Precipitation in Rapidly Solidified Al-Mn Alloys
Abstract
Precipitation at 450 C was studied in melt-spun ribbons containing up to 15 wt.% Mn in solid solution in Al. The as-spun ribbons were microsegregation-free at compositions up to 5 wt.% Mn, but in more concentrated alloys a cellular micro-structure was present. Upon annealing, four precipitate phases are observed, some of them being found preferentially on cell boundaries and others within the cells. Al6Mn, G and the G phase can coexist for long times at 450 C, but the G phase appears to be slightly more stable. A less stable T phase was detected in Al-5 wt.% Mn foils following short annealing periods. The supersaturation of the Al matrix can persist for many hours in alloys containing up to 3 wt.% Mn, but is essentially gone after 1 hour in alloys with 5 wt.% Mn or more.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1983
- Accession Number
- ADA136128
Entities
People
- D. Shechtman
- E. Horowitz
Organizations
- Johns Hopkins University