Structure-property relationships in laser assisted and mechanically deformed advanced materials

University of Groningen

Structure-property relationships in laser assisted and mechanically deformed advanced

materials

Fidder, Herman

DOI:

10.33612/diss.143468882

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Publication date: 2020

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Citation for published version (APA):

Fidder, H. (2020). Structure-property relationships in laser assisted and mechanically deformed advanced materials. University of Groningen. https://doi.org/10.33612/diss.143468882

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Stellingen

STRUCTURE-PROPERTY RELATIONSHIPS IN LASER ASSISTED

AND MECHANICALLY DEFORMED ADVANCED MATERIALS

door

Herman Fidder

01. Even though there is no significant change in hardness of the specimens produced by the various forming processes, there exists a noticeable difference in the appearance of the microstructure. (Chapter 4)

02. Laser forming utilizes plastic deformation at high temperatures, while mechanical forming at room temperature is characterized by plastic deformation at low temperature. (Chapter 5) 03. Laser-formed specimens show a high degree of heterogeneity throughout the material

resulting in higher residual stress gradients. (Chapter 5)

04. The bending rate during the laser forming process is constant and increases as the laser beam moves over the final plate edge.(Chapter 6)

05. For multiple overlapping tracks the final bending angle per track varies for each of the processing parameters (laser power and scanning speed) but decreases to an asymptotic value. (Chapter 6)

06. Stress gradients across the tension twin-parent interface are compressive in nature, with the maximum stresses recorded at the twin boundary. (Chapter 7)

07. Stress profiles at twin grain boundary intersections show a sign reversal, being compressive inside the twin and tensile in the neighboring grain. (Chapter 7)

08. Ptychography is the way to go in dynamic electron microscopy. (Jeff Th M DeHosson) 09. Society should explore science-for-sale rather than science-on-sale.

10. The beauty of a corona, a pearl-colored glow in the universe, turns out an ambiguous one (corona is a pandemic, WHO, Wed March 11, 2020).