航空级Ti-6Al-4V合金在高温驻留过程中,晶粒/界面边界发射后α相内优先形成螺位错

IF 5.5 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Pavel Cizek , Nicholas Armstrong , Sitarama R. Kada , Jun Wang , Ross A. Antoniou , Peter A. Lynch
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引用次数: 0

摘要

本文研究了Ti-6Al-4V合金在300°C的温度下,在约96%屈服应力下进行短时间停留的α相内的位错发射阵列。通过透射电镜观察了α/α晶界和α/β界面位错发射形成的阵列。正如预期的那样,上述晶粒/界面边界被证明是施加静载过程中的主要位错源。系统倾向于在发射后通过逐渐改变位错线或通过直接发射优先产生螺钉位错。在前一种情况下,在达到螺旋特性后,位错倾向于从发射面交叉滑移。螺旋位错顺序形成,直接发射,扩展的位错环呈现平行于迁移方向的长而直的螺旋型段。位错发射特性似乎受发射点周围的局部条件的支配。观察到的位错发射阵列平面及其对应的Burgers向量显示了棱柱体以及一阶和二阶锥体滑动的操作,并密切跟踪施密德因子值。有些发射面是不合理的,位错似乎可以从这些面滑到高施密德因子的滑翔面。目前的结果提供了位错结构在高温下的演化的直接证据,并将有助于更好地理解所报道的钛合金的热缓解居住疲劳。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preferential formation of screw dislocations within the α phase after the grain/interface boundary emission during elevated temperature dwell of an aero-grade Ti-6Al-4V alloy
The current work examines the dislocation emission arrays within the α phase of a Ti-6Al-4V alloy, subjected to short-duration dwell performed in tension at about 96 % of the yield stress at a temperature of 300 °C. The arrays formed through dislocation emission from the α/α grain boundaries and α/β interfaces were examined post-mortem using transmission electron microscopy. As expected, the above grain/interface boundaries proved to be the major dislocation sources during the applied dwell loading. There was a systematic tendency to preferentially generate screw dislocations either through progressive altering the dislocation lines after emission or via direct emission. In the former case, after achieving the screw character, the dislocations tended to cross slip out of the emission planes. Screw dislocations were directly emitted as sequentially formed, expanding dislocation loops exhibiting long straight screw-type segments parallel to the migration direction. The dislocation emission character appeared to be governed by the local conditions around the emission sites. The observed planes of dislocation emission arrays, together with the corresponding Burgers vectors, revealed the operation of prismatic as well as 1st and 2nd order pyramidal <a> glide, and the Schmid factor values were closely followed. Some emission planes were irrational, and dislocations seemed to be able to cross slip from these planes to the high Schmid factor glide planes. The current results provide direct evidence of the evolution of dislocation structures during dwell loading at elevated temperatures and will contribute to better understanding of the reported thermal alleviation of dwell fatigue in titanium alloys.
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来源期刊
Materials Characterization
Materials Characterization 工程技术-材料科学:表征与测试
CiteScore
7.60
自引率
8.50%
发文量
746
审稿时长
36 days
期刊介绍: Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.
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