Physical Metallurgy RecapLecture #4

John Hanson9/20/12

3D to 2D Projections

100 Stereographic Projection (Cubic Crystal)

3D to 2D Projections

100 Stereographic Projection (Cubic Crystal)

3D to 2D Projections

100 Stereographic Projection (Cubic Crystal)

3D to 2D Projections

48 symmetric triangles

Studying anisotropies requires measuring over 4π/48 rather than the entire sphere

Anisotropy and Material PropertiesProperties

Anisotropy and Material PropertiesProperties Single vs. Poly Crystals

Anisotropy and Material PropertiesProperties Single vs. Poly Crystals

Processing

Random

Anisotropy and Material PropertiesProperties Single vs. Poly Crystals

Processing

Random

RollingDrawing

Anisotropy and Material PropertiesProperties Single vs. Poly Crystals

Processing

Random Preferred

RollingDrawing

Euler Angles

• Series of three rotations:

Source: Euler Angles - Wikipedia

Euler Angles

• Series of three rotations:

Source: Euler Angles - Wikipedia

13

My Work: Hydrogen Embrittlement• In situ TEM straining is

employed to further study “strongest links”

14

• In situ TEM straining is employed to further study “strongest links”

• Prior to straining, EBSD is used to map grain structure of sample

100 μm

SEM image

My Work: Hydrogen Embrittlement

15SEM image overlaid with EBSD data

My Work: Hydrogen Embrittlement

• Inconel 725

• Pure Nickel

SEM image overlaid with EBSD data

My Work: Hydrogen Embrittlement

• Pure Nickel

SEM image overlaid with EBSD data

My Work: Hydrogen Embrittlement

Questions/comments?