalent strain in same number of passes as compared to ECAP.
The production of materials with ultra fine grain sizes which can be achieved by subjecting coarse grained metal to Severe Plastic Deformation (SPD) to improve their mechanical and physical properties [5-9].
The magnitude of channel and corner angles along with the number of passes determines the shear strain induced into the sample.
It can also be predicted that number of passes plays a significant role in strain evolution and average equivalent strain increases with increase in number of passes both in HECAP and ECAP.
· Channel angle and number of passes plays a significant role in evolution of strain

PFZ can almost not be observed along grain boundaries in the alloys, where there are only a little of fine precipitates (as shown in Fig.2b).
It has been attributed to an increase in the number of the precipitates as the hardness increase with pre-ageing processes.
(2) The number density and size of precipitates are influenced remarkedly by the ageing processes.
The number density and size of precipitate leading to a hardness level is sensitive to the ageing processes
Forum Vol. 28 (2004), p. 429 Fig.4 Morphology of grain boundaries of 7075Li alloys treated by B4 (a)for 18h and (b) for 36h 0.1μm (a) 0.1μm (b)

The greatly reduced impurity embedded in grain boundaries and more uniform grain sizes do indicate the improvement of material strength and ductility.
The inferior formability of Mg alloy results from the limited number of slip systems of hexagonal close-packed microstructure, which suffocates their applications in the sheet metal forming operation.
A number of previous research showed that elevated temperature can increase the number of slip systems and change the slip direction, which can enhance material ductility and reduce material anisotropy.
Based on a rough calculation using Grain Counting Methods, ASTM E112, the grain size after heat treatment is much more uniform than the original condition.
The average grain size and the roughly calculated maximum grain difference at homogenization temperature of 400 °C with various periods of heating are illustrated in Fig. 3.

Grain size is refined from 33 µm in mill-rolled condition to 3.6 µm upon caliber rolling at 300 °C.
Total number of passes was 5 for each bar with 10% reduction per pass.
After caliber rolling for all the conditions, there occurs grain refinement.
The grain refinement for caliber rolling at 300 °C is noted to be maximum and the grains were equiaxed.
The probable reason for this is the maximum grain refinement achieved at this rolling condition, which has the equiaxed grains with size of 3.6 µm.

The effect of abrasive grain size.
It can be derived that, as the particle size number of abrasive grains increases, the surface roughness decreases, and the smallest case happens when size number equals to 1000#.
Same as the traditional mechanical finishing, the greater the particle size number of abrasive grains is, the better the finishing surface roughness is achieved.
Therefore, within a certain grain size range, the surface roughness improved with the increase of the grain size number.
While as the grain size number is too large, the mechanical action goes weak and can’t match with the electrochemical action, and the residual passivation film makes the surface roughness increases.

Although the grain was refined, the formability was depressed.
The random texture was possibly attributed to the decrease in c/a value, critical resolved shear stress for non-basal slip and the increase of the numbers of shear bands [8, 9].
The average grain size of the alloy was measured via the linear intercept method.
It could be known that the original grains were elongated and a large number of deformation twins appear inside the original grains.
Many fine DRXed grains and deformation twins which surrounded by the DRXed grains were shown in Fig.3a.

A characteristic feature of a material with a large number of fine grains is a significant increase in the total surface area of the grains and an increased proportion of the volume of intergranular space compared to coarse-grained materials.
First of all, cooling after being melted, components with a high melting point begin to form a crystal lattice and a fine-grained structure in the presence of an increased number of crystallization centers.
As each grain passes near neighboring grains, the deformed layer experiences a deformation effect from the contacting grains.
As we go through each grain of adjacent grains, the deformed layer is affected by them.
Chukanov, etc., From the history of the superplasticity effect of metal systems, in: Algebra, Number Theory and Discrete Geometry: Modern Problems, Applications and Problems of History.

The overall microstructure model has been validated based on a number of laboratory simulations of the entire hot strip rolling and controlled cooling process with an emphasis on industrially relevant run-out table cooling strategies. 1.
Saturated aqueous picric acid was used to reveal austenite grain boundaries.
Austenite grain growth Austenite grain growth studies were primarily been conducted to establish suitable reheating conditions for subsequent deformation and transformation studies.
The effect of grain size, however, is negligible.
To validate the transformation model as the critical part of the proposed microstructure model a number of selected stepped cooling tests have been conducted replicating industrial run-out-table cooling strategies.

Equal channel angular pressing (ECAP) is one of the most efficient SPD processes, which allows a grain size of about 1µm to be achieved [1].
The results of the EBSD analysis indicated that the average grain size and misorientation angle are about 120µm and 21 o , respectively.
Many dislocations are visible inside the grain.
The grain size and subgrain size were measured to be about 1µm and 200nm, respectively.
The sizes of the grain and subgrain did not change significantly and the dislocation density inside the grain remained high.