Abstract
Aluminum alloys have recently been used as cryogenic structural materials. The purpose of the present paper is to study tensile properties and behavior at impact test of T-4 treated Al-Zn-Mg, annealed Al-Mg and T-6 treated Al-Mg-Si alloys between room temperature and -196°C.Although no distinct reduction of ductility was observed in tensile test at low temperatures, instrumented Charpy impact test of Al-Zn-Mg and Al-Mg alloys showed a reduction of notch toughness at -196°C: Toughness was good in the following order; Al-Mg alloy> Al-Zn-Mg alloy> Al-Mg-Si alloy.Low temperature embrittlement of Al-Zn-Mg alloy was due to a decrease of crack-propagation energy. Crack-initiation and crack-propagotion energies were reduced in Al-Mg alloy. Low temperature fracture surfaces of these alloys showed laminated fracture facets. These facets were probably introduced by low temperature brittle fracture of precipitates at extremely elongated grain boundaries.It was found that the unstable rapid fracture occurred in press boundary notch specimens of Al-Zn-Mg and Al-Mg-Si alloys. The fracture toughness value for these alloys was estimated to be about 1 kg-mm/mm2.
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