CORRELATION BETWEEN MICROSTRUCTURE AND STRESS CORROSION CRACKING SUSCEPTIBILITY OF 2091 ALLOY

摘要

The stress corrosion cracking（SCC） susceptibility of an Al-Li-Cu-Mg-Zr alloy（2091）,heat-treated under different regime,has been investigated hy means of tensile tests atslow strain rate.The microstructure has been examined with TEM.The deformationcharacteristic has also been analysed.The stress corrosion resistance of the alloy wasrevealed to be mainly affected by the covering rate of T2-phase over grain boundariesand by the average distance between T2-phase particles.SCC resistance can be obviously improved by predeforming the alloy at room temper-ature to reduce the precipitation of T2-phase along grain boundaries.