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Demonstration of easy twinning for shear on 111 planes in FCC and that twinning is not possible for 0001 planes in HCP - both close-packed planes. Easy martensitic shear is possible transforming from FCC to HCP and vice versa. The HCP martensitic structure that is created in the FCC phase by the shear on every other plane is known as epsilon martensite in steels.

Twinning, which is a bulk shear occurs by Schockley partial slip on each successive plane

Demonstration of 10-11 twinning showing how the 2nd undistorted plane is (0001) - basal

Illustrates how twinning occurs on 10-12 planes in a HCP crystal such as Zr. The second undistorted plane is the basal plane (0001).

Twinning on {1 102} in HCP

Twinning on {1 101} in HCP

Martensitic on {111} in FCC and 0001 in HCP

Deep River Localisation (7)

Deep River localisation (6)

Deep River Localisation (5)

Deep River localisation (4)

Deep River localisation (3)

Deep River Localisation (2)_Tom Sawyer

Deep River Localisation (1)

Lecture 10 April 3, 2020 Ni Alloys

Mechanical Properties of SS & Ni alloys in Nuclear Applications 2022_04_07

Lecture 1 Crystal Structure and Introduction to Diffraction Principles V5

Slide 42 Twinning in FCC Part 2

Slide 46 Slip vs Twinning in BCC

Slide 48 Twinning in HCP Part 1

Slide 48 Twinning in HCP Part 2

Slide 50 Martensite FCC HCP Part 1

Slide 50 Martensite FCC HCP Part 2

Slide 15 FCC and HCP stacking

Slide 23 Slip in FCC

Slide 25 Slip in HCP

Slide 27 Slip in BCC

Slide 41 Slip in FCC Part 1

Common symmetry element and directions between FCC twin and matrix