Quasi-static uniaxial tension and compression, three-point bending, and Hopkinson bar measurements have been carried out on low-porosity Al/Ni compacts (pressed powders) as well as compacts of the constituent Al and Ni. Concurrently, mesoscale material point method (MPM) simulations of fully resolved Al, Ni, and Al/Ni compact microstructures and engineering scale MPM simulations of homogenized Al/Ni compacts have been conducted. These simulations, in conjunction with the experimental measurements, have allowed us to parameterize mesoscale particle/particle contact models and engineering scale anisotropic damage mechanics models for the materials. The goal of this coordinated experimental and simulation study of Al/Ni and its constituent materials was to better understand their mechanical properties and gain insight into the nature of Al–Ni and Al–Al interfaces in Al/Ni compacts and their impact on mechanical properties of the compacts. We found that brittle tensile failure of Al/Ni compacts was dominated by the strength of the Al–Al interface while ductile compressive behavior of Al/Ni compacts was largely determined by the behavior of the Al phase. The properties of both Al–Al interface and Al phase appear to be altered by the presence of Ni. Finally, it was found that softening resulting from shear damage offset underlying strain hardening of the Al and Ni phases during compressive loading of the Al/Ni compacts.

中文翻译：

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深入了解界面对低孔隙率 Al/Ni 压块机械性能的作用：实验与模拟的比较

准静态单轴拉伸和压缩、三点弯曲和霍普金森杆测量已对低孔隙率的 Al/Ni 压坯（压制粉末）以及成分 Al 和 Ni 的压坯进行。同时，已经进行了完全解析的 Al、Ni 和 Al/Ni 致密微观结构的中尺度材料点法 (MPM) 模拟以及均质化 Al/Ni 压块的工程规模 MPM 模拟。这些模拟与实验测量相结合，使我们能够对材料的中尺度粒子/粒子接触模型和工程尺度各向异性损伤力学模型进行参数化。这种对 Al/Ni 及其组成材料进行协调实验和模拟研究的目的是更好地了解它们的机械性能，并深入了解 Al/Ni 压块中 Al-Ni 和 Al-Al 界面的性质及其对机械性能的影响的契约。我们发现 Al/Ni 压块的脆性拉伸破坏由 Al-Al 界面的强度决定，而 Al/Ni 压块的延展压缩行为很大程度上取决于 Al 相的行为。Al-Al 界面和 Al 相的性质似乎因 Ni 的存在而改变。最后，发现由剪切损伤引起的软化抵消了 Al/Ni 压坯压缩加载过程中 Al 和 Ni 相的潜在应变硬化。