Mesoscale Hetero-Deformation Induced (HDI) Stress in FeAl-Based Metallic-Intermetallic Laminate (MIL) Composites
作者： Kenneth S. Vecchio , Haoren Wang , Rui Kou , Haozhe Yi , Samuel Figueroa
DOI: 10.1016/J.ACTAMAT.2021.116949
关键词:
摘要: Abstract Single-phase intermetallic FeAl layered material is synthesized using a foil approach to study the fracture mechanisms of FeAl-based metallic-intermetallic laminate (MIL) composites containing similarly fabricated structure. The mechanical properties and crack evolution single-phase are investigated via incremental compression testing. Microstructure composition assessment confirm similar layer microstructure MIL composites. When compressed perpendicular layers, both materials fail by axial splitting phase along loading direction. Mesoscale hetero-deformation induced (HDI) stress, which tensile on layers composites, accelerates nucleation propagation, eventually inducing failure. HDI stress evaluated finite element analysis (FEA) simulation provides an explanation for difference between 430SS-FeAl 304SS-FeAl posses composition, but very different strengths. parallel mesoscale expected be negligible, whereas geometrically necessary dislocation (GND) pile-up can enhance performance Fracture toughness characterized four-point bend testing, results demonstrate improvement over material.
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