Effect of precipitates on hydrogen transport and hydrogen embrittlement of aluminum alloys

Lunarska, E.; Chernyaeva, O.
May 2004
Materials Science;May2004, Vol. 40 Issue 3, p399
Academic Journal
It is shown that aluminum, Al-Mg-Mn-Fe (Alustar), Al-Mg-Mn-Fe-Si-Cr (PA13), and Al-Zn-Mg-Mn-Fe-Si-Cr (Pa47) alloys are sensitive to hydrogen embrittlement in the course of the tests carried out at low strain rates in a 0.01 N NaOH solution. The stress-strain curves, time to failure, and the character of fracture surfaces of specimens tested in air and under the conditions of cathodic polarization are compared. The parameters of hydrogen transport and its entrapping by hydrogen traps are studied on the basis of the data of electrochemical measurements of hydrogen permeation and vacuum extraction. The morphology of inclusions is estimated by the method of numerical metallography and their chemical composition by the method of EDS analysis. Despite distinctions in the chemical and phase compositions of alloys, we observe the dependence of the sensitivity to hydrogen embrittlement on the parameters of hydrogen transport and its entrapping by irreversible traps and some other microstructural characteristics. Under the conditions of electrolytic hydrogenation, the PA13 alloy reveals hydrogen-enhanced plasticity.


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