Impact initiated combustion of aluminum exposed to mechanical pre-activation

18th APS-SCCM; 24th AIRAPT

Breidenich, J.L.^1 ; Turner, J.^1 ; Kennedy, G.^1 ; Thadhani, N.N.^1

Material Science and Engineering, Georgia Institute of Technology, Atlanta

GA

30332, United States^1

关键词: Combustion reactions;    High speed imaging;    High-energy ball milling;    Impact experiment;    Impact initiation;    Minimum velocities;    Reaction initiation;    Threshold velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/18/182006/pdf
DOI  :  10.1088/1742-6596/500/18/182006

来源: IOP

【 摘 要 】

The impact initiation of as-received and mechanically activated aluminum powder compacts is investigated through uniaxial stress rod-on-anvil impact experiments. The compacts reveal light emission due to combustion reaction at velocities greater than 165 m/s. Mechanical pre-activation, such as that achieved via high-energy ball milling (HEBM) or high strain machining, strain hardens the starting materials, affecting their combustion initiation behavior. The starting materials are characterized by their lattice strain, size, and surface area to volume ratio. High speed imaging reveals that the threshold velocity (minimum velocity necessary for reaction initiation) changes as a function of the mechanical pre-activation.