{"title":"In-situ TEM investigation of the effect of nano twins on the evolution of He bubbles under thermo-mechanical coupling conditions","authors":"Chengpeng Liu, Xiang-Xi Ye, Hefei Huang","doi":"10.1016/j.scriptamat.2024.116431","DOIUrl":null,"url":null,"abstract":"<div><div>In this study, the <em>in-situ</em> TEM tensile experiment was performed on the Nb-modified GH3535 alloy after He ion irradiation at 750 °C, to investigate the influence of the nano twins on the evolution of irradiation-induced He bubbles under thermo-mechanical coupling conditions. The results suggest that the interaction between the He bubbles and nano twins may contribute to the abnormal irradiation hardening observed in Nb-GH3535 alloy, in addition to the effects of the He bubbles and precipitate strengthening. Moreover, the merger and coarsening of the He bubbles under the influence of the nano twins provide direct experimental evidence supporting the previously proposed stress-assisted coarsening mechanism for the He bubbles.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116431"},"PeriodicalIF":5.3000,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scripta Materialia","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1359646224004664","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, the in-situ TEM tensile experiment was performed on the Nb-modified GH3535 alloy after He ion irradiation at 750 °C, to investigate the influence of the nano twins on the evolution of irradiation-induced He bubbles under thermo-mechanical coupling conditions. The results suggest that the interaction between the He bubbles and nano twins may contribute to the abnormal irradiation hardening observed in Nb-GH3535 alloy, in addition to the effects of the He bubbles and precipitate strengthening. Moreover, the merger and coarsening of the He bubbles under the influence of the nano twins provide direct experimental evidence supporting the previously proposed stress-assisted coarsening mechanism for the He bubbles.
本研究对 750 ℃ He 离子辐照后的 Nb 改性 GH3535 合金进行了原位 TEM 拉伸实验，以研究纳米孪晶在热机械耦合条件下对辐照诱导 He 气泡演化的影响。结果表明，除了氦气泡和沉淀强化的影响之外，氦气泡和纳米孪晶之间的相互作用也可能导致在 Nb-GH3535 合金中观察到的异常辐照硬化。此外，氦泡在纳米孪晶影响下的合并和粗化为之前提出的氦泡应力辅助粗化机制提供了直接的实验证据。
期刊介绍：
Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.
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