Morphological evolution and growth mechanism of primary Mg2Si phase in Al–Mg2Si alloys

2011 ◽  
Vol 59 (3) ◽  
pp. 1058-1067 ◽  
Author(s):  
C. Li ◽  
Y.Y. Wu ◽  
H. Li ◽  
X.F. Liu
Keyword(s):  
Growth Mechanism ◽  
Morphological Evolution ◽  
Mg2si Phase ◽  
Primary Mg2si

Effects of Mg content on primary Mg2Si phase in hypereutectic Al–Si alloys

2015 ◽  
Vol 25 (10) ◽  
pp. 3197-3203 ◽  
Author(s):  
Zhi-li HUANG ◽  
Kai WANG ◽  
Zhi-ming ZHANG ◽  
Bo LI ◽  
Han-song XUE ◽  
...  
Keyword(s):  
Mg2si Phase ◽  
Primary Mg2si ◽  
Mg Content

scholarly journals Morphological evolution of ternary InxGa1-xAs nanowires (NWs) grown with Au particle-assisted using vertical chamber MOCVD

2014 ◽  
Vol 6 (2) ◽  
Author(s):  
Edy Wibowo ◽  
Zulkafli Othaman ◽  
Samsudi Sakrani ◽  
Amira S. Ameruddin ◽  
Didik Aryanto ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Chemical Composition ◽  
Growth Mechanism ◽  
Strong Influence ◽  
Morphological Evolution ◽  
Sem Images ◽  
Temperature Changes ◽  
X Ray ◽  
Undoped Gaas ◽  
Scanning Electron

The morphology and chemical composition of InxGa1-xAs NWs grown on undoped GaAs (111)B substrate have been investigated using scanning electron microscopy (SEM) and energy dispersive x-ray (EDX), respectively. SEM images show that InxGa1-xAs NWs underwent morphological evolution as temperature changes. By changing the growth temperature, the growth mechanism of NWs was assumed to have changed. Both characterizations results suggested the growth mechanism has strong influence to the evolution of the NWs morphologies and also to the distribution of the chemical composition of NWs.

Montmorillonite Dendrites

1974 ◽  
Vol 32 ◽  
pp. 454-455
Author(s):  
Necip Güven ◽  
Rodney W. Pease
Keyword(s):  
Crystal Growth ◽  
Growth Mechanism ◽  
Growth Front ◽  
Morphological Features ◽  
Dendritic Crystal ◽  
Crystal Growth Mechanism

Morphological features of montmorillonite aggregates in a large number of samples suggest that they may be formed by a dendritic crystal growth mechanism (i.e., tree-like growth by branching of a growth front).

Structural phenomena in the growth of carbon nanotubes

1993 ◽  
Vol 51 ◽  
pp. 750-751
Author(s):  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Carbonaceous Material ◽  
Cluster Growth ◽  
Structural Elements ◽  
Rich Variety ◽  
Different Shapes ◽  
Point To Point

HREM studies of the carbonaceous material deposited on the cathode of a Huffman-Krätschmer arc reactor have shown a rich variety of multiple-walled nano-clusters of different shapes and forms. The preparation of the samples, as well as the variety of cluster shapes, including triangular, rhombohedral and pentagonal projections, are described elsewhere.The close registry imposed on the nanotubes, focuses attention on the cluster growth mechanism. The strict parallelism in the graphitic separation of the tube walls is maintained through changes of form and size, often leading to 180° turns, and accommodating neighboring clusters and defects. Iijima et. al. have proposed a growth scheme in terms of pentagonal and heptagonal defects and their combinations in a hexagonal graphitic matrix, the first bending the surface inward, and the second outward. We report here HREM observations that support Iijima’s suggestions, and add some new features that refine the interpretation of the growth mechanism. The structural elements of our observations are briefly summarized in the following four micrographs, taken in a Hitachi H-8100 TEM operating at an accelerating voltage of 200 kV and with a point-to-point resolution of 0.20 nm.

A quantitative image analysis method for the determination of cocontinuity in polymer blends

1993 ◽  
Vol 51 ◽  
pp. 894-895
Author(s):  
William A. Heeschen
Keyword(s):  
Image Analysis ◽  
Polymer Blends ◽  
Quantitative Measurement ◽  
Morphological Evolution ◽  
Phase Ratio ◽  
Irregular Shapes ◽  
Quantitative Image ◽  
Discrete Domains ◽  
A Domains

Two new morphological measurements based on digital image analysis, CoContinuity and CoContinuity Balance, have been developed and implemented for quantitative measurement of morphology in polymer blends. The morphology of polymer blends varies with phase ratio, composition and processing. A typical morphological evolution for increasing phase ratio of polymer A to polymer B starts with discrete domains of A in a matrix of B (A/B < 1), moves through a cocontinuous distribution of A and B (A/B ≈ 1) and finishes with discrete domains of B in a matrix of A (A/B > 1). For low phase ratios, A is often seen as solid convex particles embedded in the continuous B phase. As the ratio increases, A domains begin to evolve into irregular shapes, though still recognizable as separate domains. Further increase in the phase ratio leads to A domains which extend into and surround the B phase while the B phase simultaneously extends into and surrounds the A phase.

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