文章信息/Info

Title:

Research Progress on Nanoprecipitation-Strengthened High-Entropy Alloys

文章編號:

1674-3962(2025)01-0031-09

作者:

郭嘉鳴; 倪冰雨; 焦增寶

1. 香港理工大學機械工程學系，香港特別行政區 2. 香港理工大學深圳研究院，廣東 深圳 518057

Author(s):

GUO Jiaming;  NI Bingyu;  JIAO Zengbao

1 Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China 2 The Hong Kong Polytechnic University Shenzhen Research Institute,Shenzhen 518057, China

關鍵詞:

高熵合金; 析出強化; 析出組織; 復合析出; 力學性能

Keywords:

high-entropy alloys;  precipitation strengthening;  precipitate microstructure;  co-precipitation;  mechanical properties

分類號:

TG139;TB383

DOI:

10.7502/j.issn.1674-3962.202410004

文獻標志碼:

A

摘要:

納米析出強化是提高高熵合金強度的重要方法，理解納米析出相的形成機理及其對高熵合金力學性能的影響機制，對設計和開發高性能高熵合金具有重要意義。系統綜述了納米析出強化高熵合金的研究進展和未來展望，重點討論了共格析出、非共格析出和復合析出等不同析出形式對高熵合金力學行為和強韌化機制的影響。共格析出相憑借其與基體良好的晶格匹配性和應力傳遞能力，在顯著強化合金的同時保持了良好的塑性；非共格析出相可顯著增強合金的加工硬化能力，但需要合理調控其形貌、尺寸和分布，并充分利用高熵合金基體優異的塑性和應變硬化能力，也可以實現強韌性的良好匹配；多種納米相的復合析出可有效發揮不同析出相的集成優勢，為高熵合金的性能優化提供了新思路。需要指出，盡管納米析出強化高熵合金極具應用前景，但在熱穩定性、高溫性能和工業化生產成本等方面仍面臨挑戰，需要進一步深入研究。對納米析出強化高熵合金的研究現狀和關鍵問題進行了系統歸納，可為今后設計高性能高熵合金提供重要指導依據。

Abstract:

Precipitation strengthening is considered as an effective approach to enhance the strength of high-entropy alloys (HEAs), and understanding of the precipitation mechanisms and the relationship between precipitate microstructure and mechanical properties is crucial for the development of high-performance HEAs. This article provides a comprehensive review of the research progress and future perspectives on nanoprecipitation-strengthened HEAs, with an emphasis on the influence of various types of precipitation, including coherent precipitation, incoherent precipitation, and co-precipitation, on the mechanical behavior and strengthening mechanisms of HEAs. Coherent precipitates can significantly strengthen the alloys while maintaining good ductility, benefiting from their excellent lattice matching and stress transfer with the matrix. Incoherent precipitates can provide high work hardening, but it is important to reasonably tailor their morphology, size, and distribution, and to fully utilize the excellent ductility and strain hardening capability of the matrix, in order to achieve a good strength-ductility balance in HEAs.Furthermore, the co-precipitation method can take the advantages of various types of precipitates, which opens new opportunities for optimizing mechanical properties of HEAs. Despite the great promise, nanoprecipitation�瞫trengthened HEAs still face challenges in terms of thermal stability, elevated�瞭emperature performance, and cost, which require further research efforts in the future. This review presents the recent advancement and key issues of nanoprecipitation-strengthened HEAs, which can provide useful guidelines for the development of advanced HEAs for technological applications.