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Strong ductile and hierarchical hetero-lamellar-structured alloys through microstructural inheritance and refinement

机译:通过微观结构继承和细化生产出坚固、延展性和多级异质层状结构合金

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摘要

Brittle intermetallic phases that exist ubiquitously in diverse technologically important structural materials, especially in multiple principal element alloys, hamper practical applications due to premature failure. Here, we report a hierarchical hetero-lamellar structure (HLS) fabricated using a microstructural inheritance and refinement strategy that involves simple rolling followed by rapid annealing in a brittle B2-intermetallic-containing Al0.7CoCrFeNi MPEA. By harnessing high hetero-deformation-induced internal stresses, the designed HLS sequentially stimulates multiple previously inaccessible deformation and reinforcement mechanisms, which not only ductilize the brittle B2 phase, preempting premature failure, but also substantially strain-harden the adjoining soft phase to sustain stable tensile flow, leading to superior strength−ductility enhancement. This fast and low-cost microstructural design strategy is expected to impact a broad range of structural materials.
机译:脆性金属间化合物相普遍存在于各种技术上重要的结构材料中,尤其是在多种主元素合金中,由于过早失效而阻碍了实际应用。在这里,我们报道了一种使用微结构继承和细化策略制造的分层异质层状结构 (HLS),该策略涉及简单的轧制,然后在含有金属间化合物的脆性 Al0.7CoCrFeNi MPEA 中快速退火。通过利用高异质变形引起的内应力,设计的 HLS 依次刺激多个以前无法接近的变形和加固机制,这不仅使脆性 B2 相延展化,防止过早失效,而且还大大应变硬化相邻的软相以维持稳定的拉伸流动,从而获得卓越的强度延展性增强。这种快速且低成本的微结构设计策略预计将影响广泛的结构材料。

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