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首页> 外文期刊>Journal of Materials Research >Mechanism of high-pressure torsion-induced shear banding and lamellar thickness saturation in Co-Cr-Fe- Ni-Nb high-entropy composites
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Mechanism of high-pressure torsion-induced shear banding and lamellar thickness saturation in Co-Cr-Fe- Ni-Nb high-entropy composites

机译：CO-CR-FE-NB高熵复合材料中高压扭转诱导剪切带和层状厚度饱和的机理

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摘要

High- entropy composites ( HECs) were subjected to severe straining by high- pressure torsion ( HPT) to evaluate their influence on the evolution of microstructure and deformation behavior. Severe straining leads to a homogeneously strained microstructure and inhomogeneous micro- shear bands in these HECs. Nb addition in HECs varies the microstructure from single phase to eutectic, and the Vickers microhardness in HPT HECs increases to 7.45 GPa. Nb addition up to x = 0.80 in as- cast HECs improves the strength of these materials at the expense of its plasticity. Nevertheless, severe straining provides a better combination of strength and ductility without sacrificing its plasticity. Such improvement in properties is attributed to the evolved microstructural features, formation of " transformation- shear bands ( T- SBs)" and " deformation- shear bands ( D- SBs)" at severe straining. This assures the homogeneous deformation by shear banding and suggests that shear banding is the dominant deformation mechanism when the lamellar spacing becomes saturated upon severe straining.
机译：通过高压扭转（HT）对高熵复合材料（HEC）进行严重应变，以评估它们对微观结构和变形行为的演变的影响。严重的应变导致这些HEC中的均匀应变的微观结构和不均匀的微剪切带。 HEC中的Nb加入从单相到共晶的微观结构变化，HPT HEC中的维氏微硬度增加到7.45GPa。在铸造的HEC中添加高达x = 0.80，以牺牲可塑性的牺牲提高了这些材料的强度。然而，严重的紧张提供了更好的强度和延展性组合，而不会牺牲其可塑性。性质的这种改进归因于进化的微观结构特征，在严重紧张时形成“转化 - 剪切带（T-SBS）”和“变形 - 剪切条带（D-SBS）”。这确保了剪切带的均匀变形，并表明当在严重紧张时使层状间距变得饱和时，剪切绑带是主导变形机构。

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