The objective of this study is to investigate dynamic torsional characteristics of Al-Li alloys using torsional Kolsky bar. The materials used were a 2090 (Al-2.9Cu-2.2Li-0.15Mg-0.13Zr wt%) and an 8090 (Al-2.5Li-1.24Cu-0.9Mg-0.11Zr wt%) Al-Li alloy. Dynamic (gamma rate = 1200/s) torsional tests were conducted at room temperature and low temperature (-196 deg C), and the deformed regions and the fracture surfaces of the tested specimens were examined. A number of planar slip bands were formed predominantly in the heavily deformed region in the case of room temperature dynamic testing, but the amount of planar slip bands tended to decrease with decreasing test temperature. This indicated that the overall deformation mode of both Al-Li alloys changed from the planar slip to the homogeneous deformation with decreasing temperature, resulting in the improvement of the cryogenic properties under dynamic torsional loading.
Study of dynamic torsional characteristics of Al-Li alloys
Untersuchung von dynamischen Torsionseigenschaften von Al-Li-Legierungen
Titel koreanisch
Journal of the Korean Institute of Metals and Materials ; 34 , 7 ; 813-821
1996
9 Seiten, 12 Bilder, 2 Tabellen, 29 Quellen
Article (Journal)
Korean
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