Caustic stress corrosion cracking has only been superficially examined in aluminum alloys. In caustic (basic) environments, the inherent, protective oxide layer becomes soluble on aluminum and allows for further degradation. The purpose of this study is to observe the effect of a strong base solution (sodium, hydroxide, sodium hypochlorite, sodium silicate, pH ~12) on the strength and stress-st...

This paper presents deformation and cracking phenomena associated with the cold spray of nanoscale surface oxide layers 6061 Al alloy powders. The structure top film was revealed via Focused Ion Beam (FIB), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS). observations show layer characteristics most likely matches crystalline γ-Al 2 O 3 . Phenomena contacts, conta...

Sandwich structures used to lightweight telescope mirrors result in subsurface pore or cell-induced surface deformation (called quilting), the unsupported sub-surface regions, during diamond turning of optical surface. An alternative sandwich structure is metal foams made by melt route which have a monolithic porous-nonporous interface naturally formed gravitationally induced drainage effect. T...

This paper introduces an experimental technique to investigate dynamic friction characteristics of sliding interfaces at normal pressures up to 125 MPa, slip speeds up to 15 m/s and slip distances of approximately 10 mm. This new apparatus involves a novel modification of the conventional torsional Kolsky bar apparatus employed extensively in the past to investigate high-strain-rate behavior of...

Abstract Cold spray is considered as an emerging technique for preparing wear-resistant metal matrix composite coatings on the surface of various kinds metallic materials. In this work, a viable strategy “cold spraying + hot rolling post-treatment” was successfully applied to prepare B 4 C/6061 Al coating commercially available 6061 plates. The results revealed that post-treatment in uniform di...

Aluminum based hybrid metal matrix composite with more than two particle reinforcement is very much popular for heavy duty application, and the proportion of these can be controlled to achieve desired mechanical properties (strength wear resistance). AA 6061 alloys popularly used in aircraft automobile applications, tends have inferior tribological property therefore reinforcements are being ma...