Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Li, Yizhuo; Retraint, Delphine; Gao, Pengfei; Xue, Hongqian; Gao, Tao; Sun, Zhidan

doi:10.3390/met12050785

Cited by 7 publications

(6 citation statements)

References 59 publications

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“…Mechanical changes in the material are indicated by a decrease in the modulus of the material under plastic strain [34]. Several parameters affect the fatigue life: the applied load, surface area, and fatigue [35]. The applied load significantly affects the fatigue life of porous magnesium.…”

Section: Discussionmentioning

confidence: 99%

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

et al. 2023

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In the present study, the effects of human physiological activity levels on the fatigue life of a porous magnesium scaffold have been investigated. First, the dynamic immersion and biomechanical testing are carried out on a porous magnesium scaffold to simulate the physiological conditions. Then, a numerical data analysis and computer simulations predict the implant failure values. A 3D CAD bone scaffold model was used to predict the implant fatigue, based on the micro-tomographic images. This study uses a simulation of solid mechanics and fatigue, based on daily physiological activities, which include walking, running, and climbing stairs, with strains reaching 1000–3500 µm/mm. The porous magnesium scaffold with a porosity of 41% was put through immersion tests for 24, 48, and 72 h in a typical simulated body fluid. Longer immersion times resulted in increased fatigue, with cycles of failure (Nf) observed to decrease from 4.508 × 1022 to 2.286 × 1011 (1.9 × 1011 fold decrease) after 72 hours of immersion with a loading rate of 1000 µm/mm. Activities played an essential role in the rate of implant fatigue, such as demonstrated by the 1.1 × 105 fold increase in the Nf of walking versus stair climbing at 7.603 × 1011 versus 6.858 × 105, respectively. The dynamic immersion tests could establish data on activity levels when an implant fails over time. This information could provide a basis for more robust future implant designs.

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Section: Discussionmentioning

confidence: 99%

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

et al. 2023

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“…SMAT has been employed recently to induce nanocrystalline surface layers and gradient nanostructures in different alloys. [13][14][15][16] The SMAT effect on a 7075-aluminum alloy's torsional fatigue behavior was studied by Li et al [15] The results demonstrated that SMAT could have positive and negative effects on fatigue life, depending on the testing conditions, where factors such as surface roughness, grain refinement and residual stresses affected the results. Applying SMAT leads to a substantial reduction in grain size to the nanoscale within the alloy's surface layer, where the grain size progressively increases from the surface to the core of the material.…”

Section: Doi: 101002/adem202300549mentioning

confidence: 99%

“…[13,42] Such a nonuniform distribution of the microstructural features generates a hardness gradient in the SMATed layer (Figure 11, 12, 14, and19a). Nanomechanical behavior also shows a gradient nature due to the gradient microstructure (Figure [13][14][15][16][17][18]. Attrition of AZ91D specimen surface with higher velocity balls (e.g., %10 m s À1 ) is useful in forming a considerably thicker layer (%3500 μm) with higher hardness (%2 GPa at the surface) and compressive stress (about À281 MPa (max.)…”

Section: Srssmentioning

confidence: 99%

Gradient Microstructure and Properties of Surface Mechanical Attrition–Treated AZ91D Alloy: An Effect of Colliding Balls Velocity

et al. 2023

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The surface properties of the AZ91D alloy are altered using surface mechanical attrition treatment (SMAT), a promising method of severe surface deformation, where the role of process parameters is crucial. In this study, specimens are SMATed using ≈3 and ≈10 m s−1 ball velocities (maintaining a constant percentage coverage). The SMATed specimens show higher twin density near the surface, which is reduced gradually, and twin thickness is increased with increasing depth. Further, high‐velocity balls cause more twin density and better grain refinement (≈32 nm grain size at the surface). The higher ball velocity helps form a considerably thicker gradient layer (≈3500 μm) with higher hardness (≈1.98 GPa) and compressive residual stress (≈281 MPa) within a shorter SMAT duration (≈10 min). Ball velocity also influences nanomechanical properties such as nanohardness, creep resistance, strain rate sensitivity (SRS), etc. The non‐SMATed alloy's SRS is about 0.037–0.040. The gradient microstructure affects SRS. The SRS value near the SMATed surface (where the reduced grain size plays a dominating role) is about 0.018–0.027; however, it drops suddenly to ≈0.01 (with a slight increase in depth), and subsequently, it rises with an increased distance in the SMATed layer (where twins play a dominating role).

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“…The Basquin equation is commonly used to model the fatigue data trend for different numbers of cycles by using the statistical calculation of the S-N curves (Figure 10). The Basquin equation has the form [45][46][47][48][49][50][51][52][53][54][55][56][57]:…”

Section: Fatigue Life Before Corrosion After Corrosionmentioning

confidence: 99%

The Influence of a Corrosive Environment on Fatigue and Mechanical Properties of an Al-Cast Alloy with Higher Fe Content

Kuchariková

Pastierovičová

Tillová

et al. 2023

Metals

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Al has very good corrosion resistance and corrosion properties. The corrosion resistance of Al-cast alloys is different because these alloys contain a lot of elements, especially in secondary alloys, which contain more impurity elements, of which Fe is the most common. This study deals with secondary AlSi7Mg0.3 cast alloys, which contain more Fe and are affected by a chloride corrosive environment. This environment was selected based on the application of castings in the automotive industry. The main object was to research the effect of such an environment on basic mechanical properties and fatigue properties. The results show that a higher Fe content does not lead to a significant reduction in the properties of the casting, and the chloride environment is not so harmful. Therefore, it can be stated that the investigated secondary sand-cast experimental materials can replace primary alloys without losing the required corrosion and mechanical properties.

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Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Cited by 7 publications

References 59 publications

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

Gradient Microstructure and Properties of Surface Mechanical Attrition–Treated AZ91D Alloy: An Effect of Colliding Balls Velocity

The Influence of a Corrosive Environment on Fatigue and Mechanical Properties of an Al-Cast Alloy with Higher Fe Content

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