Synthesis, processing, and deformation of bulk nanophase Fe-28Al-2Cr intermetallic
- California Inst. of Technology, Pasadena, CA (United States). W.M. Keck Lab. of Engineering Materials
Nanophase Fe-28Al-2Cr powder was obtained by ball milling and consolidated by shock wave compaction. Fully-dense well-bonded compacts were produced with a diameter of 32 mm and a thickness of [approx]6 mm. The grain size in the compacts was [approx]80 nm. In tension, the nanophase intermetallic is brittle with a failure strength ([sigma][sub f] = 0.65 GPa) comparable to a coarse-grained intermetallic with similar composition. In compression, the nanophase material exhibits superplastic-like flow during room temperature quasistatic deformation to true strains greater than 1.4. The compressive flow strength is 2.1 GPa and no macroscopic strain hardening is observed. This behavior is compared to the coarse-grained material that has a yield strength of 0.25 GPa, displays significant work hardening and little tension-compression anisotropy. TEM examination of the nanophase material before and after deformation shows a refinement of the microstructure during deformation. The microstructure refines to [approx]10 nm grains surrounded by amorphous material.
- OSTI ID:
- 7278567
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:6; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
DEFORMATION
FABRICATION
MICROSTRUCTURE
CHROMIUM ALLOYS
IRON BASE ALLOYS
COMPRESSION STRENGTH
EXPERIMENTAL DATA
GRAIN REFINEMENT
GRAIN SIZE
YIELD STRENGTH
ALLOYS
DATA
INFORMATION
IRON ALLOYS
MECHANICAL PROPERTIES
NUMERICAL DATA
SIZE
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies