The mechanism of orientation variant selection in titanium sheet

1996 ◽  
Vol 15 (9) ◽  
pp. 767-769 ◽  
Author(s):  
Z. S. Zhu ◽  
J. I. Gu ◽  
N. P. Chen ◽  
M. G. Yan
Keyword(s):  
Variant Selection ◽  
Titanium Sheet ◽  
Orientation Variant

scholarly journals A simple variant selection in stress-driven martensitic transformation

2019 ◽  
Vol 116 (30) ◽  
pp. 14905-14909 ◽  
Author(s):  
Binbin Yue ◽  
Fang Hong ◽  
Naohisa Hirao ◽  
Roman Vasin ◽  
Hans-Rudolf Wenk ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Orthorhombic Phase ◽  
Martensitic Transformations ◽  
Variant Selection ◽  
Structural Distortions ◽  
Orientation Variant ◽  
Diamond Anvil ◽  
Simple Variant ◽  
Pressure Stress

The study of orientation variant selection helps to reveal the mechanism and dynamic process of martensitic transformations driven by temperature or pressure/stress. This is challenging due to the multiple variants which may coexist. While effects of temperature and microstructure in many martensitic transformations have been studied in detail, effects of stress and pressure are much less understood. Here, an in situ variant selection study of Mn2O3 across the cubic-to-orthorhombic martensitic transformation explores orientation variants at pressures up to 51.5 GPa and stresses up to 5.5 GPa, using diamond anvil cells in radial geometry with synchrotron X-ray diffraction. The diamonds not only exert pressure but also impose stress and cause plastic deformation and texture development. The crystal orientation changes were followed in situ and a {110}c 〈001〉c // (100)o 〈010〉o relationship was observed. Only the {110}c plane perpendicular to the stress direction was selected to become (100)o, resulting in a very strong texture of the orthorhombic phase. Contrary to most other martensitic transformations, this study reveals a clear and simple variant selection that is attributed to structural distortions under pressure and stress.

Variant selection and its effect on phase transformation textures in cold rolled titanium sheet

2000 ◽  
Vol 280 (1) ◽  
pp. 199-203 ◽  
Author(s):  
Z.S Zhu ◽  
J.L Gu ◽  
R.Y Liu ◽  
N.P Chen ◽  
M.G Yan
Keyword(s):  
Phase Transformation ◽  
Variant Selection ◽  
Titanium Sheet ◽  
Cold Rolled

Investigation of the Deformation Twins on the Bending Cross Section of TA2 Titanium Sheet

2020 ◽  
Vol 837 ◽  
pp. 41-45
Author(s):  
Shuai Sun ◽  
Kai Hua Liu
Keyword(s):  
Electron Backscatter Diffraction ◽  
Testing Machine ◽  
Pure Titanium ◽  
Titanium Sheet ◽  
Bending Tests ◽  
Three Point Bending ◽  
Deformation Twins ◽  
Ebsd Technique ◽  
Backscatter Diffraction ◽  
Deformation Area

In order to determine the evolution features of deformation twins for TA2 commercial pure titanium (cp-TA2), the TA2 samples were bent under different bending angles in three-point bending tests via a universal testing machine. The electron backscatter diffraction (EBSD) technique was applied to identify the grain boundaries (GBs) and twin boundaries (TBs) in the bending areas. The results reveal that the type of deformation area would effect the evolution of different deformation twins. It is inferred that the state of stress would promote the multiplication of the same type of deformation twins.

scholarly journals Strain-induced variant selection in heterogeneous nucleation of α -Ti at screw dislocations in β -Ti

2018 ◽  
Vol 2 (8) ◽  
Author(s):  
Max Poschmann ◽  
Joseph Lin ◽  
Henry Geerlings ◽  
Ian S. Winter ◽  
D. C. Chrzan
Keyword(s):  
Heterogeneous Nucleation ◽  
Variant Selection ◽  
Screw Dislocations

Loading Mode Dependence of {$$10\bar{1}2$$} Twin Variant Selection in a Rolled Mg-Al-Zn Alloy

2021 ◽  
Author(s):  
Longhui Mao ◽  
Chuming Liu ◽  
Yingchun Wan ◽  
Tao Chen ◽  
Shunong Jiang ◽  
...  
Keyword(s):  
Variant Selection ◽  
Twin Variant ◽  
Loading Mode ◽  
Zn Alloy

scholarly journals Strain Accommodations among Twin Variants in Ti and Mg

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 453
Author(s):  
Ping Zhou ◽  
Guo-Zhen Zhu
Keyword(s):  
Mechanical Property ◽  
Great Influence ◽  
Local Strain ◽  
Deformation Texture ◽  
Variant Selection ◽  
Slip Systems ◽  
Twinning Shear ◽  
Active Variant ◽  
Shed Light ◽  
Selection Of

The selection of twin variants has a great influence on deformation texture and mechanical property in hcp metals where slip systems are limited and twinning types are abundant during deformation. Local strain accommodations among twin variants are considered to shed light on variant selection rules in Ti and Mg alloys. Five kinds of strain accommodations are discussed in terms of different regions that are affected by the twinning shear of primary twin. These regions contain (I) the whole sample, (II) neighboring grain, (III) adjacent primary twin in neighboring grain, (IV) adjoining primary twin within the same parent grain, and (V) multi-generation of twinning inside the primary twin. For a potentially active variant, its operation needs not only relatively higher resolved shear stress but also easily accommodated strain by immediate vicinity. Many of the non-Schmid behaviors could be elucidated by local strain accommodations that variants with relatively higher SFs hard to be accommodated are absent, while those with relatively lower SFs but could be easily accommodated are present.

Effects of TiB on the variant selection and spheroidization of secondary α phases at different cooling rates in TiB-TC25G composites

2021 ◽  
Vol 133 ◽  
pp. 107176
Author(s):  
H. Sun ◽  
Z.B. Zhao ◽  
Q.J. Wang ◽  
T.Y. Zhou ◽  
N. Li ◽  
...  
Keyword(s):  
Variant Selection ◽  
Cooling Rates
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