晶粒尺寸与晶体取向对CrCoNi中熵合金孪晶界疲劳开裂行为的影响
收稿日期: 2024-06-24
修回日期: 2024-08-09
网络出版日期: 2024-11-12
基金资助
国家自然科学基金项目(52371101);辽宁省兴辽英才计划项目(XLYC2203105)
Effects of Grain Size and Crystallographic Orientation on Fatigue Cracking at Twin Boundaries in CrCoNi Medium-Entropy Alloy
Received date: 2024-06-24
Revised date: 2024-08-09
Online published: 2024-11-12
Supported by
National Natural Science Foundation of China(52371101);Liaoning Revitalization Talents Pro-gram(XLYC2203105)
CrCoNi中熵合金拥有超越大多数fcc多主元合金和传统合金的优异综合力学性能，具有巨大的发展潜力以及广泛的应用前景。为确保该合金的长期稳定且安全使用，有必要充分探索其疲劳特性和损伤机理。细晶强化是该合金的主要强化方式，明确不同晶粒尺寸下孪晶界疲劳的开裂规律对减少沿晶疲劳开裂、提高材料疲劳性能具有重要意义。本工作采用滑移形貌法研究了两种晶粒尺寸CrCoNi中熵合金在低周疲劳条件下的孪晶界疲劳开裂行为。结果表明，对于任意给定的晶粒尺寸，CrCoNi中熵合金从滑移带开裂到孪晶界开裂之间的转变随着基体与孪晶之间Schmid因子差的增加而变化；随着孪晶界两侧滑移带Schmid因子差的增加，孪晶界面开裂变得更加容易。孪晶界开裂所需的Schmid因子差随晶粒尺寸增加而减小；随着晶粒尺寸增加，较小Schmid因子差使孪晶界附近产生较大的位错塞积，导致孪晶界损伤加剧而易疲劳开裂。
关键词： CrCoNi中熵合金; 疲劳开裂; 孪晶界; 晶粒尺寸; 滑移带
王玉洁 , 李琳琳 , 张振军 , 张哲峰 . 晶粒尺寸与晶体取向对CrCoNi中熵合金孪晶界疲劳开裂行为的影响[J]. 金属学报, 2026 , 62(7) : 1246 -1256 . DOI: 10.11900/0412.1961.2024.00211
The CrCoNi medium-entropy alloy is known to demonstrate superior comprehensive mechanical properties relative to most fcc multiple-principal-elemental alloys. To ensure the long-term stability and safety of this alloy in practical applications, its fatigue characteristics and damage mechanisms must be thoroughly explored. Grain refinement is a crucial method for strengthening this alloy, and the effect of grain size on twin-boundary (TB) fatigue cracking must be clarified to reduce the intergranular fatigue cracks and improve fatigue performance. By conducting SEM measurements, the fatigue cracking behaviors at TBs in a CrCoNi medium-entropy alloy with two different grain sizes were systematically studied employing the slipping morphology method under low-cycle fatigue tests. The surface roughness around the TBs of the fatigued samples was characterized via laser confocal microscopy and white-light interference microscopy to quantify variations in the surface damage levels. Irrespective of grain size, the transition from slip-band cracking to TB cracking was observed to vary with the increasing difference in the Schmid factors (DSF) between the matrix and twin. Further, the propensity for TB cracking was facilitated by the escalation of DSF. Moreover, the magnitude of the required DSF for TB cracking was influenced by the grain size. The requirement of DSF for TB cracking decreased with increasing grain size. With the increase in grain size, even the minimal DSF is expected to result in the significant pilling up of dislocations near the TBs, thereby worsening the damage and rendering these boundaries favorable sites for fatigue cracking.
Key words： CrCoNi medium-entropy alloy; fatigue cracking; twin boundary; grain size; slip band
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