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首页> 外文期刊>Materials Science and Engineering >Dislocation structures representing individual slip systems within the a phase of a Ti-6A1-4V alloy deformed in tension
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Dislocation structures representing individual slip systems within the a phase of a Ti-6A1-4V alloy deformed in tension

机译：代表在Ti-6a1-4V合金的相位内的单个滑动系统的位错结构变形在张力中

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摘要

The current work performed a detailed examination of the dislocation structures associated with individual slip systems within the a phase of a Ti-6A1-4V alloy subjected to tensile deformation as a function of crystallite orientation. Tensile samples were deformed as part of an in-situ synchrotron experiment at a strain rate of 3 × 10~(-4) s~(-1) to a strain of about 0.07. The dislocation type, arrangement and density within eighteen randomly selected grains were examined post-mortem using transmission electron microscopy, complemented by the automatic determination of individual crystallite orientations through precession nanodiffraction. The Schmid factor values for all possible hcp slip systems were then calculated for each of the grain orientations and these were allocated to one of the four slip domains, representing prismatic, basal, first-type pyramidal and first-type pyramidal slip, on the basis of both the Schmid factor value and dislocation structure character. The deformation took place entirely through dislocation glide and the slip system selection and dislocation densities were governed by the global Schmid factor values. Prismatic slip was a prevalent deformation mode, followed by basal slip. The -type dislocations present after deformation typically possessed a dominant screw component, with those representing prismatic slip typically being of a pure screw type, and displayed a strong tendency to adopt a screw character already during straining. Deformation also caused the formation of dislocations, located in the first-type pyramidal planes, that typically occupied entire interiors of the close-to-[0001] oriented grains and were mainly of a mixed character.
机译：目前的工作对与微晶取向的Ti-6a1-4V合金的相位的脱位结构的脱位结构进行了详细的检查，该脱位结构是作为微晶取向的函数的抗拉性变形。拉伸样品以3×10〜（-4）S〜（-1）的应变速率为原位同步rotron实验的一部分变形，以约0.07的菌株。使用透射电子显微镜检查18个随机选择的晶粒内的脱位类型，布置和密度，通过预先延迟纳米二射重定，通过自动测定单个微晶取向的自动测定。然后针对每个晶粒取向计算所有可能的HCP滑动系统的施密系数值，并且这些晶粒取向分配给四个滑动域之一，代表棱柱形，基础，第一型金字塔和第一型金字塔的滑动，基于施密因子值和位错结构特征。变形完全通过脱位滑行，滑移系统选择和错位密度受到全球席克因子值的管辖。棱柱滑动是一种普遍的变形模式，其次是基底滑动。在变形之后存在的型脱位通常具有主要的螺钉部件，其中表示棱柱滑动通常是纯螺杆类型的那些，并且呈现出在紧张期间采用螺钉特征的强烈倾向。变形还导致位于第一型金字塔平面中的脱位的形成，其通常占据近似的晶粒的整个内部，主要是混合特性。

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