arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2309.02101cond-mat.mtrl-sci
收藏

变形孪晶作为摩擦诱导应力状态的探针

Deformation twins as a probe for tribologically induced stress states

Antje Dollmann, Christian Kuebel, Vahid Tavakolli, Stefan J. Eder, Michael Feuerbacher, Tim Liening, Alexander Kauffmann, Julia Rau, Christian Greiner

AI总结:

本研究利用单晶CoCrFeMnNi的变形孪晶作为探针,实验揭示了摩擦接触中的复杂应力场及其晶粒取向依赖性,为验证摩擦应力场模型提供了理想方法。

摘要:

金属的摩擦与磨损受到构成摩擦接触的物体微观结构的严重影响。因此,理解摩擦系统整个寿命期间发生的微观结构演变,对于战略性地设计具有定制摩擦和磨损性能的摩擦系统至关重要。在此,我们聚焦于在室温下易于形成孪晶的单晶CoCrFeMnNi。变形孪晶具有显著的取向依赖性,表现出拉压不对称性、在扩展体积中的明显应变释放以及稳健的起始应力。这使得变形孪晶成为实验研究摩擦接触中复杂应力场的理想探针。我们的结果清楚地表明,在摩擦载荷下孪晶存在晶粒取向依赖性。出乎意料的是,平行于滑动方向的晶体方向或法向方向均非决定孪晶的唯一因素。该实验方法非常适合实验验证摩擦应力场模型,正如本文所展示的。

英文摘要:

Friction and wear of metals are critically influenced by the microstructures of the bodies constituting the tribological contact. Understanding the microstructural evolution taking place over the lifetime of a tribological system therefore is crucial for strategically designing tribological systems with tailored friction and wear properties. Here, we focus on single-crystalline CoCrFeMnNi that is prone to form twins at room temperature. Deformation twins feature a pronounced orientation dependence with a tension-compression anisotropy, a distinct strain release in an extended volume and robust onset stresses. This makes deformation twinning an ideal probe to experimentally investigate the complex stress fields occurring in a tribological contact. Our results clearly show a grain orientation dependence of twinning under tribological load. Unexpectedly, neither the crystal direction parallel to the sliding nor the normal direction are solely decisive for twinning. This experimental approach is ideal to experimentally validate tribological stress field models, as is demonstrates here.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