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首页> 外文期刊>Materials Science and Engineering >Revealing the Microstructural evolution in Cu-Cr nanocrystalline alloys during high pressure torsion
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Revealing the Microstructural evolution in Cu-Cr nanocrystalline alloys during high pressure torsion

机译：揭示了铜-铬纳米晶合金在高压扭转过程中的微观结构演变

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摘要

Usually immiscible Cu-Cr compounds in equilibrium condition were mechanically processed via high pressure torsion with large and controlled strains. A systematical investigation on 57 wt%Cu - 43 wt%Cr was carried out to get insights into the microstructural evolution of Cu-Cr nanocomposites and their dissolution process, as well as to determine the solid solubility limit of Cu and Cr elements under severe deformation. Microstructural evolution was captured with grain refinement from micron-size down to less than 20 nm as the increase of strains. A strain-saturated state in 57 wt%Cu - 43 wt%Cr bulk was achieved after 100 rotations deformation (effective strain 1360), with a stable grain size of 13.7 nm and invariable hardness of 480-495 HV. Fine scanning of X-ray diffraction and sub-nanometer scale measurements of energy-dispersive X-ray spectroscopy showed that 32 wt% Cu could be fully dissolved into Cr matrix, and conversely solubility of Cr in Cu was determined to be about 3 wt% after an enough amount of deformation. The phase fraction change associated with Cu dissolution into Cr matrix during continuous deformation was captured and accurately calculated, indicating a negative exponential phase change mode. A phenomenological intermixing mechanism based on the kinetic competition between external forcing mixing and thermal-diffusion induced decomposition was proposed, which was well accordant with the phase evolution observed from experimental results.
机译：通常在平衡状态下不混溶的Cu-Cr化合物通过具有大的可控应变的高压扭转而机械加工。对57 wt％Cu-43 wt％Cr进行了系统的研究，以了解Cu-Cr纳米复合材料的微观结构演变及其溶解过程，并确定在严重变形下Cu和Cr元素的固溶极限。随着应变的增加，晶粒细化从微米尺寸减小到小于20 nm，从而捕获了微观结构演变。经过100次旋转变形（有效应变1360）后，达到了57 wt％Cu-43 wt％Cr体积的应变饱和状态，稳定的晶粒尺寸为13.7 nm，硬度恒定为480-495 HV。 X射线衍射的精细扫描和能量色散X射线光谱的亚纳米级测量表明，32％（重量）的Cu可以完全溶解在Cr基体中，反之，Cr在Cu中的溶解度约为3％（重量）。经过足够的变形后捕获并精确计算了与铜在连续变形过程中溶解到Cr基体中相关的相分数变化，这表明它是负指数相变模式。提出了一种基于外强迫混合与热扩散诱导分解之间动力学竞争的现象混合机制，与实验结果相变相吻合。

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