Abstract
Mechanical properties and fracture behavior of Cu-0. 84Co-0. 23Be alloy after plastic deformation and heat treatment were comparatively investigated. Severe plastic deformation by hot extrusion and cold drawing was adopted to induce large plastic strain of Cu-0. 84Co-0. 23Be alloy. The tensile strength and elongation are up to 476. 6 MPa and 18%, respectively. The fractured surface consists of deep dimples and micro-voids. Due to the formation of supersaturated solid solution on the Cu matrix by solution treatment at 950 °C for 1 h, the tensile strength decreased to 271. 9 MPa, while the elongation increased to 42%. The fracture morphology is parabolic dimple. Furthermore, the tensile strength increased significantly to 580. 2 MPa after aging at 480 °C for 4 h. During the aging process, a large number of precipitates formed and distributed on the Cu matrix. The fracture feature of aged specimens with low elongation (4. 6%) exhibits an obvious brittle intergranular fracture. It is confirmed that the mechanical properties and fracture behavior are dominated by the microstructure characteristics of Cu-0. 84Co-0. 23Be alloy after plastic deformation and heat treatment. In addition, the fracture behavior at 450 °C of aged Cu-0. 84Co-0. 23Be alloy was also studied. The tensile strength and elongation are 383. 6 MPa and 11. 2%, respectively. The fractured morphologies are mainly candy-shaped with partial parabolic dimples and equiaxed dimples. The fracture mode is multi-mixed mechanism that brittle intergranular fracture plays a dominant role and ductile fracture is secondary.
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Foundation Item: Item Sponsored by National Key Research and Development Program of China (2016YFB0301401); State Key Program of National Natural Science Foundation of China (U1502274); Innovation Scientists and Technicians Troop Construction Projects of Henan Province of China (C20150014); Program for Innovation Research Team (in Science and Technology) in University of Henan Province of China (14IRTSTHN007)
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Zhou, Yj., Song, Kx., Xing, Jd. et al. Mechanical Properties and Fracture Behavior of Cu-Co-Be Alloy after Plastic Deformation and Heat Treatment. J. Iron Steel Res. Int. 23, 933–939 (2016). https://doi.org/10.1016/S1006-706X(16)30141-8
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DOI: https://doi.org/10.1016/S1006-706X(16)30141-8