Alpha & Beta

2 cases · 9 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

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The coasters present a handmake look. The grooves are of different sizes and the octogonal shape is irregular. The pieces presented a weight that suggested that the bright finish is a metallic coating, later identified by EDS analysis as silver coating, typical of a decorative plating.
452
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Aspect Before AnalysisDf - General View
Red painted device where the 50 mm x 50 mm titanium alloy plate was positioned (in the circle). The image presents the target, positioned 100 meters far from the gun, after the shot and the projectile did not perforate the plate, but presented a strong effect, as will be presented in the other figures.
487
VIEW
ML00144 / Aug.2018
Impact of a .380 Winchester on Ti64 Plate
M - Ti6Al4VP - Rolled PlateAp - StructureCd - Non-Pierced
Cm - Aspect Before AnalysisDf - General View

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ML00156 — Antique Silver Plated Decorative PieceM - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Piece that was analysed by non destructive tests. Octogonal shape. Two irregular grooves. The coaster was manufactured in a cooper alloy substrate and a metallic coating. The analysis to reveal the substrate microstructure was conducted on the back of the part, in a non destructive preparation, that included light grinding, polishing and etching.
61
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Aspect Before AnalysisDf - General View
Light grinding the back of the coaster. The surface was only partially ground, removing the metallic coating, and exposing the substrate, that appeared yellow indicating the manufacturing in a cooper alloy.
63
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Preparation TechniqueDf - General View
Back of the coaster showing the region that was prepared for the non destructive analysis. It was ground and polished (the coating was removed), showing the yellow aspect of the substrate, in the left bottom part of the image.
64
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - As polishedDf - General View
Image presenting the back of the coaster where the microstructure of the substrate was identified. The composition of the brass (about 35% Zn) indicates that the expected structure is alpha plus beta. The front of the coaster presents two grooves which surface morphology was analyzed by scanning electron microscopy.
65
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface AspectDf - General View
ML00144 — Impact of a .380 Winchester on Ti64 PlateM - Ti6Al4VP - Rolled PlateAp - StructureCd - Non-Pierced
Aspect of the 3/8" thickness plate, 50 mm x 50 mm, of the titanium alloy, in the face of impact with the projectile. The plate was not perforated by the bullet, but suffered localized plastic deformation.
33
VIEW
ML00144 / Aug.2018
Impact of a .380 Winchester on Ti64 Plate
M - Ti6Al4VP - Rolled PlateAp - StructureCd - Non-Pierced
Cm - Aspect Before AnalysisDf - General View
Other view of the 3/8" thickness plate, 50 mm x 50 mm, of titanium alloy, in the face of projectile impact. The plate suffered a localized plastic deformation, but no perforation.
26
VIEW
ML00144 / Aug.2018
Impact of a .380 Winchester on Ti64 Plate
M - Ti6Al4VP - Rolled PlateAp - StructureCd - Non-Pierced
Cm - Aspect Before AnalysisDf - General View
Other view of the 3/8" thickness plate, 50 mm x 50 mm, of the titanium alloy, in the opposite face of impact. The plate did not suffered perforation but it is fully cracked at the bullet impact. The red painting of the device marked the back surface of the plate where it was in contact.
22
VIEW
ML00144 / Aug.2018
Impact of a .380 Winchester on Ti64 Plate
M - Ti6Al4VP - Rolled PlateAp - StructureCd - Non-Pierced
Cm - Aspect Before AnalysisDf - General View