Microstructural investigation of the deformed volume beneath quasi-static and dynamic indentation in Ni single crystal

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2025-03-31 DOI:10.1016/j.matlet.2025.138506

Kehua Wang , Jian Chen , Yanhuai Li , Zezhou Li , Xiao Tao , Wubian Tian

引用次数: 0

Abstract

The deformed volume beneath the Ni (100) single crystal after quasi-static (<10¹ s⁻¹) and dynamic indentation (>10³ s⁻¹) tests were comparatively investigated. The lattice rotation and microstructure were explored using on-axis TKD and TEM methods. The results show that quasi-static indentation induces symmetrical lattice rotation and uniformly distributed sub-grains, while dynamic indentation shows asymmetrical crystal rotation and severe plasticity localization close to the edge of indenter. The observed difference is well interpreted by the dislocation rearrangement and dislocation emission mechanism in quasi-static and dynamic indentation respectively. The heterogeneity of plasticity in dynamic indentation can be attributed to the higher contact stress and pre-existing surface defect on the edge of indenter leading to the concentrated dislocation emission.

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Ni单晶准静态和动态压痕下变形体积的显微组织研究

对比研究了Ni（100）单晶在准静态（> 101 s−1）和动态压痕（>103 s−1）下的变形体积。采用轴向TKD和TEM方法对其晶格旋转和微观结构进行了研究。结果表明：准静态压痕引起对称的晶格旋转和均匀分布的亚晶粒，而动态压痕引起不对称的晶体旋转和靠近压痕边缘的严重塑性局部化。准静态压痕中的位错重排和动态压痕中的位错发射机制可以很好地解释这种差异。动态压痕中塑性的非均匀性可归因于较高的接触应力和压痕边缘预先存在的表面缺陷导致位错发射集中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive