Reactive AI-Li powders prepared by mechanical alloying

Document Type

Conference Proceeding

Publication Date

6-2-2006

Abstract

Mechanically alloyed powders with the composition Al 0.7Li 0.3 are synthesized. Materials milled for different times are studied using electron microscopy, x-ray diffraction, and thermal analysis. A solid solution of Li in Al (α-phase) is formed with as much as 10 at % of dissolved Li. The LiAl intermetallic δ-phase is readily produced by mechanical alloying but disappears after extended milling times. The final product of milling for 102 hours consists of an x-ray amorphous phase. Mechanically alloyed powders heated in inert environment exhibit several weak exothermic reactions between 420 and 700 K, and two endothermic reactions, around 810 and 870 K. All the observed relaxation processes become less pronounced and eventually become undetectable as the milling time increases and an amorphous material is produced. Ignition experiments performed for the powders coated on an electrically heated filament showed that the powders ignited in the vicinity of 1250 K. An experimental setup for studying combustion of reactive mechanically alloyed powders is developed and initial experimental results are described. © 2006 Materials Research Society.

Identifier

33646936665 (Scopus)

ISBN

[1558998519, 9781558998513]

Publication Title

Materials Research Society Symposium Proceedings

ISSN

02729172

First Page

39

Last Page

44

Volume

896

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