Abstract
Abstract The present paper is a review of the plasticity of intermetallic alloys which have potential for structural applications, particularly at elevated temperatures. First, the mechanisms of plasticity and the methods to overcome brittleness in intermetallics with ordered non-cubic structures such as TiAl and Ti3Al are discussed. Second, intermetallics with ordered cubic structures, both b.c.c. (NiAl, FeAl) and f.c.c., are discussed. The latter group includes Ni3Al and intermetallics obtained by transformation of the low-symmetry ordered hexagonal and tetragonal crystal structures into the L12-type structure. This group consists of (Fe, Co, Ni)3V (long-range-ordered (LRO) alloys) and Al3Ti and Al3Zr based modified with copper, iron, nickel, zinc, manganese and chromium. In spite of the fact that both types are obtained by a very similar lattice transformation they exhibit a totally opposite plastic behaviour, being either highly ductile (LRO alloys) or very brittle (Al3Ti- and Al3Zr-base alloys).
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