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Structural evolutions of metallic materials processed by severe plastic deformation

机译：严重塑性变形加工的金属材料的结构演变

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Bulk nanostructured (ns)/ultrafine-grained (UFG) metallic materials possess very high strength, making them attractive for high strength, lightweight and energy efficient applications. The most effective approach to produce bulk ns/UFG metallic materials is severe plastic deformation (SPD). In the last 30 years, significant research efforts have been made to explore SPD processing of materials, SPD-induced microstructural evolutions, and the resulting mechanical properties. There have been a few comprehensive reviews focusing mainly on SPD processing and the mechanical properties of the resulting materials. Yet no such a review on SPD-induced micro structural evolutions is available. This paper aims to provide a comprehensive review on important micro structural evolutions and major microstructural features induced by SPD processing in single-phase metallic materials with face-centered cubic structures, body-centered cubic structures, and hexagonal close-packed structures, as well as in multi-phase alloys. The corresponding deformation mechanisms and structural evolutions during SPD processing are discussed, including dislocation slip, deformation twinning, phase transformation, grain refinement, grain growth, and the evolution of dislocation density. A brief review on the mechanical properties of SPD-processed materials is also provided to correlate the structure with mechanical properties of SPD-processed materials, which is important for guiding structural design for optimum mechanical properties of materials.
机译：块状纳米结构（ns）/超细晶粒（UFG）金属材料具有非常高的强度，使其对于高强度，轻便和节能的应用具有吸引力。生产大块ns / UFG金属材料的最有效方法是严重的塑性变形（SPD）。在过去的30年中，人们进行了大量的研究工作来探索材料的SPD加工，SPD诱导的微观结构演变以及由此产生的机械性能。有一些全面的评论主要集中在SPD加工和所得材料的机械性能上。尚无有关SPD诱导的微观结构演变的评论。本文旨在对表面相立方结构，体心立方结构和六方密堆积结构的单相金属材料中SPD加工引起的重要微观结构演变和主要微观结构特征进行全面综述。在多相合金中。讨论了SPD加工过程中相应的形变机理和结构演化，包括位错滑移，形变孪生，相变，晶粒细化，晶粒长大和位错密度的演化。还简要介绍了SPD加工材料的机械性能，以将结构与SPD加工材料的机械性能相关联，这对于指导结构设计以实现材料的最佳机械性能非常重要。

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