Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 524, Issue 1-2, Pages 143-150Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.06.032
Keywords
Aluminum; Equal-channel angular pressing; Grain boundary misorientations; Microstructure; Ultrafine grains
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- National Science Foundation of the United States [DMR-0243331]
- U.S. Army Research Office [W911NF-08-1-0201]
Ask authors/readers for more resources
High purity (99.99%) aluminum was processed by equal-channel angular pressing (ECAP) through 1-12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from I to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4-8 passes. (C) 2009 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available