Effects of Point Defects Caused by Intersected Cross Slip among Dislocations upon Longitudinal Wave Velocity : Experimental Verification under Pure Shear Plastic Deformation of Pure Al Single Crystal

2004 ◽  
Vol 2004 (0) ◽  
pp. 547-548
Author(s):  
M. KOBAYASHI ◽  
S. MIURA ◽  
S. TANG ◽  
N. Aoyama
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Point Defects ◽  
Experimental Verification ◽  
Pure Shear ◽  
Cross Slip ◽  
Longitudinal Wave Velocity

Ultrasonic Study on Crystal Orientation Effects Upon Point Defect Growth Caused by Cross Slip Under Plastic Deformation

2004 ◽  
Author(s):  
Michiaki Kobayashi
Keyword(s):  
Plastic Deformation ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Crystal Orientation ◽  
Pure Shear ◽  
Cross Slip ◽  
Polished Surface ◽  
Longitudinal Wave Velocity ◽  
Velocity Change ◽  
Change Tendency

Concerned with the longitudinal wave velocity changes under plastic deformation in pure shear state, the experimental results of longitudinal wave velocity are categorized to two types: (i) simple decreasing change tendency at polished surface specimens, and (ii) chaotic change tendency at unpolished surface specimens. In the present paper, the effects of surface roughness and crystal orientation on the amount of cross slip under plastic deformation are studied via finite element polycrystal model (FEPM) from the viewpoint of longitudinal wave velocity change showing a sensitive response to the point defects caused by cross slip.

Dependence of Localized Deformation on Point Defect Development Caused by Intersected Cross Slip among Dislocations

2007 ◽  
Vol 340-341 ◽  
pp. 193-198 ◽  
Author(s):  
Michiaki Kobayashi ◽  
Naohiro Aoyama ◽  
Shou Hashiba ◽  
Setsuo Miura ◽  
Junichi Shibano
Keyword(s):  
Plastic Deformation ◽  
Point Defect ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Pure Shear ◽  
Pure Aluminum ◽  
Cross Slip ◽  
Longitudinal Wave Velocity ◽  
Localized Deformation ◽  
Aluminum Single Crystal

In this paper, via experimental results of ultrasonic wave velocity changes and FEPM simulations of slip system under the pure shear plastic deformation of a pure Aluminum single crystal, the authors verify that the ultrasonic longitudinal wave velocity depends upon the development of point defects caused by intersected cross slip among dislocations and also examine the correlation of the point defect dependence of the longitudinal wave velocity with the elastic stiffness degradation due to plastic deformation damage which is closely related to the deformation instability mechanism.

Determining the Thermal Shock Elastic Behavior of Mullite Ceramic Regenerator Material by Ultrasonic Testing

2014 ◽  
Vol 633 ◽  
pp. 472-475 ◽  
Author(s):  
Tian Tian Sun ◽  
Yan Xia Wang ◽  
Hai Yun ◽  
Dong Huan Zhang ◽  
Qing Hui Shang
Keyword(s):  
Thermal Shock ◽  
Longitudinal Wave ◽  
Shear Wave ◽  
Wave Velocity ◽  
Temperature Difference ◽  
Shear Wave Velocity ◽  
Modulus Of Elasticity ◽  
Longitudinal Wave Velocity ◽  
Mullite Ceramic ◽  
Mullite Ceramics

Mullite material is a material commonly used in honeycomb regenerator, because in the process of using material under big temperature difference effect, so have a great demand for its thermal shock resistance. The used mullite ceramics were made by the direct solid phase sintering method, and the modulus of elasticity of the mullite ceramics measured by ultrasonic pulse-echo method in a thermal shock and thermal fatigue experiment, respectively. In the air-cooling condition, the study found the mullite ceramic without thermal shock that the longitudinal wave velocity and shear wave velocity respectively 3970(m/s) and 2492(m/s). After 45 times thermal shock of temperature difference of 800°C, longitudinal wave velocity and shear wave velocity decreased to 3910(m/s) and 2457(m/s), and the value of the modulus of elasticity changed 1020MPa. By observing the change of the elastic modulus value rule, can know the elastic deformation of thermal shock on the material performance of thermal shock damage. Moreover, the results can provide the data basis for the calculation of the residual strength and the numerical simulation of thermal stress.

scholarly journals Texture and Cross Slip Effects on Ultrasonic Wave Velocity Changes Under Simple and Pure Shear States.

2001 ◽  
Vol 67 (660) ◽  
pp. 1402-1408 ◽  
Author(s):  
Shihua TANG ◽  
Michiaki KOBAYASHI ◽  
Setsuo MIURA ◽  
Hiroryuki FUJIKI ◽  
Kazuya IWABUCHI ◽  
...  
Keyword(s):  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Pure Shear ◽  
Cross Slip ◽  
Ultrasonic Wave Velocity ◽  
Slip Effects ◽  
Velocity Changes
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