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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructural refinement in alloys and intermetallics by severe plastic deformation
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Microstructural refinement in alloys and intermetallics by severe plastic deformation

机译：严重塑性变形对合金和金属间化合物的显微组织细化

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摘要

Severe plastic deformation has been used over the last decades as a method for processing ductile materials to obtain fine microstructures. Typically, the microstructure obtained has a submicron size, and only rarely is the formation of nanostructures described. The present short paper examines the nature of the substructures produced during deformation in the strain range about 1-10, when dislocations accumulate to produce cell and sub-boundary structures, and considers the variation of both microstructural size and the typical misorientation across boundaries present as the strain level increases. Some examples of severe plastic deformation carried out on bulk samples of iron aluminide alloys and composites are described, where conventional processing techniques have been used to impose the high strain levels. An advantage of such conventional processes over the special techniques commonly used to impose high strain is that upscaling to large material volumes may be envisaged. The effect of such microstructural refinement on the room temperature strength and ductility of these intermetallics will be demonstrated. The high dislocation density leads to good strength, but many high angle boundaries are required to improve ductility. High-temperature creep resistance in suitable iron aluminide alloys and composites has been obtained for cases when severe plastic deformation leads to a refinement and redistibution of second phase particles.
机译：在过去的几十年中，严重的塑性变形已经用作加工延性材料以获得精细微结构的方法。通常，所获得的微结构具有亚微米尺寸，并且很少描述形成纳米结构。本篇短篇论文研究了在位错累积以产生细胞和亚边界结构时，在大约1-10的应变范围内变形过程中产生的亚结构的性质，并考虑了微结构尺寸的变化和跨边界的典型取向错误。应变水平增加。描述了对铝化铁合金和复合材料的大量样品进行的严重塑性变形的一些示例，其中使用常规加工技术施加了高应变水平。相对于通常用于施加高应变的特殊技术，这种常规方法的优点在于可以设想放大到大的材料体积。将证明这种微结构细化对这些金属间化合物的室温强度和延展性的影响。高位错密度导致良好的强度，但是需要许多大角度边界来提高延展性。在严重的塑性变形导致第二相颗粒细化和重新分布的情况下，已经获得了合适的铝化铁合金和复合材料的高温抗蠕变性。

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