Achieving gradient heterogeneous structure in Mg alloy for excellent strength-ductility synergy

Han, Jing; Sun, Jiapeng; Song, Yuanming; Xu, Bingqian; Yang, Zhen; Xu, Shijie; Han, Ying; Wu, Guosong; Zhao, Jun

doi:10.1016/j.jma.2021.09.021

Cited by 30 publications

(6 citation statements)

References 82 publications

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“…Therefore, the DS-USSR sample has a sample-level GS. Our previous studies indicated that USSR generates a high gradient strain and strain rate, and thus induces a thicker GS [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…Ultrasonic severe surface rolling (USSR) is a newly developed technology to prepare a thick GS surface layer and has been applied to selective laser melted 316L stainless steel and ZE41 Mg alloy for superior strength and ductility [ 28 , 29 ]. The USSR technology exhibits advanced capabilities of effectively producing large-scale, geometrically complex samples with GS surface layers with a smooth surface.…”

Section: Introductionmentioning

confidence: 99%

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Preparing Thick Gradient Surface Layer in Cu-Zn Alloy via Ultrasonic Severe Surface Rolling for Strength-Ductility Balance

Sun

et al. 2022

Materials

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A gradient structure (GS) design is a prominent strategy for strength-ductility balance in metallic materials, including Cu alloys. However, producing a thick GS surface layer without surface damage is still a challenging task limited by the available processing technology. In this work, a gradient structure (GS) surface layer with a thickness at the millimeter scale is produced in the Cu-38 wt.% Zn alloy using ultrasonic severe surface rolling technology at room temperature. The GS surface layer is as thick as 1.1 mm and involves the gradient distribution of grain size and dislocation density. The grain size is refined to 153.5 nm in the topmost surface layer and gradually increases with increasing depth. Tensile tests indicate that the single-sided USSR processed alloy exhibits balanced strength (467.5 MPa in yield strength) and ductility (10.7% in uniform elongation). Tailoring the volume fraction of the GS surface layer can tune the combination of strength and ductility in a certain range. The high strength of GS surface layer mainly stems from the high density of grain boundaries, dislocations and dislocation structures, deformation twins, and GS-induced synergistic strengthening effect. Our study elucidates the effect of the thick GS surface layer on strength and ductility, and provides a novel pathway for optimizing the strength-ductility combination of Cu alloys.

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“…Therefore, the DS-USSR sample has a sample-level GS. Our previous studies indicated that USSR generates a high gradient strain and strain rate, and thus induces a thicker GS [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparing Thick Gradient Surface Layer in Cu-Zn Alloy via Ultrasonic Severe Surface Rolling for Strength-Ductility Balance

Sun

et al. 2022

Materials

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“…After UNSM, the strength of AISI 304 stainless steel improved from 340 MPa to 630 MPa while still preserving high ductility. Recently, a modified USR method, called ultrasonic severe surface rolling (USSR), was proposed by Han et al to obtain a superior gradient surface layer [ 10 ]. USSR produces a high strain rate of approximately 10 5 /s, which is much higher than many other techniques of preparing GNSs, such as SMAT (10 2 ~10 3 /s), SMGT (10 3 ~10 4 /s), and SMRT (10 3 ~10 4 /s) [ 2 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a modified USR method, called ultrasonic severe surface rolling (USSR), was proposed by Han et al to obtain a superior gradient surface layer [ 10 ]. USSR produces a high strain rate of approximately 10 5 /s, which is much higher than many other techniques of preparing GNSs, such as SMAT (10 2 ~10 3 /s), SMGT (10 3 ~10 4 /s), and SMRT (10 3 ~10 4 /s) [ 2 , 10 ]. USSR applies a large static force on the treated surface for forming a large gradient plastic strain.…”

Section: Introductionmentioning

confidence: 99%

“…Constructing gradient nanostructures (GNSs) have been proven to be a good strategy for enhancing the mechanical properties of metals and alloys inspired by nature [1,2]. Over the past two decades, this strategy has been successfully applied in almost all types of structural metallic materials [3][4][5][6][7], such as Cu and Cu alloys [8,9], Mg alloys [10,11], and Ti alloys [12,13]. Several methods have been developed to prepare the gradient nanostructure, such as surface mechanical grinding treatment (SMGT) [3], surface mechanical attrition treatment (SMAT) [14], surface mechanical rolling treatment (SMRT) [15], laser shock peening (LSP) [16], ultrasonic surface rolling (USR), or ultrasonic nanocrystalline surface modification (UNSM) [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Gradient Nanostructured Q345 Steel Prepared by Ultrasonic Severe Surface Rolling

Meng

Feng

et al. 2023

Scanning

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In this work, ultrasonic severe surface rolling (USSR), a new surface nanocrystallization technique, is used to prepare gradient nanostructure (GNS) on the commercial Q345 structural steel. The microstructure of the GNS surface layer is characterized by employing EBSD and TEM, and the result indicates that a nanoscale substructure is formed at the topmost surface layer. The substructures are composed of subgrains and dislocation cells and have an average size of 309.4 nm. The GNS surface layer after USSR processing for one pass has a thickness of approximately 300 μm. The uniaxial tensile measurement indicates that the yield strength of the USSR sample improves by 25.1% compared to the as-received sample with slightly decreased ductility. The nanoscale substructure, refined grains, high density of dislocations, and hetero-deformation-induced strengthening are identified as responsible for the enhanced strength. This study provides a feasible approach to improving the mechanical properties of structural steel for wide applications.

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Investigation on the mechanical behaviors of porous Al–Mg honeycombs with grain boundary affect zone segregated structure

Guo

Meng

et al. 2023

J Nanopart Res

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Achieving gradient heterogeneous structure in Mg alloy for excellent strength-ductility synergy

Cited by 30 publications

References 82 publications

Preparing Thick Gradient Surface Layer in Cu-Zn Alloy via Ultrasonic Severe Surface Rolling for Strength-Ductility Balance

Preparing Thick Gradient Surface Layer in Cu-Zn Alloy via Ultrasonic Severe Surface Rolling for Strength-Ductility Balance

Microstructure and Mechanical Properties of Gradient Nanostructured Q345 Steel Prepared by Ultrasonic Severe Surface Rolling

Investigation on the mechanical behaviors of porous Al–Mg honeycombs with grain boundary affect zone segregated structure

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