Recovery by triple junction motion in aluminium deformed to ultrahigh strains

by Tianbo Yu, Niels Hansen, and Xiaoxu Huang

Proceedings AVolume 467(2135):3039-3065

November 8, 2011

©2011 by The Royal Society

(a) An illustration of the rolling geometry, where RD is the rolling direction, ND is the normal direction and TD is the transverse direction.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Illustrations and examples of three types of triple junctions in lamellar structures.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

(a) A selected area in the longitudinal section of aluminium deformed to a strain of 5.5.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

(a) An illustration of a lamellar boundary structure in the longitudinal section, where the lamellar boundary (red) spacing is D, the interconnecting boundary (cyan) spacing is l (the lamella ends

are also included for this measurement), and the lamella len...

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Triple junction density in pure nickel deformed by cold rolling to various strains.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

TEM measurements of triple junction density in AA1200 (strains 2 and 4) and AA1050 (strain 5.5) aluminium.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

(a) A TEM micrograph montage of a selected area in the longitudinal section of aluminium deformed to a strain of 5.5.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Ex situ TEM observations of Y-junction motion in the longitudinal section of aluminium deformed to a strain of 5.5 and annealed at 120°C.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Ex situ TEM observations of Y-junction motion in the longitudinal section of aluminium deformed to a strain of 5.5 and annealed at 120°C.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Ex situ TEM observations of Y-junction motion in the longitudinal section of aluminium deformed to a strain of 5.5 and kept at room temperature for 6, 16 and 62 days.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Ex situ TEM observations of Y-junction motion in the longitudinal section of aluminium deformed to a strain of 5.5 and annealed at 220°C.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

(a) A selected area in the longitudinal section of aluminium deformed to a strain of 5.5 and annealed at 120°C for 10 h.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Dependence of the dihedral angle on the lamella spacing of Y-junctions in aluminium deformed to a strain of 5.5.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Examples of Y-junction motion in the longitudinal section (ND–RD plane) of aluminium deformed to strains (a) 2, (b) 4 and (c) 5.5 and annealed at 120°C for 5 h.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

(a) Evolution of the lamellar boundary spacing (both in the sample interior and at the surface) and the Y-junction density during isothermal annealing at 220°C for AA1050 aluminium deformed

to a strain of 5.5.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Normalized grain boundary surface tension as a function of the dihedral angle at a Y-junction.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

A sketch illustrating structural coarsening via Y-junction motion.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society

Evolution of the skewness of the lamellar boundary spacing distribution in the strain 5.5 aluminium during isothermal annealing at 220°C.

Tianbo Yu et al. Proc. R. Soc. A 2011;467:3039-3065

©2011 by The Royal Society