Investigations into Microstructure Evolution and Hardening Effect during Ultrasonic Vibration Assisting Hot Compression for High-Strength Aluminum Alloy

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2025-03-13 DOI:10.1007/s11665-025-10986-0

Chenchen Zhang, Yifu Jiang, Xuan Luo

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Abstract

Ultrasonic-assisted technology is an efficient method to improve the plasticity of the material. In this paper, ultrasonic vibration was conducted during hot compression test for AA7B04 alloy, and the evolution of microstructure and hardness under different vibration amplitude conditions were discussed in detail through transmission electron microscope (TEM), electron backscattered diffraction (EBSD) and microhardness test. The results show that the specimens under the case of ultrasonic vibration exhibiting the larger size of η´ and η phase when comparing with the ones with only hot compression, indicating the promoting function of nucleation and growth of precipitation. The main recrystallized mechanism is CDRX during ultrasonic vibration assisting hot compression, relying on the climb and slip of dislocations. High fraction of recrystallization were caused by ultrasonic vibration, and the specimens with 5.3 specimen vibration amplitude could reach 61.47%. Besides that, Goss texture were weakened during ultrasonic vibration assisting hot compression. Because of the comprehensive influence of large size of η´ (softening effect) and refined grain size (hardening effect), a slight decreased trend of hardness value is observed for the specimens under ultrasonic vibration assisting hot compression.

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高强铝合金超声振动辅助热压缩组织演变及硬化效应研究

超声辅助技术是提高材料塑性的有效方法。本文对AA7B04合金在热压缩试验中进行超声振动，通过透射电镜（TEM）、电子背散射衍射（EBSD）和显微硬度测试，详细讨论了不同振动振幅条件下合金的显微组织和硬度的演变。结果表明：超声振动试样的η′和η相尺寸比单纯热压缩试样大，表明超声振动对析出物的形核和生长有促进作用；超声振动辅助热压缩过程中CDRX的再结晶机制主要是依靠位错的爬升和滑移。超声振动引起的再结晶率较高，振动幅值为5.3的试样可达到61.47%。超声辅助热压缩作用下，高斯织构被削弱。由于大η′尺寸（软化效应）和细晶粒尺寸（硬化效应）的综合影响，超声振动辅助热压缩下试样的硬度值略有下降趋势。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered