Coating method to suppress porosity in Al-Li alloys

Details Coating method to suppress porosity in Al-Li alloys Coating method to suppress porosity in Al-Li alloys

1990-07-05

1991-10-29

Dean, R.

Metal treatment

Compositions

Heat treating

148 115A, 148240, C22F 104

Patent

active

050613286

ABSTRACT:
An element having a diffusion coefficient at a heat treatment temperature which is greater to or equal than that of lithium is deposited on the external surface of an Al-Li alloy part before heat treatment. During heat treatment the diffusion of lithium atoms out of the alloy material is compensated by the opposite diffusion of the deposited element. Thus, the creation of agglomerated vacancies in the nature of interior pores is eliminated so that a treated part may maintain its structural strength. Typical diffusion materials may be selected from Ag, Au, Zn, Ge, In, Sn, and Tl.

REFERENCES:
patent: 4786337 (1988-11-01), Martin

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