scholarly journals Crystallography Analysis of the β-Mg17Al12 Precipitates by the Secondary Constrained Coincident Site Lattice Model

2015 ◽  
Vol 45 (4) ◽  
pp. 230-235
Author(s):  
Xuefei Huang ◽  
Weigang Huang
Keyword(s):  
Lattice Model ◽  
Coincident Site Lattice ◽  
Site Lattice

Nanocluster Epitaxy by Annealing: Ag on H-terminated Si (111) Surfaces

2002 ◽  
Vol 749 ◽  
Author(s):  
B.Q. Li ◽  
Y.F. Shi ◽  
J. Bording ◽  
J.M. Zuo
Keyword(s):  
Experimental Investigation ◽  
Single Crystal ◽  
Lattice Model ◽  
Energy Minimization ◽  
Coincident Site Lattice ◽  
Interface Energy ◽  
Site Lattice ◽  
Plane Orientation ◽  
Ag Clusters ◽  
Ag Nanoclusters

ABSTRACTWe report an experimental investigation on the morphology and orientation of Ag nanoclusters by RT deposition and subsequent annealing. We show that epitaxial Ag clusters of 2 ∼ 6 nm in diameter can be synthesized in this way. The RT self-assembled Ag clusters grow as mostly single-crystal crystallites with Ag(111)//Si(111), but the in-plane orientation has a dispersion of ∼ 9° centering at Si[110] direction. Upon annealing, the Ag clusters drastically rotated to the epitaxial configuration with the in-plane orientation aligned to the Ag[110] //Si[110] direction. The rotation and epitaxy of the Ag nanoclusters are explained based on a coincident site lattice model and interface energy minimization.

The orientation relationships of nanobelt-like Si2Hf precipitates in an Al–Si–Mg–Hf alloy

2016 ◽  
Vol 49 (4) ◽  
pp. 1223-1230 ◽  
Author(s):  
Xueli Wang ◽  
Huilan Huang ◽  
Xinfu Gu ◽  
Yanjun Li ◽  
Zhihong Jia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Coincident Site Lattice ◽  
Orthorhombic Structure ◽  
Orientation Relationships ◽  
Lattice Distribution ◽  
Site Lattice ◽  
Transmission Electron ◽  
Habit Planes ◽  
Al Matrix

The orientation relationships (ORs) between the Al matrix and Si2Hf precipitates with an orthorhombic structure in an Al–Si–Mg–Hf alloy after heat treatment at 833 K for 20 h were investigated by transmission electron microscopy and electron diffraction. Four ORs are identified as (100)Al||(010)p, (0\overline {1}1)Al||(101)pand [011]Al||[\overline {1}01]p; (11\overline {1})Al||(010)pand [011]Al||[\overline {1}01]p; (12\overline {1})Al||(010)p, (101)Al||(100)pand [1\overline {11}]Al||[001]p; (\overline {11}1)Al||(010)pand [112]Al||[\overline {1}01]p. The habit planes of these four ORs are rationalized by the fraction of good atomic matching sites at the interface. In addition, the formation of Si2Hf precipitates with a nanobelt-like morphology is interpreted on the basis of the near-coincident site lattice distribution.

scholarly journals Effects of thermomechanical treatment on the occurrence of coincident site lattice boundaries in high strength low alloy steel

2013 ◽  
Vol 16 (6) ◽  
pp. 1350-1354 ◽  
Author(s):  
Renato Soares de Castro ◽  
Ricardo Artur Sanguinetti Ferreira ◽  
Igor Rafael Vilarouco Pedrosa ◽  
Yogendra Prasad Yadava
Keyword(s):  
Alloy Steel ◽  
Thermomechanical Treatment ◽  
Coincident Site Lattice ◽  
High Strength ◽  
Low Alloy Steel ◽  
Site Lattice

Fracture Strengths of Individual Grain Boundaries in Ni3Ai Using a Miniaturized Disk Bend Test

1991 ◽  
Vol 238 ◽  
Author(s):  
Douglas E. Meyers ◽  
Alan J. Ardell
Keyword(s):  
Plastic Deformation ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Grain Growth ◽  
Coincident Site Lattice ◽  
Bend Test ◽  
High Angle ◽  
Load Drop ◽  
Site Lattice ◽  
Special Boundaries

ABSTRACTThe results of our initial efforts at measuring the fracture strengths of grain boundaries In Ni3Al using a miniaturized disk-bend test are presented. The samples tested were 3 mm in diameter and between 150 and 300 μm thick. An Ingot of directlonally-solidlfled, boron-free Ni3Al containing 24% Al was annealed between 1300 and 1350 °C to induce grain growth, producing many grain boundaries In excess of 1.5 mm in length. Specimens were cut from these In such a way that one long grain boundary was located near a diameter of the specimen. The relative orientations of the grains on either side of the boundary were determined from electron channeling patterns. Low-angle boundaries are so strong they do not fracture; Instead the samples deform In a completely ductile manner. High-angle boundaries always fracture, but only after considerable plastic deformation of the two grains flanking them. Fracture is Indicated by a load drop in the load vs. displacement curves. A method involving extrapolation of the elastic portion of these curves to the displacement at fracture is used to estimate the fracture stresses. This procedure yields consistent values of the fracture strengths of high-angle boundaries. The measured stresses are large (∼2 to 3 GPa), but considerably smaller than those required for the fracture of special boundaries, as predicted by computer simulations. No correlation was found between the fracture stresses or loads and the geometry of the high-angle boundaries, many of which are close to, but deviate from, coincident site lattice orientations.

Dissociated and faceted large-angle coincident-site-lattice boundaries in silicon

1989 ◽  
Vol 59 (3) ◽  
pp. 479-499 ◽  
Author(s):  
A. Garg ◽  
W. A. T. Clark ◽  
J. P. Hirth
Keyword(s):  
Large Angle ◽  
Coincident Site Lattice ◽  
Site Lattice

Representation of grain misorientations (mesotexture) in Rodrigues-Frank space

1990 ◽  
Vol 431 (1881) ◽  
pp. 61-69 ◽  
Keyword(s):  
Coincident Site Lattice ◽  
Axial Direction ◽  
Sample Population ◽  
Experimental Sample ◽  
Site Lattice

Use of the Rodrigues vector R for representation of rotations in Rodrigues-Frank (RF) space is illustrated for the particular case of misorientations between grains in a cubic polycrystal. A subvolume of the fundamental zone of RF space is shown to be a convenient unit for the display of preferred misorientation, which here is referred to as ‘mesotexture’. When a misorientation sample population is displayed in the subvolume low angle, coincident axial direction and particularly coincident site lattice boundaries are presented with clarity thus allowing nature of the mesotexture to be assessed. Some features and properties of RF space are illustrated with reference to an experimental sample population of grain misorientations, and comparisons are made with other representation methods.

Sign in / Sign up

Export Citation Format

Share Document