Mechanism of size effects in microcylindrical compression of pure copper considering grain orientation distribution

Rare Metals ◽  
2013 ◽  
Vol 32 (1) ◽  
pp. 18-24 ◽  
Author(s):  
Chuan-Jie Wang ◽  
Chun-Ju Wang ◽  
Bin Guo ◽  
De-Bin Shan ◽  
Yan-Yan Chang
Keyword(s):  
Size Effects ◽  
Grain Orientation ◽  
Pure Copper ◽  
Orientation Distribution

scholarly journals Spatially resolved measurements of grain size effects on the shock and spall response of quasi-Taylor wave loaded pure copper

2017 ◽  
Vol 122 (3) ◽  
pp. 035106
Author(s):  
G. Whiteman ◽  
G. D. Owen ◽  
J. De'Ath ◽  
D. J. Chapman ◽  
D. E. Eakins ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Effects ◽  
Pure Copper ◽  
Spatially Resolved ◽  
Grain Size Effects

Effect of Grain Orientation Distribution on Anisotropy of Idealized Granular Materials

2012 ◽  
Vol 174-177 ◽  
pp. 24-29
Author(s):  
Bo Zhou ◽  
Ji Wei Li ◽  
Peng Shuai
Keyword(s):  
Granular Materials ◽  
Grain Orientation ◽  
Volumetric Strain ◽  
Friction Angle ◽  
Orientation Distribution ◽  
Biaxial Compression ◽  
Shape Effect ◽  
Vertical Loading ◽  
Horizontal Loading ◽  
Long Rod

Abstract. The regular grain orientation of granular materials is a common phenomenon in nature. Based on the research of grain shape effect on mechanical property of granular materials, two kinds of idealized shape grain (kind of long rod and square) assemblies with different grain orientation were studied by simulated biaxial compression test using Discrete Element Method. The significant orientation which can be computed as the mean value of all grain orientation is introduced to represent the orientation regularity of granular materials. In order to study the anisotropy, the mobilized friction angle and volumetric strain of assemblies with different significant orientation were obtained under both vertical and horizontal loading. The results show that the regular orientation of grains influences the movement such as motion and rotation obviously; with the increasing of significant orientation, peak mobilized friction angle of long rod grain assembly gradually increases under horizontal loading, and decreasing under vertical loading.

Role of grain orientation distribution in the ferroelectric and ferroelastic domain switching of ferroelectric polycrystals

2013 ◽  
Vol 61 (16) ◽  
pp. 6037-6049 ◽  
Author(s):  
J. Wang ◽  
W. Shu ◽  
T. Shimada ◽  
T. Kitamura ◽  
T.-Y. Zhang
Keyword(s):  
Grain Orientation ◽  
Domain Switching ◽  
Orientation Distribution

Cast NiTi Shape-Memory Alloys

2004 ◽  
Vol 855 ◽  
Author(s):  
Alicia M. Ortega ◽  
Carl P. Frick ◽  
Jeffrey Tyber ◽  
Ken Gall ◽  
Hans J. Maier
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Grain Orientation ◽  
Mechanical Response ◽  
Complex Geometry ◽  
Low Cost ◽  
Orientation Distribution ◽  
Scanning Calorimetry ◽  
Cast Material ◽  
Niti Shape Memory Alloys

ABSTRACTThe purpose of this study is to investigate the structure and properties of polycrystalline NiTi in its cast form. Although it is commonly stated in the literature that cast NiTi has poor shape-memory behavior, this study demonstrates that with appropriate nano/micro structural design, cast NiTi possesses excellent shape-memory properties. Cast NiTi shape-memory alloys may give rise to a new palette of low-cost, complex-geometry components. Results from two different nominal compositions of cast NiTi are presented: 50.1 at.%Ni and 50.9 at.%Ni. The cast NiTi showed a spatial variance in grain size and a random grain orientation distribution throughout the cast material. However, small variances in the thermo-mechanical response of the cast material resulted. Transformation temperatures were slightly influenced by the radial location from which the material was extracted from the casting, showing a change in Differential Scanning Calorimetry peak diffuseness as well as a change in transformation sequence for the 50.9 at.%Ni material. Mildly aged 50.9 at.%Ni material was capable of full shape-memory strain recovery after being strained to 5% under compression, while the 50.1 at.%Ni demonstrated residual plastic strains of around 1.5%. The isotropic and symmetric response under tensile and compressive loading is a result of the measured random grain orientation distribution. The favorable recovery properties in the cast material are primarily attributed to the presence of nanometer scale precipitates, which inhibit dislocation motion and favor the martensitic transformation.

