异质纳米结构金属强化韧化机理研究进展

卢磊, 赵怀智

Progress in Strengthening and Toughening Mechanisms of Heterogeneous Nanostructured Metals

LU Lei, ZHAO Huaizhi

图1 层状结构Cu/Cu4Zn和Cu/Cu32Zn的局部微观结构(层间距λ = 19 μm)与相应的工程应力-应变曲线,以及3种层状纳米孪晶Cu样品的微观结构示意图与相应的工程应力-应变曲线和加工硬化率曲线,并与相应的单组分进行对照[33,34]

Fig.1 Microstructures and engineering stress-strain curves of laminated Cu/Cu4Zn and Cu/Cu32Zn, or nanotwinned Cu samples (GNT—gradient nanotwinned, HNT—homogeneous nanotwinned) (a, b) microstructures of laminated Cu/Cu4Zn (a) and Cu/Cu32Zn (b) with layer thickness (λ) of 19 μm[33] (c, d) tensile engineering stress-strain curves of freestanding Cu, Cu4Zn, and Cu32Zn samples (c), and laminated Cu/Cu4Zn, Cu/Cu32Zn with different layer thicknesses (d) (Inset in Fig.1c shows work-hardening rate vs true strain of freestanding Cu, Cu4Zn, and Cu32Zn)[33] (e-g) schematics of microstructures of three sandwiched nanotwinned Cu samples (GNT-??, GNT-??, and GNT-??) (e), and their engineering stress-strain curves (f) and work hardening rate (Θ) vs true strain curves (g) in comparison to their HNT components[34]