Effect of Trace Sc Addition on Aging Precipitation and Fatigue Crack Propagation Behavior of 7085 Alloy

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-02-20 DOI:10.1111/ffe.14614

Qianqian Ren, Xianjing Deng, Zhiqiang Ru, Ming Liu, Zhimin Pi, Lili Wei, Hongfeng Huang, Degui Li

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引用次数: 0

Abstract

In this work, the effects of Sc-alloying and aging treatments, including T6 peak-aging and retrogression with reaging (RRA) on the fatigue crack propagation (FCP) behavior of 7085 alloy, were investigated. The results show that the RRA-treated alloy exhibits high volume fraction of larger sharable η′ phases, wider precipitate free zone (PFZ), and high Schmid factor. These microstructures contribute to frequent transgranular propagation, increasement of ΔK_th, and higher FCP resistance than T6-treated alloy. Sc alloying can significantly refine grain structure, inhibit recrystallization, and accelerate the nucleation of η′ strengthening phase, thus improving the mechanical properties of 7085 alloy. However, Sc alloying also tends to induce the occurrence of intergranular propagation due to presence of microscale AlZnMgCuSc phase and fine grain structure with high grain boundary volume fraction. Therefore, Sc alloying plays a negative role in improving the FCP resistance of 7085 alloy.

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微量Sc对7085合金时效析出及疲劳裂纹扩展行为的影响

本文研究了sc合金化和时效处理（T6峰时效和伴时效回退（RRA））对7085合金疲劳裂纹扩展（FCP）行为的影响。结果表明：经rra处理的合金具有较高的可共享η相体积分数、较宽的无析出区（PFZ）和较高的施密德因子。与t6处理的合金相比，这些组织有助于频繁的穿晶扩展、ΔKth的增加和更高的FCP抗力。Sc合金化能显著细化晶粒组织，抑制再结晶，促进η′强化相形核，从而改善7085合金的力学性能。然而，Sc合金由于存在微尺度的AlZnMgCuSc相和高晶界体积分数的细晶组织，也容易诱导晶间扩展的发生。因此，Sc合金化对7085合金抗FCP性能的提高起负作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.