Opposite grain size dependence of strain rate sensitivity of copper at low vs high strain rates

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 738; pp. 430 - 438
• Main Authors: Mao, Z.N., An, X.H., Liao, X.Z., Wang, J.T.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 19.12.2018; Elsevier BV
• Subjects: Activation; Copper; Deformation mechanisms; Dependence; Dynamic tension; FCC metals; Grain size; Misalignment; Opposite grain size dependence; Sensitivity analysis; Strain rate; Strain rate sensitivity; Tensile deformation; Thermal activation; Viscous drag; Viscous drag; Strain rate sensitivity; Opposite grain size dependence; Dynamic tension; Thermal activation

The grain size dependence of the strain rate sensitivity (SRS) of copper were systematically investigated via tensile deformation at strain rates of ~10−4 s−1 and ~103 s−1. In contrast to the general perception that SRS increases with decreasing grain size at low strain rates in FCC metals, the SRS...