Dynamic damage response of sing-crystal NiTi alloys induced by shear localization

IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Acta Mechanica Sinica Pub Date : 2024-09-12 DOI:10.1007/s10409-024-24177-x
Yuchen Zhang  (, ), Weilong Yang  (, ), Xin Yang  (, ), Jin Wang  (, ), Chao Lv  (, ), Hao Zhang  (, ), Xiaoyang Pei  (, ), Fang Wang  (, )
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Abstract

This work investigates the dynamic response of a monocrystalline nickel-titanium (NiTi) alloy at the atomic scale. The results deduced from non-equilibrium molecular dynamics modeling demonstrate that no shear deformation band (SDB) appears in the sample at an impact velocity of less than 0.75 km/s. As this velocity increases, shear deformations become pronouncedly localized, and the average spacing between SDBs decreases until it stabilizes. Combining shear stress and particle velocity profiles, the survival of SDBs is found to be closely associated with plastic deformation. The dislocations clustering around SDBs predominantly exhibit 〈100〉 partial dislocations, whereas 1/2〈111〉 full dislocations are dominant in those regions without SDBs. Void nucleation always occurs on SDBs. Subsequently, void growth promotes a change in the SDB distribution characteristic. For the case without SDB, voids are randomly nucleated, and the void growth exhibits a non-uniform manner. Thus, there is an interaction between shear localization and void evolution in the NiTi alloy subjected to intensive loading. This study is expected to provide in-depth insights into the microscopic mechanism of NiTi dynamic damage.

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剪切定位诱导单晶镍钛合金的动态损伤响应
这项研究探讨了单晶镍钛(NiTi)合金在原子尺度上的动态响应。非平衡分子动力学建模推导出的结果表明,当冲击速度小于 0.75 km/s 时,样品中不会出现剪切变形带 (SDB)。随着速度的增加,剪切变形明显局部化,SDB 的平均间距减小直至稳定。结合剪切应力和颗粒速度剖面,可以发现 SDB 的存活与塑性变形密切相关。聚集在 SDB 周围的位错主要表现为〈100〉部分位错,而在没有 SDB 的区域,1/2〈111〉全位错占主导地位。空洞成核总是发生在 SDB 上。随后,空洞的生长促进了 SDB 分布特征的改变。在没有 SDB 的情况下,空洞是随机成核的,空洞的生长表现出不均匀的方式。因此,在承受高强度加载的镍钛合金中,剪切定位和空隙演化之间存在相互作用。这项研究有望深入揭示镍钛合金动态损伤的微观机理。
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来源期刊
Acta Mechanica Sinica
Acta Mechanica Sinica 物理-工程:机械
CiteScore
5.60
自引率
20.00%
发文量
1807
审稿时长
4 months
期刊介绍: Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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