Strain rate- and temperature-dependent mechanical properties of Ti-6Al-4V in dynamic compression: hardening and softening behaviour analysis using strain energy-based method

IF 1.9 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Bulletin of Materials Science Pub Date : 2024-08-06 DOI:10.1007/s12034-024-03251-y
D Yang, Z W Jiang
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Abstract

Studies have shown that the deformation of Ti alloys is due to the competition between hardening and softening effects under dynamic loading. However, there are limited indicators of this behaviour throughout the complete stress–strain process. This study aims to quantify the impact of strain rate and temperature on the hardening/softening behaviour of Ti-6Al-4V using a split-Hopkinson pressure bar system over a range of 2000 to 7000 s−1 strain rates and temperatures from 25 to 800°C. Firstly, this study proposes an evaluation index of material hardening/softening behaviour based on the complete stress–strain curve and energy evolution characteristic. Further, the dynamic mechanical properties of Ti-6Al-4V are investigated through the analysis of the stress–strain relationship and fracture morphology. Finally, the hardening/softening index is calculated and analysed. The findings revealed that the fracture surface of the impact specimen displayed dimple-like and smooth features, that are significantly influenced by both temperature and strain rate. The stress–strain curves demonstrated that Ti-6Al-4V exhibits remarkable strain-rate strengthening, plastic increasing, and strain work hardening behaviour. The hardening/softening index Br decreases with an increase in strain rate. For specific strain rates of 3000, 5000 and 7000 s−1, Br increases as the loading temperature rises from 25 to 400°C, but decreases when the loading temperature is increased to 600°C. At a strain rate of 2000 s−1, Br increases monotonically until the loading temperature reaches \(\sim\)800°C. These observations are found to be related to the microstructural evolution at varying temperatures and strain rates.

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动态压缩中与应变率和温度有关的 Ti-6Al-4V 力学性能:使用基于应变能的方法分析硬化和软化行为
摘要 研究表明,钛合金的变形是由于动态加载下硬化和软化效应之间的竞争造成的。然而,在整个应力-应变过程中,有关这种行为的指标非常有限。本研究旨在使用分体式霍普金森压力棒系统,在 2000 到 7000 s-1 的应变速率和 25 到 800°C 的温度范围内,量化应变速率和温度对 Ti-6Al-4V 硬化/软化行为的影响。首先,本研究基于完整的应力-应变曲线和能量演变特征,提出了材料硬化/软化行为的评价指标。然后,通过分析应力-应变关系和断口形态,研究了 Ti-6Al-4V 的动态力学性能。最后,计算并分析了硬化/软化指数。研究结果表明,冲击试样的断裂表面呈现出窝状和光滑的特征,这些特征受到温度和应变速率的显著影响。应力-应变曲线表明,Ti-6Al-4V 具有显著的应变速率强化、塑性增强和应变加工硬化行为。硬化/软化指数 Br 随应变速率的增加而降低。对于 3000、5000 和 7000 s-1 的特定应变速率,当加载温度从 25°C 升至 400°C 时,Br 会增加,但当加载温度升至 600°C 时,Br 会减小。在应变速率为 2000 s-1 时,Br 单调地增加,直到加载温度达到 800°C。这些观察结果与不同温度和应变率下的微结构演变有关。
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来源期刊
Bulletin of Materials Science
Bulletin of Materials Science 工程技术-材料科学:综合
CiteScore
3.40
自引率
5.60%
发文量
209
审稿时长
11.5 months
期刊介绍: The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.
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