New insights into physical origins of dynamic strain aging in Ti-2Al-2.5Zr alloy and influence on LCF and HCF behaviors

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-10-28 DOI:10.1016/j.msea.2024.147483

Jingtai Yu , Bingbing Li , Mengqi Li , Shengkun Wang , Xiang Guo , Jun Wu , Gang Chen

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Abstract

The multi-step strain aging tests were meticulously designed in this work to reveal the physical mechanisms of static strain aging (SSA) and dynamic strain aging (DSA) behaviors in Ti-2Al-2.5Zr alloy for the first time. It was revealed that the shuffling mechanism of interstitial oxygen atoms combined with the pinning effect of locally-generated cross-slip on the movement of screw dislocations were responsible for the occurrence of strain aging. Furthermore, the effects of DSA on the low-cycle fatigue (LCF) and high-cycle fatigue (HCF) properties were elucidated in Ti-2Al-2.5Zr alloy. Results showed that the sensitivity of DSA to cyclic loading was attributed to the generation of numerous residual edge dislocation segments through local cross-slip, facilitating the formation of dislocation veins which inhibited the formation of persistent slip bands (PSBs) and led to the significantly cyclic hardening. Finally, it was emphasized that the phenomenon of DSA should be carefully considered for the structural integrity assessment of Ti-2Al-2.5Zr alloy and several suggestions were provided.

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关于 Ti-2Al-2.5Zr 合金动态应变时效的物理起源及其对 LCF 和 HCF 行为影响的新见解

该研究精心设计了多步应变时效试验，首次揭示了Ti-2Al-2.5Zr合金静态应变时效（SSA）和动态应变时效（DSA）行为的物理机制。研究发现，间隙氧原子的洗牌机制与局部产生的交叉滑移对螺位错运动的钉扎效应是导致应变时效发生的原因。此外，还阐明了 DSA 对 Ti-2Al-2.5Zr 合金的低循环疲劳 (LCF) 和高循环疲劳 (HCF) 性能的影响。结果表明，DSA 对循环加载的敏感性归因于通过局部交叉滑移产生了大量残余边缘位错段，促进了位错脉的形成，从而抑制了持久滑移带（PSB）的形成，并导致了显著的循环硬化。最后，研究人员强调在评估 Ti-2Al-2.5Zr 合金的结构完整性时应仔细考虑 DSA 现象，并提出了若干建议。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.