Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum

T. R. McNelly, D. L. Swisher, Z. Horita, T. G. Langdon

Research output: Contribution to conferencePaper

2 Citations (Scopus)

Abstract

High-purity (99.99%) aluminum that had been subjected to equal-channel angular pressing (ECAP) was analyzed by orientation imaging microscopy (OIM). The analysis of microtexture and microstructure by OIM will be reviewed. The ECAP pressing was conducted at room temperature with a die that had a 90° angle between the die channels and repetitive pressings followed either route A, BC or C. Billets were examined after one pass and after four or twelve passes by each of the ECAP routes. After one pressing operation, the deformation-induced microstructure was inhomogeneous at the resolution of OIM and consisted mostly of subgrains. Following four pressings by each of the routes, the microstructures were homogeneous and exhibited similar (sub)grain sizes (∼1.3 μm). Elongation and alignment of the (sub)grains with the shearing direction of the last pressing operation was observed in all cases. The corresponding disorientation distributions showed significant increases in the fractions of high-angle boundaries (θ>15°) although processing route had little apparent effect on the observed distributions. However, distinct differences were noted in the microtexture data. After 12 pressing operations by any of the different routes the grain size was reduced further to about 1.0μm. The fraction of high-angle boundaries also increased slightly but, again, processing route had little effect on the disorientation distribution. Different textures were apparent for each processing route, although texture data for all routes indicated that a <111> tended to align with the shear plane of the final pressing pass.

Original languageEnglish
Pages15-24
Number of pages10
Publication statusPublished - Jan 1 2002
EventUltrafine Grained Materials II - Seattle, WA, United States
Duration: Feb 17 2002Feb 21 2002

Other

OtherUltrafine Grained Materials II
CountryUnited States
CitySeattle, WA
Period2/17/022/21/02

Fingerprint

Equal channel angular pressing
pressing
Aluminum
Microscopic examination
Grain boundaries
grain boundaries
routes
aluminum
Imaging techniques
microstructure
Microstructure
Processing
Textures
Shearing
Elongation
disorientation
microscopy
textures
grain size
billets

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

McNelly, T. R., Swisher, D. L., Horita, Z., & Langdon, T. G. (2002). Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum. 15-24. Paper presented at Ultrafine Grained Materials II, Seattle, WA, United States.

Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum. / McNelly, T. R.; Swisher, D. L.; Horita, Z.; Langdon, T. G.

2002. 15-24 Paper presented at Ultrafine Grained Materials II, Seattle, WA, United States.

Research output: Contribution to conferencePaper

McNelly, TR, Swisher, DL, Horita, Z & Langdon, TG 2002, 'Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum', Paper presented at Ultrafine Grained Materials II, Seattle, WA, United States, 2/17/02 - 2/21/02 pp. 15-24.
McNelly TR, Swisher DL, Horita Z, Langdon TG. Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum. 2002. Paper presented at Ultrafine Grained Materials II, Seattle, WA, United States.
McNelly, T. R. ; Swisher, D. L. ; Horita, Z. ; Langdon, T. G. / Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum. Paper presented at Ultrafine Grained Materials II, Seattle, WA, United States.10 p.
@conference{c08a85271389405ab4629ff634d575f8,
title = "Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum",
abstract = "High-purity (99.99{\%}) aluminum that had been subjected to equal-channel angular pressing (ECAP) was analyzed by orientation imaging microscopy (OIM). The analysis of microtexture and microstructure by OIM will be reviewed. The ECAP pressing was conducted at room temperature with a die that had a 90° angle between the die channels and repetitive pressings followed either route A, BC or C. Billets were examined after one pass and after four or twelve passes by each of the ECAP routes. After one pressing operation, the deformation-induced microstructure was inhomogeneous at the resolution of OIM and consisted mostly of subgrains. Following four pressings by each of the routes, the microstructures were homogeneous and exhibited similar (sub)grain sizes (∼1.3 μm). Elongation and alignment of the (sub)grains with the shearing direction of the last pressing operation was observed in all cases. The corresponding disorientation distributions showed significant increases in the fractions of high-angle boundaries (θ>15°) although processing route had little apparent effect on the observed distributions. However, distinct differences were noted in the microtexture data. After 12 pressing operations by any of the different routes the grain size was reduced further to about 1.0μm. The fraction of high-angle boundaries also increased slightly but, again, processing route had little effect on the disorientation distribution. Different textures were apparent for each processing route, although texture data for all routes indicated that a <111> tended to align with the shear plane of the final pressing pass.",
author = "McNelly, {T. R.} and Swisher, {D. L.} and Z. Horita and Langdon, {T. G.}",
year = "2002",
month = "1",
day = "1",
language = "English",
pages = "15--24",
note = "Ultrafine Grained Materials II ; Conference date: 17-02-2002 Through 21-02-2002",

}

TY - CONF

T1 - Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum

AU - McNelly, T. R.

AU - Swisher, D. L.

AU - Horita, Z.

AU - Langdon, T. G.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - High-purity (99.99%) aluminum that had been subjected to equal-channel angular pressing (ECAP) was analyzed by orientation imaging microscopy (OIM). The analysis of microtexture and microstructure by OIM will be reviewed. The ECAP pressing was conducted at room temperature with a die that had a 90° angle between the die channels and repetitive pressings followed either route A, BC or C. Billets were examined after one pass and after four or twelve passes by each of the ECAP routes. After one pressing operation, the deformation-induced microstructure was inhomogeneous at the resolution of OIM and consisted mostly of subgrains. Following four pressings by each of the routes, the microstructures were homogeneous and exhibited similar (sub)grain sizes (∼1.3 μm). Elongation and alignment of the (sub)grains with the shearing direction of the last pressing operation was observed in all cases. The corresponding disorientation distributions showed significant increases in the fractions of high-angle boundaries (θ>15°) although processing route had little apparent effect on the observed distributions. However, distinct differences were noted in the microtexture data. After 12 pressing operations by any of the different routes the grain size was reduced further to about 1.0μm. The fraction of high-angle boundaries also increased slightly but, again, processing route had little effect on the disorientation distribution. Different textures were apparent for each processing route, although texture data for all routes indicated that a <111> tended to align with the shear plane of the final pressing pass.

AB - High-purity (99.99%) aluminum that had been subjected to equal-channel angular pressing (ECAP) was analyzed by orientation imaging microscopy (OIM). The analysis of microtexture and microstructure by OIM will be reviewed. The ECAP pressing was conducted at room temperature with a die that had a 90° angle between the die channels and repetitive pressings followed either route A, BC or C. Billets were examined after one pass and after four or twelve passes by each of the ECAP routes. After one pressing operation, the deformation-induced microstructure was inhomogeneous at the resolution of OIM and consisted mostly of subgrains. Following four pressings by each of the routes, the microstructures were homogeneous and exhibited similar (sub)grain sizes (∼1.3 μm). Elongation and alignment of the (sub)grains with the shearing direction of the last pressing operation was observed in all cases. The corresponding disorientation distributions showed significant increases in the fractions of high-angle boundaries (θ>15°) although processing route had little apparent effect on the observed distributions. However, distinct differences were noted in the microtexture data. After 12 pressing operations by any of the different routes the grain size was reduced further to about 1.0μm. The fraction of high-angle boundaries also increased slightly but, again, processing route had little effect on the disorientation distribution. Different textures were apparent for each processing route, although texture data for all routes indicated that a <111> tended to align with the shear plane of the final pressing pass.

UR - http://www.scopus.com/inward/record.url?scp=0036443457&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036443457&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:0036443457

SP - 15

EP - 24

ER -