Analysis of mark-formation process for phase-change media

1998 ◽  
Vol 4 (5) ◽  
pp. 826-831 ◽  
Author(s):  
M. Miyamoto ◽  
A. Hirotsune ◽  
Y. Miyauchi ◽  
K. Ando ◽  
M. Terao ◽  
...  
Keyword(s):  
Phase Change ◽  
Formation Process

Coupled Simulation on Temperature Field and Microstructure Formation Process of K4169 Superalloy Blade in Investment Casting

2012 ◽  
Vol 217-219 ◽  
pp. 330-333
Author(s):  
Han Wu Liu ◽  
Hong De Ren ◽  
De Chao Dong
Keyword(s):  
Temperature Field ◽  
Phase Change ◽  
Formation Process ◽  
Mechanical Performance ◽  
Grain Structure ◽  
Solute Diffusion ◽  
Heat Radiation ◽  
Transient Temperature ◽  
Time Step ◽  
Temperature State

In order to control the grain structure of K4169 superalloy blade which affects its mechanical performance and ability of resistance to corroding in high temperature state, the transient temperature field distributions were analyzed by using equivalent thermal entropy method with the consideration of the practical boundary conditions, such as, heat exchange and heat radiation in solidification, and the relationships between temperature and time of every point on vertical section and cross section during phase change heat transference process of K4169 superalloy were obtained. The changes of solid phase fraction after every time step were calculated basing on the model of equiaxed dendrite growth solute diffusion put forward by Rappaz and other persons. we used the data to modify the temperature in the same step when phase change latent heat was released. The Cell Automaton technology was adopted to coupled simulate the grain structure formation process of K4169 superalloy blade with its temperature fields using continuous nucleation model and kinetic model of dendrite tip growth. These simulation results which coincided much well with the ones of experiment test have played a very important role in studying superalloy mechanical performance and ability of resistance to corroding of K4169 alloy blades.

A study of the mixture formation process of a diesel spray under phase change

2007 ◽  
Vol 21 (7) ◽  
pp. 1120-1128 ◽  
Author(s):  
Jeongkuk Yeom ◽  
Jongsang Park ◽  
Sipom Kim ◽  
Jongyul Ha ◽  
Sungsik Chung ◽  
...  
Keyword(s):  
Phase Change ◽  
Formation Process ◽  
Diesel Spray ◽  
Mixture Formation

Formation process of periodic non-conservative antiphase boundary structure in L-Pd5Ce

1990 ◽  
Vol 48 (4) ◽  
pp. 162-163
Author(s):  
Masaru Itakura ◽  
Noriyuki Kuwano ◽  
Kensuke Oki
Keyword(s):  
Formation Process ◽  
Domain Size ◽  
Antiphase Boundary ◽  
Boundary Structure ◽  
Temperature Phase ◽  
Arc Melting ◽  
Iced Water ◽  
Antiphase Domains ◽  
Low Temperature Phase ◽  
Degree Of Order

The low temperature phase of Pd5Ce (L-Pd5Ce) has a one-dimensional long period superstructure (1D-LPS) derived from Ll2. The periodic antiphase boundaries (APBs) are parallel to (110) planes and have a shift vector of 1/2[110]. Hereafter, the indices are referred to the basic lattices of Ll2 As insertion of the APB causes a change in composition, such an APB is called “non-conservative”. Then, a domain size M depends upon the Ce concentration in the alloy. It was found that M increases also with temperature. The temperature dependency of M is attributed to a change of the degree of order within the antiphase domains. In this work, morphology of the non-conservative APBs is observed to clarify the formation process of the 1D-LPS.The alloy of Pd-16.7 at%Ce was prepared by arc melting in argon atmosphere. Disc specimens made from the alloy ingot were first held at 985 K for 260 ks and quenched in iced water to obtain the state of M=∞ or Ll2, followed by annealing for various lengths of time. The annealing temperature was 873 K where the equilibrium value for M is about 3 in unit of (110) lattice spacing of Ll2. Observation was carried out using microscopes JEM-2000FX, JEM-4000EX (HVEM Lab., Kyushu Univ.) and JEM-2000EX (Dept. of Mater. Sci. Tech., Kyushu Univ.).

The effect of an aluminum heat-sink layer on the laser-induced amorphization of SiOx/TeGeSn/SiOx phase-change recording films

1989 ◽  
Vol 47 ◽  
pp. 574-575
Author(s):  
Matthew R. Libera ◽  
Martin Chen
Keyword(s):  
Thin Film ◽  
Phase Change ◽  
Heat Sink ◽  
Multilayer Film ◽  
Glassy Phase ◽  
Film Structure ◽  
Glass Forming ◽  
Active Storage ◽  
Dielectric Layers ◽  
Amorphous States

Phase-change erasable optical storage is based on the ability to switch a micron-sized region of a thin film between the crystalline and amorphous states using a diffraction-limited laser as a heat source. A bit of information can be represented as an amorphous spot on a crystalline background, and the two states can be optically identified by their different reflectivities. In a typical multilayer thin-film structure the active (storage) layer is sandwiched between one or more dielectric layers. The dielectric layers provide physical containment and act as a heat sink. A viable phase-change medium must be able to quench to the glassy phase after melting, and this requires proper tailoring of the thermal properties of the multilayer film. The present research studies one particular multilayer structure and shows the effect of an additional aluminum layer on the glass-forming ability.

Effect of mood on stereotype formation process

2004 ◽  
Author(s):  
Julia Braverman ◽  
David DeSteno
Keyword(s):  
Formation Process
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