Firstly, the mold is designed to completely solidify and form an appropriate grain structure required for later processing, as the structure formed by the freezing melt controls the physical properties of the material.
42.
Reducing the onset and the rate of crystallization, minimizing the volume fraction of microcrystallinity and maintaining a homogeneous grain structure at higher bake temperatures are key requirements for optimization of the films thermomagnetic performance.
43.
His work often features very vivid blues and yellows which often take up most of the image, and the film's grain structure often switches between well-defined and sharp, and somewhat smoothed over or very fine.
44.
In either case, because of the grain structure of the metal and its resistance to the side-to-side motions of the recording stylus, significant surface noise was inherent and the high-frequency signal content was heavily attenuated.
45.
To perform a full anneal on a steel for example, steel is heated to slightly above the austenitic temperature and held for sufficient time to allow the material to fully form austenite or austenite-cementite grain structure.
46.
In a " solid state bond ", also called a thermo-compression bond, dissimilar materials with dissimilar grain structure, e . g . molybdenum to tungsten, are joined using a very short heating time, high weld energy, and high force.
47.
Olivine, chromite, etc . are therefore used because they do not have a phase transition that causes rapid expansion of the grains, as well as offering greater density, which cools the metal faster, producing finer grain structures in the metal.
48.
If aluminium is present, a manganese component is almost always also present at about 0.2 % by weight which serves improve grain structure; if aluminum and manganese are absent, zirconium is usually present at about 0.8 % for this same purpose.
49.
The result was directional solidification processing in which grain boundaries were eliminated by producing columnar grain structures aligned parallel to the axis of the blade, since this is usually the direction of maximum tensile stress felt by a blade during its rotation in an airplane.
50.
Now assuming that the grains only grow due to the influence of curvature, the driving force of growth is \ frac { 2 \ lambda } { R } where ( for homogeneous grain structure ) R approximates to the mean diameter of the grains.
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