Orientation Correlation during α→β Up-Transformation Induced by Electric Current Pulses in a Cu-Zn Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 2406-2409
Author(s):  
Xiang Zhao ◽  
Xin Li Wang ◽  
Dong Xue Li ◽  
Wen Bin Dai
Keyword(s):  
Electric Current ◽  
Orientation Relationship ◽  
Electron Backscatter Diffraction ◽  
Current Pulses ◽  
Α Phase ◽  
Electric Current Pulses ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
The Relationship ◽  
Zn Alloy

In this work, the orientation of the β variants within a single parent α grain on the α→β up-transformation induced by electric current pulses in a Cu-Zn alloy was investigated. Electron backscatter diffraction (EBSD) was used to determine the relationship between the α phase and the β variants. By EBSD analysis, it was found that crystallographic variant selection was observed not only across those prior α/α grain boundaries, but also within the α grain interior. Results revealed that the orientation relationship between the α phase and the β associated with nucleation from α phase was close to the Kurdjumov-Sachs (K-S) orientation relationship, which better described the orientation relationship for α nucleation within β grains.

β‘ Phase Precipitation in a Cold Rolled Cu-Zn Alloy under Electric Current Pulses

2011 ◽  
Vol 197-198 ◽  
pp. 692-695 ◽  
Author(s):  
Xin Li Wang ◽  
Wen Bin Dai ◽  
Yan Lu ◽  
Shi Yang He ◽  
Xiang Zhao
Keyword(s):  
Electric Current ◽  
Rolling Direction ◽  
High Density ◽  
Phase Precipitation ◽  
Β Phase ◽  
Current Pulses ◽  
Α Phase ◽  
Electric Current Pulses ◽  
Cold Rolled ◽  
Zn Alloy

β' phase precipitation in a cold rolled Cu-Zn alloy under high density electric current pulses was studied in the present work. The results showed that the precipitation of β' phase was controlled by the angle between the current direction and rolling direction. When the angle was 45º, the application of electric current could refine α phase without β' phase precipitation, while at 0º or 90º, β' phase precipitated from α phase boundaries and distributed along the rolled direction. It was proposed that the precipitation of β' phase during the application of high density electric current was determined by the electron wind force and anisotropic electrical resistivity of the grain boundaries.

Inherited Fabric in an Omphacite Symplectite: Reconstruction of Plastic Deformation under Ultra-High Pressure Conditions

2013 ◽  
Vol 19 (4) ◽  
pp. 942-949 ◽  
Author(s):  
Florian Heidelbach ◽  
Michael P. Terry
Keyword(s):  
Orientation Relationship ◽  
Electron Backscatter Diffraction ◽  
Pure Shear ◽  
Additional Component ◽  
Western Gneiss Region ◽  
Crystallographic Preferred Orientation ◽  
Ultra High Pressure ◽  
Shear Component ◽  
Electron Backscatter ◽  
Backscatter Diffraction

AbstractWe investigated an eclogitic gneiss from the Western Gneiss Region in Norway, which underwent subduction as part of Baltica lithosphere beneath Laurentia during the Scandian orogeny. Petrologic data indicate that the eclogite was deformed plastically at about 4 GPa and 800°C producing a strong macroscopic foliation and lineation. Whereas garnet remained largely stable during the retrograde uplift, omphacite was transformed statically into a symplectite consisting of lamellar diopside and plagioclase with more equant grains of hornblende and orthopyroxene. Measurements of the crystallographic preferred orientation with electron backscatter diffraction show that diopside and hornblende, as well as orthopyroxene, have a systematic orientation relationship with the macroscopic fabric, as well as the (presumed) orientation of the host omphacite. The orientation relationship between the chain silicates is very sharp with the crystallographic forms {100}, {010}, and ⟨001⟩ being parallel. Their bulk texture shows a maximum of ⟨001⟩ parallel to the lineation and girdles of {010} and {110} perpendicular to the lineation with maxima subparallel to the foliation corresponding to an L-type texture of the original omphacite and indicating constrictional strain with an additional component of pure shear/simple shear component.

