Abstract
Although mechanical alloying can force immiscible elements into homogeneous solid solution due to its chemically “randomizing” nature, as microstructure design of powder-processed alloys advances, other alloy configurations are also sought. Here we study ball milling of Fe–Mg alloys and obtain a heterogeneous nanostructure, with grain boundaries decorated by solute even after reaching complete supersaturation and a steady-state grain size. Such nanocrystalline powders having grain boundary segregation in the as-milled state are particularly useful for thermal stability against grain growth. The high diffusivity of Mg is thought to shift the competition between ballistic mixing and equilibration, permitting such a structure to form.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 57-61 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 180 |
| DOIs | |
| State | Published - Apr 15 2020 |
Funding
The experimental work here was supported by the US Army Research Office under Grant No. W911NF-14-1-0539, by the US National Science Foundation under Grant No. DMR-1606914, and by the Marie Skłodowska Curie Global Fellowship under Grant No. 740384. CAS acknowledges the support of the XRD and TEM work was performed at the Center for Materials Science and Engineering (CMSE), which is supported by the National Science Foundation under award No. DMR 14-19807. CMSE is part of the Massachusetts Institute of Technology. APT and FIB work was performed at the Harvard University Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure Network (NNCI), which is supported by the National Science Foundation under NSF ECCS award No. 1541959. The experimental work here was supported by the US Army Research Office under Grant No. W911NF-14-1-0539, by the US National Science Foundation under Grant No. DMR-1606914 , and by the Marie Skłodowska Curie Global Fellowship under Grant No. 740384. CAS acknowledges the support of the XRD and TEM work was performed at the Center for Materials Science and Engineering (CMSE), which is supported by the National Science Foundation under award No. DMR 14-19807 . CMSE is part of the Massachusetts Institute of Technology. APT and FIB work was performed at the Harvard University Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure Network (NNCI), which is supported by the National Science Foundation under NSF ECCS award No. 1541959 .
Keywords
- Ball mill
- Grain boundary segregation
- Iron alloys
- Mechanical alloying
- Nanocrystalline metal
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys