Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 552, Issue -, Pages 310-315Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.05.045
Keywords
Nanostructured materials; Mechanical alloying; Grain growth
Categories
Funding
- NSF-DMR [1005677]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1005677] Funding Source: National Science Foundation
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Fe-xNi alloys from x = 0 to x = 15 with an as-milled grain size and hardness in the range of 8-11 nm and 8.5-9.5 GPa, respectively, were synthesized by ball milling. Microstructural changes, hardness, and grain growth due to annealing were characterized using X-ray diffractometry, microhardness, focused ion beam channeling contrast imaging, and optical microscopy. It was found that the composition range of single bcc phase was extended by ball milling. Subsequent annealing of MA samples resulted in reduction of hardness and extensive grain growth. It indicates that nickel has no significant effect on thermal stabilization of iron. Retained austenite was observed for Fe-8Ni and Fe-10Ni alloys annealed in the two-phase region and effect of as-milled structure on retained austenite formation was discussed. (C) 2012 Elsevier B.V. All rights reserved.
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