Embrittlement in an age-hardened 2091 aluminum alloy by exposure at elevated temperatures below the aging temperature
Journal Article
·
· Acta Materialia
Fractographic analysis after tensile tests and microstructural observation on precipitate distribution have been carried out on a 2091 alloy sheet to elucidate the cause of embrittlement which occurs in Al-Li base alloys by exposing the materials at about 70 C. Transverse tensile specimens were T8-tempered and subsequently subjected to isothermal exposure treatment at temperatures ranging from 40 to 100 C for different times up to 100 days. Reduction in the ductility was confirmed as the exposure temperature and time increased within the tested condition. This embrittlement was ascribed primarily to the reduction in the local deformability in the vicinity of grain boundaries arising from additional precipitation of fine {delta}{prime}-phase particles in the original PFZ.
- Research Organization:
- Univ. of Tokyo (JP)
- OSTI ID:
- 20002023
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 14 Vol. 47; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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