A new approach of a gradient nanograined surface layer for Mg-3Al-1Zn alloy induced by SMRGT

Chen, Biqiang; Zhang, Guifeng; Zhang, Linjie; Xu, Tingting

doi:10.1007/s00170-017-0977-7

Cited by 11 publications

(3 citation statements)

References 32 publications

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“…It is well known that producing a fine-grained microstructure in metal improves its mechanical properties [ 26 , 27 ]. Nanostructured materials can be created using techniques based on SPD, such as, e.g., equal channel angular pressing (ECAP), grinding, or modified rolling [ 28 , 29 , 30 , 31 ]. The reduction of grain size is accompanied by other microstructural changes, e.g., the introduction of internal stresses, texture development, or increase in density of crystal lattice defects [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

et al. 2020

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Surface mechanical attrition treatment (SMAT) was used to generate a gradient microstructure in commercial grade magnesium. Positron annihilation lifetime spectroscopy and variable energy positron beam measurements, as well as microhardness tests, electron backscatter diffraction, X-ray diffraction, and electrochemical corrosion tests, were used to investigate the created subsurface microstructure and its properties. It was found that SMAT causes an increase in dislocation density and grain refinement which results in increased hardness of the subsurface zone. The mean positron lifetime values indicate trapping of positrons in vacancies associated with dislocations and dislocation jogs. The increase of the SMAT duration and the vibration amplitude influences the depth profile of the mean positron lifetime, which reflects the defect concentration profile. Electrochemical measurements revealed that the structure induced by SMAT increases the susceptibility of magnesium to anodic oxidation, leading to the enhanced formation of hydroxide coverage at the surface and, as a consequence, to the decrease in corrosion current. No significant effect of the treatment on the residual stress was found.

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Section: Introductionmentioning

confidence: 99%

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

et al. 2020

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“…In the rolling process as mentioned above, elastic deformation and plastic deformation in the surface layer of a workpiece would result in dislocation configuration change and phase change. At the same time, subgrains of the rolling layer are refined to form gradient nanocrystalline layer [17][18][19]. After rolling, the roughness of the workpiece surface can be reduced [20], the work hardening Surface rolling strengthening technology was initially mainly used for surface strengthening of low carbon steel, alloy steel, pure aluminum, brass, and other metal materials in the 20th century.…”

Section: Introductionmentioning

confidence: 99%

“…Coatings 2020, 10, 611 3 of 11 the same time, subgrains of the rolling layer are refined to form gradient nanocrystalline layer [17][18][19]. After rolling, the roughness of the workpiece surface can be reduced [20], the work hardening phenomenon can be produced [21,22], and residual compressive stress can be introduced on the workpiece surface [23], which can prevent the occurrence of fatigue failure and improve the fatigue strength and fatigue life of the workpiece [24,25].…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanical Properties of 210Cr12 Shaft Surface Processed with Rolling

Qiao

Chen

et al. 2020

Coatings

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The rolling process is one of the most effective ways for strengthening a part’s surface. As the press force exerted on specimen in rolling process, material in the surface layer will deform plastically if the press force is sufficient. That might result in grain refinement, dislocation configuration change, or phase change in specimen surface layer material. Consequently, the surface material mechanical properties can be changed. The effects of rolling parameters on surface residual stress, micro-hardness, and surface roughness for a 210Cr12 shaft have been investigated. After the rolling process, the surface residual stress of the specimen changes from tensile stress to compressive stress, and a stable residual compressive stress layer is formed. The maximum absolute value of compressive stress can be up to 216MPa. With the increase of the value of contact stress exerted on shaft surface and the number of rolling cycles, the absolute value of residual compressive stress increases firstly and then becomes stable. With the increase of depth from shaft surface to interior, the absolute value of residual compressive stress increases initially, then decreases and disappears finally. The maximum absolute value of residual compressive stress exists at the position beneath specimen surface about 0.025mm. The depth of residual stress layer is about 0.2 mm. Research results indicate that shaft surface microhardness can be improved within small range, surface roughness can be reduced up to 67%.

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Influence of relative tool sharpness (RTS) on different ultra-precision machining regimes of Mg alloy

Rahman

Kumar

2018

Int J Adv Manuf Technol

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A new approach of a gradient nanograined surface layer for Mg-3Al-1Zn alloy induced by SMRGT

Cited by 11 publications

References 32 publications

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

Research on Mechanical Properties of 210Cr12 Shaft Surface Processed with Rolling

Influence of relative tool sharpness (RTS) on different ultra-precision machining regimes of Mg alloy

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