An Impact of the Recent Developments in Coating Materials and Techniques on the Corrosion Response of AZ91D Alloy: A Review

Kumbhar, Nilesh K.; Joshi, Manjunath V.; Kumar, Vikram; Hosmani, Santosh S.

doi:10.1002/adem.202201680

Cited by 8 publications

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References 222 publications

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Section: Introductionmentioning

confidence: 99%

“…Since the AZ91D is a popular magnesium alloy that offers several advantages (like better castability, good corrosion resistance, enhanced creep resistance, etc.) over the other grades of magnesium alloys, [4,5] it is chosen in this study.Severe plastic deformation (SPD) techniques are employed in recent studies to improve surface properties, where alloys are processed to achieve significant grain refinement, enhanced mechanical properties, and improved performance. Equal channel angular pressing (ECAP), cryogenic rotary swaging, constrained groove pressing, shot peening, high-pressure torsion (HPT), and surface mechanical attrition treatment (SMAT) are some of the important SPD techniques.…”

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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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Section: Introductionmentioning

confidence: 99%

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confidence: 99%