Abstract
The interaction of hydrogen with dislocations in AA 7050 alloy heat treated to produce different matrix precipitates is studied using interrupted micro-tensile tests of pre-charged specimens and electron back scattered diffraction (EBSD). Hydrogen promoted slip planarity as well as sub-grain formation in the overaged condition having incoherent ƞ (MgZn2) precipitates, while it enhanced dislocation looping and pitting in case of higher density Mg-Zn precipitates (GP II) dominated alloy. For the first time, a semi-quantitative analysis on the extent of the effect of hydrogen on micro-mechanisms of deformation evolution is carried out using sufficient statistics through large area scans in EBSD. It is shown that the interaction of pre-charged hydrogen with the microstructure was unaffected by recrystallization as well as texture till 6% strain.
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