论文部分内容阅读
从铝铜多晶体单轴拉伸变形过程的扫描电镜动态观察入手，研究其190℃×3h、190℃×10h、190℃×24h不同时效组织滑移变形特征和对剪切变形局部化的影响。发现欠时效（190℃×3h）铝铜多晶体在不同位置形成多个细观剪切带，其它时效铝铜多晶体在颈缩后迅速形成宏观剪切带。可剪切的较大沉淀相粒子将促进宏观剪切带的形成和扩展。并从对变形不均匀性、实际起动滑移系数目和反向弹性应力的影响方面进行了分析。
The dynamic observation of uniaxial tensile deformation of aluminum-copper polycrystal during scanning electron microscope (SEM) was used to study the effects of different aging-induced slip and deformation on the deformation of shear deformation at 190 ℃ × 3h, 190 ℃ × 10h, 190 ℃ × 24h . It was found that the under-aged (190 ℃ × 3h) Al-Cu polycrystals formed multiple mesoscopic shear bands at different positions, and the other aged Al-Cu polycrystals rapidly formed macroscopic shear bands after necking. Large, precipitable phase particles will promote the formation and propagation of macroscopic shear bands. The influences of the deformation inhomogeneity, the actual slip coefficient and the reverse elastic stress are analyzed.