Damage investigation in A319 aluminum alloy by digital image correlation during in-situ tensile tests
Damage investigation in A319 aluminum alloy by digital image correlation during in-situ tensile tests
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DOI：
10.1016/j.prostr.2016.06.426
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Zaidao Li;N. Limodin;A. Tandjaoui;P. Quaegebeur;J. Witz;D. Balloy
中科院分区：
文献类型：
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作者：
Zaidao Li;N. Limodin;A. Tandjaoui;P. Quaegebeur;J. Witz;D. Balloy
这项工作的目的是分析压铸 A319 铝合金在拉伸加载过程中的应变场不均匀性。所研究合金的微观结构表征在 2D 和 3D 中进行，微观结构由硬质夹杂物（即共晶 Si 和 Al2Cu 相）和微孔组成。为了研究不同硬质颗粒对裂纹扩展的作用，建立了实验方案，并在拉伸试验过程中使用原位显微装置实时进行表面损伤观察，从而可以跟踪变形和裂纹的发展和定位。结果通过 DIC 测量和断口分析表明了共晶 Si 和 Al2Cu 相在裂纹扩展中的作用。裂纹通常通过 Al2Cu 的断裂以及碎片化的 Si 颗粒传播，而不是通过它们从基体的脱聚传播。
The aim of this work is to analyse the strain fields heterogeneity in a Die Casting A319 aluminium alloy during tensile loading. The microstructure characterization of the studied alloy was performed in 2D and 3D, the microstructure consists of hard inclusions (i.e. eutectic Si and Al2Cu phases) and micropores. In order to study the role of the different hard particles on the propagation of cracks, an experimental protocol was set up and surface damage observations are performed in real-time with an in situ microscopic device during tensile test which allows following the development and localization of the deformation and cracks. The results showed the role of eutectic Si and Al2Cu phases in the crack propagation by DIC measurement and fractography. Cracks often propagate through the fracture of Al2Cu, as well as through fragmented Si particles rather than by their decohesion from the matrix.