Nano-subgrain Strengthening in Ball-milled Iron
Journal Article
·
· Materials Science and Engineering A, vol. 463, N/A, August 15, 2007, pp. 54-60
OSTI ID:936489
The strength and deformation behavior of ball-milled, iron-base materials containing nano-scale subgrains have been evaluated. As reported by several authors, nanosubgrains form during the early stages of ball milling as a result of severe plastic deformation inherent in the ball milling process. The strength for these nano-scale subgrains are compared with the strength of larger-scale subgrains in iron and iron-base alloys produced by traditional mechanical working. The data covers over 2 orders of magnitude in subgrain size (from 30 nm to 6 {micro}m) and shows a continuous pattern of behavior. For all materials studied, the strength varied as {lambda}{sup -1}, where {lambda} is the subgrain size. Strengthening from subgrains was found to breakdown at a much smaller subgrain size than strengthening from grains. In addition, the ball-milled materials showed significant strengthening contributions from nano-scale oxide particles. Shear bands are developed during testing of ball-milled materials containing ultra-fine subgrains. A model for shear band development in nano-scale subgrains during deformation has also been developed. The model predicts a strain state of uniaxial compression in the shear band with a strain of -1.24. Subgrains are shown to offer the opportunity for high strength and good work hardening with the absence of yield point behavior.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 936489
- Report Number(s):
- UCRL-JRNL-220174
- Journal Information:
- Materials Science and Engineering A, vol. 463, N/A, August 15, 2007, pp. 54-60, Journal Name: Materials Science and Engineering A, vol. 463, N/A, August 15, 2007, pp. 54-60 Vol. 463
- Country of Publication:
- United States
- Language:
- English
Similar Records
Deformation structures in ball milled copper
Subgrain refinement strengthening. Annual report, October 1, 1974--September 30, 1975
MICROSTRUCTURE IN ADIABATIC SHEAR BANDS IN A PEARLITIC ULTRAHIGH CARBON STEEL
Journal Article
·
Thu Feb 29 23:00:00 EST 1996
· Acta Materialia
·
OSTI ID:215408
Subgrain refinement strengthening. Annual report, October 1, 1974--September 30, 1975
Technical Report
·
Wed Dec 31 23:00:00 EST 1975
·
OSTI ID:7338024
MICROSTRUCTURE IN ADIABATIC SHEAR BANDS IN A PEARLITIC ULTRAHIGH CARBON STEEL
Journal Article
·
Mon Sep 22 00:00:00 EDT 2003
· Materials Science and Technology, vol. 21, no. 3, March 1, 2005, pp. 317-324
·
OSTI ID:891730