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Improvement of Surface Integrity of Aa7075-T651 Plate by Non-Rotational Sliding Ball Burnishing Process

SSRN, ISSN: 1556-5068
2024
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    33

Article Description

The effect of non-rotational sliding ball burnishing (NRSBB) parameters on surface roughness and microhardness of the face-milled AA7075-T651 plate was experimentally investigated by response surface methodology (RSM). The optimal parameters improved the longitudinal roughness, transverse roughness and microhardness by 93.7%, 89.3% and 37.3%, respectively. 3D topography analysis showed that lower burnishing depths improved Sa up to 89.5 %. The hardened depth of 700 μm was achieved by burnishing depth of 0.18 mm. SEM-EDS analysis demonstrated the high-probable formation of strengthener intermetallics like MgZn2 at the burnished surface and subsurface. XRD analysis indicated that ultra-fine grain (UFG) and nanostructure (NS) were formed at the burnished surface. Severe deformation at the burnished surface led to a hundredfold increase in dislocation density.

Bibliographic Details

Hossein Roohi; Hamid Baseri; Mohammad Javad Mirnia

Elsevier BV

Multidisciplinary; Burnishing; surface integrity; Roughness; Microhardness.

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