Effect of Annealing on the Mechanical Tensile Behavior of Copper–Aluminum Composites Prepared by Rotary Forging

Abstract—The effect of 2-h annealing at temperatures of 180–300°C on the mechanical tensile behavior of a copper/aluminum D16 alloy composite prepared by cold rotary forging of an blank 20 mm in diameter to an blank 5 and 2.5 mm in diameter (e = 2.77 and 4.16, respectively) is studied. For comparison, a composite, which comprises additional 12Kh18N10T steel fibers longitudinally arranged between a sheath and a rod, is considered. Acoustic emission testing is used to study the deformation and failure processes of composite samples during uniaxial tension. The mechanical properties and deformation of the copper–aluminum composites are found to depend on the assembling and degree of reduction of area during rotary forging. The mechanical properties of the copper/aluminum alloy composite are less sensitive to heating as compared to those of the copper/steel/aluminum alloy composite. Annealing at 300°C causes the most substantial softening of the composite samples.