Macroscopic shear localization and fracture of notched and unnotched Al–Zn–Mg–Cu bars
Macroscopic shear localization and fracture of notched and unnotched Al–Zn–Mg–Cu bars
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有缺口和无缺口 Al-Zn-Mg-Cu 棒材的宏观剪切局部化和断裂
DOI：
10.1179/mst.1987.3.2.125
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发表时间：
1987
影响因子：
1.8
通讯作者：
H. Li
中科院分区：
文献类型：
--
作者：
C. Chen;H. Li
对Al-6Zn-2·3Mg-1·7Cu合金棒材进行了缺口和未缺口拉伸试验。未龄期和峰值龄期无缺口试件在试验过程中表现为宏观剪切局部化，随后发生剪切破坏，而过龄期无缺口试件则表现为传统的“杯锥”破坏模式。缺口的引入改变了试样的变形模式和断裂模式。变形被限制在缺口区域内，缺口处形成的三轴拉应力导致晶界分裂，使变形模式和破坏模式复杂化。这些试样的断裂行为可以用晶体滑移理论来解释。MST / 197
Tensile tests of notched and unnotched Al–6Zn–2·3Mg–1·7Cu alloy bars have been carried out. The underaged and peak-aged unnotched specimens exhibit macroscopic shear localization during testing, followed by shear failure, whereas the overaged unnotched specimens exhibit the conventional ‘cup–cone’ mode of failure. The introduction of a notch changes the deformation pattern and the fracture mode of the specimens. Deformation is constrained within the notched region, and the triaxial tensile stress developed at the notch results in grain boundary splitting, which complicates the deformation pattern and failure mode. The fracture behaviour of these specimens is explained by an adaptation of crystal slip theory. MST/197