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Research on the Atomic-Scale Fracture Mechanism of Nickel-Based Superalloy Dd6 at High Temperature by a New In-Situ Technique in Transmission Electron Microscopy

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Bibliographic Details
Title: Research on the Atomic-Scale Fracture Mechanism of Nickel-Based Superalloy Dd6 at High Temperature by a New In-Situ Technique in Transmission Electron Microscopy
Authors: Xudong Yang, Jiabao Zhang, Wei Li, Haowei Wang, Haoyu Xu, Zhipeng Li, Jixiang Cai, Haixin Li, Jianfei Zhang, Shengcheng Mao, Ze Zhang, Xiaodong Han
Source: Journal of Materials Research and Technology, Vol 33, Iss, Pp 8967-8973 (2024)
Publisher Information: Elsevier BV, 2024.
Publication Year: 2024
Subject Terms: Fracture, Mining engineering. Metallurgy, Nickel-based superalloy DD6, TN1-997, High resolution TEM, In-situ TEM, Thermal and mechanical testing holder
Description: The fracture failure mechanism of high-temperature structural materials plays a vital role in the application of high-temperature structural materials. Transmission electron microscopy (TEM) is a unique tool providing the internal microstructures and defects of images in samples with up to atomic resolution. However, great challenges are posed to the realization of atomic-scale observation under thermal-mechanical coupling conditions in TEM. In this work, a thermomechanical testing apparatus combining micro-electro-mechanical system (MEMS) technology with a miniature piezoelectric ceramic inside TEM was developed, which enabled in-situ mechanical testing and high-resolution TEM analysis at elevated temperatures up to 873 K. This unique technique was used to investigate the atomic-scale fracture mechanism of nickel-based superalloy DD6 at high temperatures and stress for the first time. The fracture mode where cracks propagate along the γ and γ′ phase interfaces was proposed. Furthermore, the role of 60° full dislocations at the crack tip in crack propagation was revealed.
Document Type: Article
ISSN: 2238-7854
DOI: 10.2139/ssrn.4953667
DOI: 10.1016/j.jmrt.2024.11.194
Access URL: https://doaj.org/article/07f96332fb424f7cbe06e35963961653
Rights: CC BY NC ND
Accession Number: edsair.doi.dedup.....159d40f2bf10788c20a02f454f36e034
Database: OpenAIRE
Description
Abstract:The fracture failure mechanism of high-temperature structural materials plays a vital role in the application of high-temperature structural materials. Transmission electron microscopy (TEM) is a unique tool providing the internal microstructures and defects of images in samples with up to atomic resolution. However, great challenges are posed to the realization of atomic-scale observation under thermal-mechanical coupling conditions in TEM. In this work, a thermomechanical testing apparatus combining micro-electro-mechanical system (MEMS) technology with a miniature piezoelectric ceramic inside TEM was developed, which enabled in-situ mechanical testing and high-resolution TEM analysis at elevated temperatures up to 873 K. This unique technique was used to investigate the atomic-scale fracture mechanism of nickel-based superalloy DD6 at high temperatures and stress for the first time. The fracture mode where cracks propagate along the γ and γ′ phase interfaces was proposed. Furthermore, the role of 60° full dislocations at the crack tip in crack propagation was revealed.
ISSN:22387854
DOI:10.2139/ssrn.4953667