Abstract
The present study was carried out in order to understand acoustic emission characteristics of new aluminum alloys for aircraft applications. These alloys contain lithium and have high stiffness and strength at lower density. Tensile samples along the extrusion direction were solution heat-treated and aged at 24 and 176 degree C with or without stretching immediately after solution treatment. In all cases, AE signal intensity reached a maximum before yielding and increased with strength level. In work-hardening region, dynamic strain aging was observed, reflecting the presence of mobile solute atoms. Correlation of strength, ductility and AE behavior is reported. Possible mechanisms of unusual AE-strength relation are discussed in terms of precipitating phases present.
Original language | English |
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Pages | 111-115 |
Number of pages | 5 |
State | Published - 1985 |