Abstract
Cu-Be alloys exhibit an excellent hardening through aging after solution treatment. The aged Cu-Be alloys have the highest hardness, tensile strength, and proof stress among the copper alloys and possess an excellent electric and heat conductivity. Thus Cu-Be alloys are widely used as electric parts due to the high elastic limit and electric conductivity. During an investigation of aging behavior of Cu-Be alloys, a newly revealed phenomenon similar to the shape memory effect in a sense has been found. The shape memory effect is characterized by a reversible shape change accompanied by a large deformation due to the martensitic transformation. The newly revealed phenomenon of Cu-Be alloy is similar to the shape memory effect in respect to the reversible shape change with a large deformation. However, the phenomenon is caused by a small amount of initial strain and subsequent aging under the externally stressed condition. Therefore, the mechanism is not the same as those of the shape memory effect. The chapter reports the phenomenon revealed in a Cu-Be alloy.
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