Deformation Behavior News Today

High temperature tensile behaviors of two W-free Co-Ni-Al-based γ'-strengthened superalloys at 773 K ~ 1073 K were investigated. The tensile strength and elongation of two superalloys decrease with increasing temperature. The fracture mechanism changes from dimple fracture to brittle fracture. A detailed observation of the fracture shows that the intermediate temperature embrittlement caused by decohesion of slip plane plays a significant role in reducing high temperature performance. Both...

Pure copper specimens 0.1, 0.2, and 0.3 mm thick were annealed at different temperatures. The influence of the size effect on the mechanical properties and fracture behavior of annealed pure copper was investigated in a uniaxial tensile test. The elongation and tensile strength decreased with the grain size at a constant specimen thickness. If the grain size remains constant and its thickness varies, the tensile strength and elongation increase with the specimen thickness. The specimen grain siz...