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Title
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A novel Backbone-like Quasi-continuous network structure with multiscale in-situ Al3Ti, TiN, AlN: exceptional strength-ductility compatibility and heat-resistant
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Type
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Refereeing
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Keywords
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Aluminum matrix composites, Quasi-continuous network structure, Ti2AlN, Multiphase and- scale, strength-ductility compatibility, High-temperature strength
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Abstract
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The combined effects of elevated temperature and external load induce grain rotation and limit the advanced usage of Aluminum Matrix Composites as core structural applications in harsh environments. Herein, a (Al3Ti-TiN-AlN)/2024Al composite with balanced strength-ductility and heat-resistant is fabricated with Ti2AlN precursor with a novel ‘Backbone-like’ Quasi-continuous network structure composed of needle-likeand- granular micro-Al3Ti and meso-TiN, with conjunction of dense intragranular nano- AlN dispersed in the matrix. The composite achieves excellent strength-ductility compatibility (470 MPa and 6%) at room temperature, exceptional strength (172 MPa) at temperatures up to 400 °C, along with a low CTE of 19×10-6/℃. The superior strength-ductility compatibility benefits from the strong pinning effect on dislocation motion and grain boundary sliding by nanoparticles at the microscopic level, and the strong drag effect of the network skeleton on the matrix flow at the macroscopic level. This work promises the selection of 2024Al composites for potential applications at service temperatures up to 400 ℃.
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Researchers
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Mehdi Montazeripour (Referee)
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