Impact Toughness Of Al-Li System Alloys At Low Temperatures

摘要: Al-2.7%Li-1.2%Cu-0.8%Mg-0.1%Zr wrought alloys are heat treated to improve their impact toughness at lower temperatures, although a number of laminated cracks form in the vertical direction fracture surface. Low melting point elements, K and Na, found on fractured surface by Auger spectroscopy. The maximum local temperature rise crack tips under dynamic loading is calculated be 90 K. modified from this equivalent metal phase having lowest for starting weakening. low probably causes liquid embrittlement grain boundaries.