Abstract
Subsurface porosity due to hydrogen absorption (commonly known as high-temperature oxidation, or “HTO”) in an Al–5.5% Zn–2.25% Mg–1.5% Cu alloy during heat treatment in undried air at 515°C is accentuated by prior strain. Under the uncontrolled atmospheric conditions used, the critical strain level for the onset of “HTO” is about 1.5%; increasing strain results in more porosity and surface blistering. If NaBF4 is added to the furnace atmosphere, no porosity is evident at strain levels up to 5%.
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