scholarly journals Dynamic evolution of deformation microstructures in rocks. Microstructures and rheology in fault rocks. Grain growth and superplasticity: their implication to earth science.

1996 ◽  
Vol 102 (3) ◽  
pp. 232-239 ◽  
Author(s):  
Akihito Hoshikuma
Keyword(s):  
Grain Growth ◽  
Earth Science ◽  
Dynamic Evolution ◽  
Fault Rocks

Simulation of the Dendritic Growth of Aluminum Casting during Solidification Based on CA Method

2010 ◽  
Vol 154-155 ◽  
pp. 376-380
Author(s):  
Xiao Bo Liu ◽  
Kai Qin Li
Keyword(s):  
Grain Growth ◽  
Casting Process ◽  
Dynamic Evolution ◽  
Aluminum Casting ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Cooling Intensity ◽  
Undercooled Melt ◽  
The Impact ◽  
Twin Roll

The dynamic evolution of grain growth in the process of aluminum casting and the impact of different casting conditions on the grain growth were simulated by using the Cellular Automation(CA) method in this paper. The simplified binary alloy was used to simulate the growth of the grain in the undercooled melt, Finite Difference Method (FDM) combined with relative motion was used, and dynamic evolution of microstructures in the process of aluminum twin-roll casting was achieved. Visual Fortran programming language was adopted to calculate and realize the image post-processing. based on the growth of the grain in the undercooled melt, the impact of the undercooling triggered by cooling and the casting speed on aluminum strip in the casting process was simulated. The results indicate that, in the condition of a certain nucleation rate, as the cooling intensity increases, bigger the grain is, which provides a basis for optimizing the twin-roll casting process parameters.

Grain Refinement in Titanium-Erbium Alloys

1974 ◽  
Vol 32 ◽  
pp. 522-523
Author(s):  
B. B. Rath ◽  
J. E. O'Neal ◽  
R. J. Lederich
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Grain Refinement ◽  
Grain Growth ◽  
Volume Fraction ◽  
Pure Titanium ◽  
Systematic Investigation ◽  
Second Phase ◽  
Titanium Matrix ◽  
Average Size

Addition of small amounts of erbium has a profound effect on recrystallization and grain growth in titanium. Erbium, because of its negligible solubility in titanium, precipitates in the titanium matrix as a finely dispersed second phase. The presence of this phase, depending on its average size, distribution, and volume fraction in titanium, strongly inhibits the migration of grain boundaries during recrystallization and grain growth, and thus produces ultimate grains of sub-micrometer dimensions. A systematic investigation has been conducted to study the isothermal grain growth in electrolytically pure titanium and titanium-erbium alloys (Er concentration ranging from 0-0.3 at.%) over the temperature range of 450 to 850°C by electron microscopy.

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

Integrating Macrostrat and Rockd into Undergraduate Earth Science Teaching

2018 ◽  
Author(s):  
Phoebe A. Cohen ◽  
Rowan Lockwood ◽  
Shanan Peters
Keyword(s):  
Science Teaching ◽  
Earth Science

Geological Katabasis : Geology and the Christian Underworld in Kingsley's The Water-Babies

2017 ◽  
Vol 7 (3) ◽  
pp. 195-209
Author(s):  
Rachel Fountain Eames
Keyword(s):  
Earth Science ◽  
Divine Comedy ◽  
The Novel ◽  
Geological Society

Charles Kingsley's lifelong interest in geology is well documented – from the gentleman geologists of his early novels and his membership of the Geological Society, to his introduction to earth science for children, Madam How and Lady Why (1870) – but the influence of geological ideas in The Water-Babies (1863) has been largely overlooked. Instead, academics have broadly categorised the novel as an ‘evolutionary parable’, emphasising Darwinian influences to the exclusion of contemporary geology. I propose that there is a distinct geological subtext underpinning The Water-Babies. Acknowledging both its scientific and religious contexts, I argue that Kingsley integrates elements of his geological studies into clear stratigraphic forms in the novel; that these ideas recur in the novel's surface geography and are informed by his reading of contemporary geologists; and that The Water-Babies is part of a longstanding generic tradition of Christian geological katabasis that can be traced back to Dante's Divine Comedy (1555).

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