Oriented nanotwins induced by electric current pulses in Cu–Zn alloy

2007 ◽  
Vol 91 (16) ◽  
pp. 163112 ◽  
Author(s):  
X. L. Wang ◽  
Y. B. Wang ◽  
Y. M. Wang ◽  
B. Q. Wang ◽  
J. D. Guo
Keyword(s):  
Electric Current ◽  
Current Pulses ◽  
Electric Current Pulses ◽  
Zn Alloy

Plagioclase twins in a basalt: an electron backscatter diffraction study

2016 ◽  
Vol 49 (6) ◽  
pp. 2145-2154 ◽  
Author(s):  
Chang Xu ◽  
Shan-Rong Zhao ◽  
Chuan Li ◽  
Xu He
Keyword(s):  
Alkali Basalt ◽  
Microprobe Analysis ◽  
Electron Backscatter Diffraction ◽  
Subsequent Transformation ◽  
Pole Figures ◽  
Growth History ◽  
Electron Backscatter ◽  
Crystallization Conditions ◽  
Backscatter Diffraction ◽  
The Relationship

Twins in plagioclase, which are abundant in rocks, have important implications for the growth history and subsequent transformation. There are many twin laws in plagioclase and some of them are difficult to identify. This paper presents an electron backscatter diffraction (EBSD) analysis combined with electron microprobe analysis of plagioclase twinning in the Niutoushan alkali basalt. Theoretical pole figures of 12 different twin laws for plagioclase were generated. By comparing the pole figures obtained from EBSD with the theoretical ones, 11 twin laws have been identified in the alkali basalt, and their frequency has also been determined: Albite (28%), Carlsbad (25%), Albite–Carlsbad (34%), Pericline (3%), Ala (2%), Manebach (1%), Albite–Ala (1%), Prism {110} (2%), Prism {1\bar 10} (1%), Prism {130} (1%) and Prism {1\bar 30} (1%). All the plagioclase twins in the alkali basalt are growth twins. The anorthite content of the plagioclase has a negative correlation with the frequency of the Pericline and Albite twin laws but a positive correlation with the frequency of all the other twin laws, which is consistent with previous results. The theoretical pole figures of twin laws for plagioclase introduced in this paper can be applied to investigating plagioclase twin laws in all plagioclase-bearing rocks, and the relationship between twin pattern and crystallization conditions of the rocks can be established.

Segregation of lead in Cu–Zn alloy under electric current pulses

2006 ◽  
Vol 89 (6) ◽  
pp. 061910 ◽  
Author(s):  
X. L. Wang ◽  
J. D. Guo ◽  
Y. M. Wang ◽  
X. Y. Wu ◽  
B. Q. Wang
Keyword(s):  
Electric Current ◽  
Current Pulses ◽  
Electric Current Pulses ◽  
Zn Alloy

Enhanced phase transformation and variant selection by electric current pulses in a Cu–Zn alloy

2014 ◽  
Vol 29 (8) ◽  
pp. 975-980 ◽  
Author(s):  
Xinli Wang ◽  
Wenbin Dai ◽  
Rui Wang ◽  
Xinzhong Tian ◽  
Xiang Zhao
Keyword(s):  
Phase Transformation ◽  
Electric Current ◽  
Variant Selection ◽  
Current Pulses ◽  
Electric Current Pulses ◽  
Image Position ◽  
Zn Alloy

Abstract

Electron backscatter diffraction study of twins and intergrowths among quartz crystals in granite

2013 ◽  
Vol 46 (5) ◽  
pp. 1414-1424 ◽  
Author(s):  
Shan-Rong Zhao ◽  
Hai-Jun Xu ◽  
Qin-Yan Wang ◽  
Kun-Guang Yang
Keyword(s):  
Crystallographic Orientation ◽  
Electron Backscatter Diffraction ◽  
Twin Plane ◽  
The Other ◽  
Mountain Area ◽  
Quartz Crystals ◽  
Dabie Mountain ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
The Relationship

Quartz has various types of twin law and twinned quartz is more common than untwinned quartz. However, it is difficult to determine the twin laws of quartz by optical or diffraction methods, so the distribution of the different twin laws of quartz in rocks is still unknown. This paper introduces a method to determine quartz twin laws using electron backscatter diffraction (EBSD). Based on this method, the relationships between quartz crystals in the granite of Tiantangzhai pluton, located at the centre of the Dabie Mountain area, China, are analysed. It is found that the Dauphiné twin is very abundant but the other twin laws (Japan, Esterel, Sardinian, Breithaupt and Cornish) are very rare in this granite. Besides twin laws, many kinds of intergrowths among the quartz crystals are also found. In the intergrowths the overlapping faces are {11\overline 22}, {10\overline 11}, {10\overline 12}, {11\overline 21} and {20\overline 21}, which are simply the twin planes of the Japan, Esterel, Sardinian, Breithaupt and Cornish twin laws, respectively. It is interesting that quartz crystals like to form intergrowths based on these faces but do not like to form twins with these faces as a twin plane. This research shows that the relationship between quartz crystals in the granite is controlled by the crystallographic orientation, resulting in the twins and intergrowths occurring at frequencies far exceeding random contact. It is also suggested that EBSD is the best method to determine the twin laws and intergrowths of quartz in a rock.

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