Mechanical property enhancement in gradient structured aluminum alloy by ultrasonic nanocrystalline surface modification

Oh, Juhee; Park, Hae Don; Gwak, Minseok; Lee, Jungsub; Son, Sujung; Amanov, Auezhan; Kim, Hyoung Seop; Seol, Jae Bok; Sung, Hyokyung; Kim, Jung Gi

doi:10.1016/j.msea.2021.141101

Cited by 21 publications

(5 citation statements)

References 47 publications

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“…The UNSM treatment enhanced the strength and retained a high ductility of the LZ91 alloy, which was due to the trade‐off between strength and ductility remains a challenge in their use as structural materials. Some studies also have used UNSM treatment to refine the material surface grain and increase the hardness for an overall improvement in the mechanical properties of alloys 25–27 …”

Section: Resultsmentioning

confidence: 99%

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Enhanced low‐cycle fatigue behavior LZ91 Mg–Li alloy with ultrasonic nanocrystal surface modification

Zou

Shen

et al. 2023

Fatigue Fract Eng Mat Struct

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Ultrasonic nanocrystal surface modification (UNSM) is widely used to improve the high-cycle fatigue properties of metals. However, research on the effect of UNSM on the low-cycle fatigue behavior of metals, particularly magnesium (Mg) alloys, is limited. In this study, the LZ91 Mg-Li alloy is strengthened using UNSM. The microstructures, surface roughness, tensile properties, and low-cycle fatigue properties of the strengthened LZ91 alloy are measured. The results reveal that the surface roughness decreases and the hardness increases significantly after UNSM treatment, particularly the hardness of the α phase. Furthermore, the α phase is elongated and aligned along the direction of processing rotation. When fatigue cracks encounter the hardened α phase, they follow an easier expansion direction. Therefore, the crack extension mode changes to increase the fatigue life of the LZ91 alloy. K E Y W O R D S fatigue cracking, low-cycle fatigue, Mg-Li alloy, ultrasonic nanocrystal surface modification Highlights • The UNSM treatment improves the mechanical properties of LZ91 Mg-Li alloy. • The hardened α phase changed the crack expansion pattern after UNSM treatment. • The UNSM treatment improves the fatigue life of LZ91 Mg-Li alloy. | INTRODUCTIONMg-Li alloys are green engineering materials in the 21st century and have attracted considerable attention in various fields because of their low density, high specific strength, stiffness, good processing, and recycling properties. 1,2 The LZ91 Mg-Li alloy has multiple applications in various fields. In the aerospace industry, it can be used to construct rocket cabin bodies and lunar landing platform components. In the field of weapons, it can be utilized as missile tails, shells, armor, and bulletproof material. 3,4 However, these components are subjected to cyclic deformation or vibration caused by factors such as airflow and weather. 5 This can lead to low-cycle fatigue damage. Owing to their low strength and hardness, poor formability, and difficulty in obtaining high-quality surface properties, the widespread use of Mg-Li alloys is limited. Hence, the surface integrity

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Section: Resultsmentioning

confidence: 99%

“…Some studies also have used UNSM treatment to refine the material surface grain and increase the hardness for an overall improvement in the mechanical properties of alloys. [25][26][27]…”

Section: Microhardness and Tensile Propertiesmentioning

confidence: 99%

Enhanced low‐cycle fatigue behavior LZ91 Mg–Li alloy with ultrasonic nanocrystal surface modification

Zou

Shen

et al. 2023

Fatigue Fract Eng Mat Struct

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“…This event was also detected in other works related to the GNG structures. 17,57,58 The up-turn feature in the GNG materials is attributed to the fact that the geometrically necessary dislocations, recognized as the source of long-range back-stresses, are activated to undo the applied stress and hinder the dislocation slip in the soft regions, 59 which finally leads to the balance of internal strain in the system. 60 Moreover, there also exists a downward trend in the plots, implying the evolution of grain resizing in the microstructure, which is discussed previously in Figure 9.…”

Section: Resultsmentioning

confidence: 99%

The characterization of plastic behavior and mechanical properties in the gradient nanostructured copper

Siswanto

Romero-Parra

Sivaraman

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Due to their individual plastic deformation behavior and mechanistic performances, gradient nano-grained (GNG) metals have been identified as promising materials for application in advanced engineering applications. However, their plasticity mechanism has not been thoroughly investigated. Hence, in this work, molecular dynamics simulation was employed to characterize the atomistic behavior of copper GNG structures under tensile loading with different grain sizes (2–9 nm) at varied temperatures (100, 300, and 600 K). The results indicated that there existed a critical grain size value (6 nm) for the Hall–Petch and inverse Hall–Petch relationship. Besides, it was found that the high-temperature loading (600 K) negatively affected the plasticity-induced strengthening, while low-temperature loading induced outstanding plasticity-induced strengthening owing to the excessive strain hardening events. The details of plastic deformation from the perspective of grain boundary, deformation twining, stacking faults, and dislocations were analyzed and a thorough discussion was presented to elucidate the grain size and temperature effects on the plasticity mechanism.

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“…In the UNSM process, the primary function of the spherical roller tip is to create a mechanical impact and produce the SPD. In the case of USRP, the primary function of the spherical roller tip is to perform DR. Scholars adopted UNSM techniques on different steel grades [90][91][92][93][94], titanium alloys [95][96][97][98], aluminum alloys [99][100][101], and magnesium alloys [102,103], nickel alloys [89,104], copper alloys [105,106], shape memory alloys [107,108] high entropy alloys [109][110][111] and thus observed a significant enhancement in surface mechanical properties and surface integrity. In addition, there are advancements in USNM techniques, such as electropulsing-assisted UNSM and laser-assisted UNSM [112,113].…”

Section: Applications and Recent Advances Of Usrpmentioning

confidence: 99%

Ultrasonic Surface Rolling Process: Properties, Characterization, and Applications

et al. 2021

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Ultrasonic surface rolling process (USRP) is a novel surface severe plastic deformation (SPD) method that integrates ultrasonic impact peening (UIP) and deep rolling (DR) to enhance the surface integrity and surface mechanical properties of engineering materials. USRP can induce gradient nanostructured surface (GNS) layers on the substrate, providing superior mechanical properties, thus preventing premature material failure. Herein, a comprehensive overview of current-state-of-the art USRP is provided. More specifically, the effect of the USRP on a broad range of materials exclusively used for aerospace, automotive, nuclear, and chemical industries is explained. Furthermore, the effect of USRP on different mechanical properties, such as hardness, tensile, fatigue, wear resistance, residual stress, corrosion resistance, and surface roughness are summarized. In addition, the effect of USRP on grain refinement and the formation of gradient microstructure is discussed. Finally, this study elucidates the application and recent advances of the USRP process.

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Mechanical property enhancement in gradient structured aluminum alloy by ultrasonic nanocrystalline surface modification

Cited by 21 publications

References 47 publications

Enhanced low‐cycle fatigue behavior LZ91 Mg–Li alloy with ultrasonic nanocrystal surface modification

Enhanced low‐cycle fatigue behavior LZ91 Mg–Li alloy with ultrasonic nanocrystal surface modification

The characterization of plastic behavior and mechanical properties in the gradient nanostructured copper

Ultrasonic Surface Rolling Process: Properties, Characterization, and Applications

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