TY - GEN
T1 - Reactive AI-Li powders prepared by mechanical alloying
AU - Zhu, Xiaoying
AU - Schoenitz, Mirko
AU - Hoffmann, Vern K.
AU - Dreizin, Edward L.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:33646936665
SN - 1558998519
SN - 9781558998513
T3 - Materials Research Society Symposium Proceedings
SP - 39
EP - 44
BT - Multifunctional Energetic Materials
T2 - 2005 Materials Research Society Fall Meeting
Y2 - 28 November 2005 through 1 December 2005
ER -