The Origin of Mis-Oriented Diamond Grains Nucleated Directly on (001) Silicon Surface

1998 ◽  
Vol 529 ◽  
Author(s):  
R.Q. Zhang ◽  
W.J. Zhang ◽  
C. Sun ◽  
X. Jiang ◽  
S.-T. Lee
Keyword(s):  
Grain Orientation ◽  
Silicon Surface ◽  
Diamond Films ◽  
Orientation Distribution ◽  
Interface Structure ◽  
Silicon Surfaces ◽  
Diamond Growth ◽  
Diamond Nucleation ◽  
Interfacial Structures ◽  
Zero Degree

AbstractThe origin of mis-oriented diamond grains frequently observed in heteroepitaxial diamond films on (001) silicon surfaces was studied. By statistically analyzing the in-plane rotation angles of diamond grains in scanning electron microscopy observations, it was found that the distribution of the grain orientation is not random and two satellite distribution peaks at about 20° and 30° accompany the main distribution peak at zero degree referenced to the <110> direction of substrate. The interface structure corresponding to the main distribution peak at zero degree of oriented diamond growth has been proposed in our previous studies. In this study, our molecular orbital PM3 simulation of a step-by-step diamond nucleation further reveals two other metastable diamond/silicon interfacial structures. The orientations of the corresponding diamond grains are parallel to the (001) silicon surface but with in-plane rotations of 20° and 30° respectively with respect to the <110> direction. We relate these two mis-oriented growths to the two satellite peaks of grain orientation distribution. Based on this study, the possibility in experiment to reduce the formation of mis-oriented configurations and to obtain a perfectly oriented diamond growth is discussed.

scholarly journals Grain orientation distribution and development of grain line in highly ordered Bi4Si3O12 micro-crystals

2010 ◽  
Vol 42 (1) ◽  
pp. 51-59 ◽  
Author(s):  
Z.G. Zhang ◽  
X.F. Wang ◽  
Q.Q. Tian
Keyword(s):  
Grain Orientation ◽  
Environmental Scanning Electron Microscopy ◽  
Orientation Distribution ◽  
Growth Direction ◽  
The Other ◽  
Environmental Scanning ◽  
Ordered Structure ◽  
Kolmogorov Smirnov ◽  
The One ◽  
Sintering Method

Bismuth silicate (Bi4Si3O12) micro-crystals with a grain line structure were grown by a sintering method under atmosphere pressure. The as-grown products were studied using Xray diffraction (XRD) and Environmental scanning electron microscopy (ESEM). The grain orientation law was tested by the One-Sample Kolmogorov-Smirnov (K-S) test. The result shows Bi4Si3O12 grains are always distributed in pairs on both sides of a stable line. On one side of a line, the angle between grain orientation and the growth direction of the line obeys the normal distribution. It indicates that the grains on one side have almost the same orientation. The range of mean angle on one side is from 53.9? to 68.9? in a stable line. There is a highly positive correlation between mean angle and mean growth rate on one side of a stable line. If a mean angle on one side exceeds the maximum mean angle of a stable line, the highly ordered structure on the opposite side will be destroyed. However, the elimination process on the destructed side has no effect on the highly ordered structure on the other side. There are two kinds of grain line creation. One originates from a defect on one side of a line, and the other originates from the boundary between neighboring lines.

Texture in films and Coatings

1997 ◽  
Vol 472 ◽  
Author(s):  
J.A. Szpunar
Keyword(s):  
Grain Orientation ◽  
Grain Shape ◽  
Structural Parameters ◽  
Relative Proportion ◽  
Stacking Faults ◽  
Orientation Distribution ◽  
Film Structure ◽  
Frame Of Reference ◽  
Micro Structure ◽  
Physical Chemical

The field of films and coatings is very broad. In general, the structure of films may comprise several phases, each having a different micro-structure and composition. These phases may be built up from grains which have different sizes, shape, morphology and orientation. A description of those types of films is complex and a large number of structural parameters is needed to fully characterize them. It is therefore more convenient to use a statistical description of them and to specify the relative proportion of different phases, grain orientation distribution [1], the orientation correlation between neighbouring crystals [2] and grain shape and size distribution [3]. Such a description provides details of the microstructural geometry of films, thereby giving a frame of reference within which various properties of films and a microstructural transformation of film structure, can be analyzed. Such microstructural descriptions have to be often supplemented by information about the nature and distribution of lattice defects, dislocations, stacking faults and antiphase boundaries. All this information put together, helps to provide a better understanding of the behaviour and various physical, chemical, mechanical and other properties, of films and coatings.

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