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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References
ASM Met. Handb. 3, 848 (1991).
R. Eborall and C. E. Ransley, J. Inst. Met. 71, 525 (1945).
P. E. Blackburn and E. A. Gulbransen, J. Electrochem. Soc. 107, 944 (1960).
R. A. Hine and R. D. Guminski, J. Inst. Met. 89, 417 (1960–61).
R. J. Breakspere, J. Appl. Chem. 20, 208 (1970).
P. T. Stroup, Symposium on Controlled Atmospheres (American Society for Metals, 1942), p. 207.
S. A. Levy and R. S. Mapes, Proc. 2nd Intern. Congr. Hydrogen Metals, Paris, Paper 6B4 (1977).
J. E. Draley and W. E. Ruther, J. Electrochem. Soc. 104, 329 (1957).
W. Eichenauer and A. Pebbler, Z. Met. 48, 373 (1957).
M. S. Hunter and P. Fowle, J. Electrochem. Soc. 103, 482 (1956).
S. Takasuma and S. Tsuchida, Sumitomo Light Metal Tech. Rept. 37, 120 (1996).
D. L. Belitskus, Oxid. Met. 8, 303 (1974).
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Dorward, R.C. Strain-Activated Hydrogen Absorption during Heat Treatment of Al–Zn–Mg–Cu Alloy AA7475. Oxidation of Metals 55, 69–74 (2001). https://doi.org/10.1023/A:1010373125051
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DOI: https://doi.org/10.1023/A:1010373125051