文章信息/Info

Title:

Research Progress on Serrated Flow Behavior in High-Entropy Alloys

文章編號:

1674-3962(2025)01-0061-13

作者:

劉博浩; 郝榮; 喬珺威

太原理工大學(xué)材料科學(xué)與工程學(xué)院，山西 太原 030024

Author(s):

Liu Bohao;  Hao Rong;  Qiao Junwei

College of Materials Science and Engineering, Taiyuan University of Technology， Taiyuan 030024， China

關(guān)鍵詞:

高熵合金; 鋸齒流變; PLC效應(yīng); 臨界應(yīng)變; 平均場理論; 數(shù)字圖像相關(guān)法

Keywords:

high-entropy alloys;  serrated flow;  PLC effect;  critical strain;  mean-fileld theory;  digital image correlation

分類號:

TG139

DOI:

10.7502/j.issn.1674-3962.202410007

文獻標(biāo)志碼:

A

摘要:

高熵合金由于其獨特的合金組成和多種元素的均勻分布，展現(xiàn)出了傳統(tǒng)合金無法比擬的優(yōu)異力學(xué)性能、熱穩(wěn)定性和耐腐蝕性。因此，這類新型材料近年來成為材料科學(xué)領(lǐng)域的研究熱點之一。在高熵合金的塑性變形過程中，鋸齒流變行為是一種十分重要且典型的現(xiàn)象，它通常表現(xiàn)為應(yīng)力�矐�(yīng)變曲線中的不規(guī)則波動。該行為揭示了材料內(nèi)部復(fù)雜的動力學(xué)機制，與動態(tài)應(yīng)變時效和位錯運動等微觀結(jié)構(gòu)演變密切相關(guān)。研究表明，在不同的外部條件下，鋸齒流變行為會呈現(xiàn)出不同的特征，并對材料的力學(xué)性能產(chǎn)生顯著影響。近年來，學(xué)者們在鋸齒流變行為的發(fā)生機理、影響因素及其對高熵合金材料性能的作用機理方面進行了廣泛的研究，揭示了高熵合金內(nèi)部位錯滑移、局部應(yīng)變集中等現(xiàn)象的本質(zhì)。系統(tǒng)綜述了高熵合金中鋸齒流變行為的最新研究進展，重點討論了鋸齒流變行為的理論基礎(chǔ)、實驗方法以及特征參數(shù)的定量分析，旨在為進一步提高高熵合金的力學(xué)性能和工程應(yīng)用提供理論指導(dǎo)。

Abstract:

High-entropy alloys (HEAs) exhibit outstanding mechanical properties, thermal stability, and corrosion resistance due to their unique alloy compositions and the uniform distribution of multiple elements. Consequently, these novel materials have become a research hotspot in the field of materials science in recent years. Serrated flow behavior is a significant and characteristic phenomenon observed during the plastic deformation of high-entropy alloys, typically manifested as irregular fluctuations in the stress-strain curve. This behavior reveals the complex dynamic mechanisms within the material and is closely related to microstructural evolution, such as dynamic strain aging and dislocation movement. Studies have shown that serrated flow behavior presents different characteristics under various external conditions, significantly impacting the mechanical properties of the materials. In recent years, researchers have extensively investigated the mechanisms behind serrated flow behavior, its influencing factors, and its effects on the performance of high�瞖ntropy alloy materials, uncovering the essence of phenomena such as dislocation slip and localized strain concentration within these alloys. This article systematically reviews the latest research progress on serrated flow behavior in high-entropy alloys, focusing on the theoretical foundations,experimental methods, and quantitative analysis of characteristic parameters.The aim is to provide theoretical guidance for further improving the mechanical performance and engineering applications of high-entropy alloys.