Also, the direction perpendicular to this plane is a [] direction. Figure b from J. Brady and F. Senese, Chemistry: Matter and Its Changes, 4th edition. Figure e iStockphoto.

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The atomic radius of the carbon atom is much less than that for iron: 0. Solid solutions are also possible for ceramic materials, as discussed in Section The two most common ways to specify composi- tion are weight or mass percent and atom percent. The concentration of 2 would be computed in an analogous manner. Concentration in terms of atom percent of element 1 in an alloy containing element 1 and element 2 atoms, is defined by4 4.

Atom percent computations also can be carried out on the basis of the num- ber of atoms instead of moles, because one mole of all substances contains the same number of atoms. We will now present equations for making these conversions in terms of the two hypothetical elements 1 and 2. Using the convention of the previous section i. Concentrations in terms of this basis will be denoted using a double prime i. Furthermore, on occasion we desire to determine the density and atomic weight of a binary alloy given the composition in terms of either weight percent or atom percent.

If we represent alloy density and atomic weight by ave and Aave, respectively, then 4. In their derivations, it is assumed that total alloy volume is exactly equal to the sum of the volumes of the individual elements.

This normally is not the case for most alloys; however, it is a reasonably valid assumption and does not lead to significant errors for dilute solutions and over composition ranges where solid solutions exist. Solution To simplify this derivation, we will assume that masses are expressed in units of grams and denoted with a prime e. One type of dislocation is represented in Figure 4. This is termed an edge dislocation; it is a linear defect that centers on the line that is defined along the end of the extra half-plane of atoms.

This is sometimes termed the dislocation line, which, for the edge dislocation in Figure 4. Within the region around the dislocation line there.

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