By Sidney H. Avner
The most principles and purposes of the metallurgy are supplied during this publication.
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The most rules and functions of the metallurgy are supplied during this booklet.
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C. structure. " Amerbcan Society for Metals. Metals Park. Ohro. 15 Close-packed Hexagonal The usual picture of the close-pacited hexagonal lattice shows two basal planes in the form of regular hexagons with an atom at each corner of the hexagon and one atom at the center. In addition, there are three atoms in the form Of a triangle midway between the two basal planes. If the basal plane is divided into six equilateral triangles, the additional three atoms are nestled In the center of alternate equilateral triangles (Fig.
33. All machine parts that have been magnetized for inspectior; must be put through a demagnetizing operation. If these parts are placed in service without demagnetizing, they will attract filings, grindings, chips, and other steel particles which may cause scoring of bearings and other engine parts. Detection of parts which have not been demagnetized is usually accomplished by keeping a compass on the assembly bench. 39 Fluorescent-penetrant Inspection (Zyglo) This is a sensitive nondestructive method of detecting minute discontinuities such as cracks, shrinkage, and porosity that are open to the surface.
Z + * + E * +5 U CO 9 N b 7 2,j7 Crystallographic Planes The layers of atoms or the planes along which atoms are arranged are known as atomlc or crystallographic planes. The relation of a set of planes to the axes of the unit cell is designated by Miller indices. One corner of the unit cell is assumed to be the origin of the space coordinates, and any set of planes is identified by the reciprocals of its intersections with these coordinates. The unit of the coordinates is the lattice parameter of the crystal.