Brass Bravais lattice

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Alloy phases will be described sfructurally using the following multiple (and somewhat redundant) nomenclature Name(s) Prototype (Pearson Symbol, Stmcture Report Symbol). As an example CuZn ( 8-Cu-Zn, /3-brass) CsCl (cP2, B2) type. (Note The Pearson symbol already contains the crystal system and Bravais lattice). Alloy phase compilations with stmctural data are available. 

Before considering the ordering transformation in AuCu, which is rather complex, we might examine the behavior of j5-brass. This alloy is stable at room temperature over a composition range of about 46 to almost 50 atomic percent zinc, and so may be represented fairly closely by the formula CuZn. At high temperatures its structure is, statistically, body-centered cubic, with the copper and zinc atoms distributed at random. Below a critical temperature of about 460°C, ordering occurs the cell corners are then occupied only by copper atoms and the cell centers only by zinc atoms, as indicated in Fig. 13-6. The ordered alloy therefore has the CsCl structure and its Bravais lattice is simple cubic. Other alloys which have the same ordered structure are CuBe, CuPd, and FeCo. 

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