Studies of electrokinetics and grain boundary phase transition

2016 ◽  
Author(s):  
Maijia Liao
Keyword(s):  
Phase Transition ◽  
Grain Boundary ◽  
Boundary Phase

A grain boundary phase transition in Si–Au

2012 ◽  
Vol 66 (5) ◽  
pp. 203-206 ◽  
Author(s):  
Shuailei Ma ◽  
Kaveh Meshinchi Asl ◽  
Chookiat Tansarawiput ◽  
Patrick R. Cantwell ◽  
Minghao Qi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Grain Boundary ◽  
Boundary Phase

Hysteresis of grain boundary mobility due to grain boundary phase transitions.

2020 ◽  
pp. 2-6
Author(s):  
V.G. Sursaeva ◽  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Grain Boundary ◽  
Temperature Dependence ◽  
Grain Boundaries ◽  
Boundary Phase ◽  
Boundary Mobility ◽  
Grain Boundary Mobility ◽  
Arrhenius Dependence ◽  
Half Loop

The paper presents experimental results of studying the motion of individual special tilt grain boundaries in the form of a half-loop with a facet. There is a deviation of temperature dependence of grain boundary mobility from Arrhenius dependence. This behavior is interpreted as a manifestation of grain boundary mobility hysteresis due to the faceting-defaceting phase transition. The values of the temperature of the faceting - defaceting phase transitions and the hysteresis parameters of grain boundary mobility were determined experimentally for the studied individual boundaries.

scholarly journals A grain boundary phase transition studied by molecular dynamics

1987 ◽  
Vol 35 (11) ◽  
pp. 2719-2730 ◽  
Author(s):  
P. Deymier ◽  
A. Taiwo ◽  
G. Kalonji
Keyword(s):  
Phase Transition ◽  
Molecular Dynamics ◽  
Grain Boundary ◽  
Boundary Phase

Evidence for grain boundary phase transition in a 2d bicrystal

1983 ◽  
Vol 17 (7) ◽  
pp. 915-918 ◽  
Author(s):  
Francisco Carrion ◽  
Gretchen Kalonji ◽  
Sidney Yip
Keyword(s):  
Phase Transition ◽  
Grain Boundary ◽  
Boundary Phase

Examination of Fracture Interfaces in Silicon Nitride

1975 ◽  
Vol 33 ◽  
pp. 60-61
Author(s):  
Nancy J. Tighe
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Slow Crack Growth ◽  
Ceramic Materials ◽  
Grain Boundary Sliding ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

Characterization of intergranular cuprous oxide in polycrystalline YBa2Cu3O7-x

1988 ◽  
Vol 46 ◽  
pp. 880-881
Author(s):  
Bradley L. Thiel ◽  
Chan Han R. P. ◽  
Kurosky L. C. Hutter ◽  
I. A. Aksay ◽  
Mehmet Sarikaya
Keyword(s):  
Grain Boundary ◽  
Cuprous Oxide ◽  
Room Temperature ◽  
Boundary Phase ◽  
Spectroscopic Techniques ◽  
Transition Width ◽  
Practical Applications ◽  
Thin Foils ◽  
Superconducting Oxides

The identification of extraneous phases is important in understanding of high Tc superconducting oxides. The spectroscopic techniques commonly used in determining the origin of superconductivity (such as RAMAN, XPS, AES, and EXAFS) are surface-sensitive. Hence a grain boundary phase several nanometers thick could produce irrelevant spectroscopic results and cause erroneous conclusions. The intergranular phases present a major technological consideration for practical applications. In this communication we report the identification of a Cu2O grain boundary phase which forms during the sintering of YBa2Cu3O7-x (1:2:3 compound).Samples are prepared using a mixture of Y2O3. CuO, and BaO2 powders dispersed in ethanol for complete mixing. The pellets pressed at 20,000 psi are heated to 950°C at a rate of 5°C per min, held for 1 hr, and cooled at 1°C per min to room temperature. The samples show a Tc of 91K with a transition width of 2K. In order to prevent damage, a low temperature stage is used in milling to prepare thin foils which are then observed, using a liquid nitrogen holder, in a Philips 430T at 300 kV.

Change in grain-boundary ensemble upon the A1 → L12 phase transition in Ni3Mn alloy

2012 ◽  
Vol 76 (7) ◽  
pp. 836-839 ◽  
Author(s):  
E. V. Konovalova ◽  
O. B. Perevalova ◽  
N. A. Koneva ◽  
K. V. Ivanov ◽  
E. V. Kozlov
Keyword(s):  
Phase Transition ◽  
Grain Boundary

Quasi-crystalline grain-boundary phase in the magnesium die-cast alloy ZA85

2001 ◽  
Vol 45 (5) ◽  
pp. 517-524 ◽  
Author(s):  
M Vogel ◽  
O Kraft ◽  
G Dehm ◽  
E Arzt
Keyword(s):  
Grain Boundary ◽  
Cast Alloy ◽  
Boundary Phase ◽  
Die Cast
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