scholarly journals Temperature Dependence of Grain Boundary Structure and Grain Growth in Bulk Silicon-Iron.

2003 ◽  
Vol 43 (2) ◽  
pp. 245-250 ◽  
Author(s):  
Jeong Sik Choi ◽  
Duk Yong Yoon
Keyword(s):  
Grain Boundary ◽  
Temperature Dependence ◽  
Grain Growth ◽  
Boundary Structure ◽  
Bulk Silicon ◽  
Silicon Iron ◽  
Grain Boundary Structure

scholarly journals Grain and Grain Boundary Structure Evolution Without Texture Changes During Normal Grain Growth in 2-D Al Strips

1999 ◽  
Vol 32 (1-4) ◽  
pp. 187-195 ◽  
Author(s):  
V. Sursaeva ◽  
U. Czubayko ◽  
A. Touflin
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Columnar Structure ◽  
Boundary Structure ◽  
Structure Evolution ◽  
Grain Boundary Character Distribution ◽  
Grain Boundary Character ◽  
Grain Boundary Structure ◽  
Texture Change ◽  
Character Distribution

Changes of the grain boundary character distribution and texture during normal grain growth have been investigated using the SAC-SEM based method and a 4 circle X-ray texture goniometer on A1 strips with columnar structure. The microstructure of the strips consists of regions with oriented (clusters) and randomly oriented grains. All changes of microstructure are outside the clusters during normal grain growth and consequently no texture change was observed.

Effect of CoO Doping on the Sintering Ability and Mechanical Properties of Y-TZP

2004 ◽  
Vol 449-452 ◽  
pp. 265-268 ◽  
Author(s):  
Tetsuhiko Onda ◽  
H. Yamauchi ◽  
Motozo Hayakawa
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Boundary ◽  
Grain Refinement ◽  
Grain Growth ◽  
Sintering Temperature ◽  
Tetragonal Zirconia ◽  
Boundary Structure ◽  
Grain Boundary Structure ◽  
Boundary Strength

The effect of CoO addition into Y-TZP (Yttria doped Tetragonal Zirconia Polycrystals) was studied on the evolution of its sintering ability, grain size, grain boundary structure and mechanical properties. The doping of a small amount of CoO effectively reduced the sintering temperature. A small amount of CoO up to ~ 0.3 mol% was effective for the suppression of grain growth, but the addition of 1.0 mole % resulted in an enhanced grain growth. The hardness and toughness of the CoO doped TZP were about the same as those of undoped TZP. Furthermore, despite the grain refinement, CoO doped TZP did not exhibit improved mechanical properties. This may be suggesting that CoO dopant had weakened the grain boundary strength.

Phase Field Crystal Modeling for Nanocrystalline Growth

2013 ◽  
Vol 785-786 ◽  
pp. 512-516
Author(s):  
Ying Jun Gao ◽  
Wen Quan Zhou ◽  
Yao Liu ◽  
Chuang Gao Huang ◽  
Qiang Hua Lu
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Phase Field ◽  
Grain Orientation ◽  
Boundary Structure ◽  
Two Dimensional ◽  
Grain Boundary Structure ◽  
Simulation Results ◽  
Misorientation Of Grains ◽  
Phase Field Crystal

The two-mode phase field-crystal (PFC) method is used to simulate the nanograin growth, including the grain growth in different sets of crystal planes, the grain boundary structure with mismatch, the grain orientation and also the incoherent grain boundary in two dimensional plane. It is obviously observed that there are dislocation structures in nanograin boundary due to mismatch and misorientation of grains. These simulation results can not only be used in artificial controlling the grain boundary of nanograin, but also is of significant for designing new nanograin with a good grain boundary for structure materials.

Control of Boundary Structure and Grain Growth for Microstructural Design

2005 ◽  
Vol 475-479 ◽  
pp. 3891-3896 ◽  
Author(s):  
Si Young Choi ◽  
Suk Joong L. Kang
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Grain Structure ◽  
Boundary Structure ◽  
Basic Principles ◽  
Fine Grained ◽  
Grain Boundary Structure ◽  
Fine Grained Structure ◽  
The Difference ◽  
And Control

The design of microstructure in materials, ranging from ultrafine, moderately sized, duplex to single crystalline, has long been a challenging subject to material scientists. A basic means to achieve this goal is related to the control of grain growth. Taking BaTiO3 as a model system, this investigation shows that control of grain boundary structure between rough and faceted and control of initial grain size can allow us to achieve the goal. When the grain boundary is rough, normal grain growth occurs with a moderate rate. On the other hand, for faceted boundaries, either abnormal grain growth or grain growth inhibition occurs resulting in a duplex grain structure or fine-grained structure, respectively. Growth of single crystals is also possible when the boundary is faceted. During crystal growth amorphous films can form and thicken at dry grain boundaries above the eutectic temperature. As the film thickness increases, the growth rate of the crystals is reduced. This observed growth behavior of grains with boundary structure is explained in terms of the difference in mobility between the two types of boundaries. The results demonstrate the basic principles of obtaining various microstructures from the same material.

The Influence of Grain Boundary Structure on Strain-Induced Grain Growth During Superplastic Deformation

1990 ◽  
Vol 196 ◽  
Author(s):  
H. J. Frost ◽  
R. Raj
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Superplastic Deformation ◽  
Boundary Migration ◽  
Forced Migration ◽  
Grain Boundary Sliding ◽  
Boundary Structure ◽  
Grain Boundary Structure ◽  
Diffusional Flow ◽  
Boundary Sliding

ABSTRACTA model is presented to explain the grain growth that is often observed during superplastic deformation. The atomic structure of grain boundaries leads to a coupling between boundary sliding and boundary migration. There is a similar coupling between the absorption or emission of vacancies from a boundary and boundary migration. Because of these couplings, the grain boundary sliding and diffusional flow of superplastic deformation produce extensive boundary migration. We propose that this forced migration leads to random changes in the sizes of grains, and that this evolution of the grain size distribution leads to grain growth.

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