Unconfined twist : a simple method to prepare ultrafine grained metallic materials.
- Yonghao
- Yuntian Theodore
A new simple method - unconfined twist was employed to prepare ultrafine grained (UFG) Fe,wire. A coarse grained (CG) Fe wire with a diameter of 0.85 mm was fixed at one end, and twisted at the other end. After maximum twist before fracture, in the cross-sectional plane, concentrically deformed layers with a width of several micrometers formed surrounding the center axis of the wire. The near-surface deformed layers consist of lamella grains with a width in submicrometer range. In the longitudinal plane, deformed bands (with a width of several micrometers) formed uniformly, which were composed of lamella crystallites (with a width in submicrometer range). The tensile yield strength and ultimate strength of the twisted Fe wire are increased by about 150% and 100% compared with the values of its CG counterpart.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 977551
- Report Number(s):
- LA-UR-04-2557; TRN: US201009%%837
- Resource Relation:
- Journal Volume: 821; Conference: Submitted to: 2004 Spring MRS conference proceeding, April 2004, San Francisco
- Country of Publication:
- United States
- Language:
- English
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