Journal
PROGRESS IN MATERIALS SCIENCE
Volume 123, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pmatsci.2021.100854
Keywords
High-entropy alloys; Atom probe tomography; Atomic-scale structure; 3D local chemistry; High performance
Categories
Funding
- National Key Research and Development Project [2017YFB0702204]
- National Natural Science Foundation of China [51701097, 51604156, 51571120]
- Natural Science Foundation of Jiangsu Province [BK20170843]
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High-entropy alloys, with their unique and complex microstructures, exhibit extraordinary mechanical properties that are crucially dependent on a comprehensive understanding of their microstructures down to atomic level, recent applications of atom probe tomography (APT) have emerged as an important tool in studying HEAs, providing insights into their atomic-scale structural and chemical information and assisting in understanding the high-performance characteristics of HEAs.
High-entropy alloys (HEAs), also called multi-principal-elements alloys, possess extraordinary mechanical properties, including high strength and hardness, thermal stability, corrosion resistance and radiation resistance, due to their unique and complex microstructures. The comprehensive understanding of their microstructures down to atomic level plays a vital role in developing HEAs, for tuning manufacturing parameters, examining their phase stabilities under severe conditions for future applications, and determining origins of their excellent mechanical properties. The expansion of the fundamental knowledge of the microstructure strongly relies on the advance of high-resolution analytical techniques. As a state-of-the-art technique, atom probe tomography (APT), with a high spatial resolution and ability in detecting individual atoms, has emerged as an important tool in studying HEAs. Herein, an effort is made to review the recent application of APT in understanding HEAs. It begins with the experimental approaches in using APT to reveal atomic-scale structural and chemical information of HEAs, and follows by typical applications of APT in high-performance HEAs processed by different routes, understanding their microstructural stability, and structure?property relationships. Finally, major challenges and perspectives in APT applications to address fundamental science of HEAs are discussed.
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