The Effect Of PH2O In The Annealing Atmosphere On The Defect Structure In A Quenched Aluminium–9·87 At.% Zinc Alloy
Annealing an aluminium–9·87 at.% zinc alloy in an atmosphere containing water vapour introduces hydrogen into the alloy as the result of the surface reaction between the water vapour and the aluminium. These hydrogen atoms, by inhibiting the motion of vacancies during quenching, reduce the number of vacancies captured by the screw dislocations needed to form helical dislocations, thus reducing their attainable diameter. The partial pressure of the water vapour, PH2O, can have a strong effect on the mean diameter on the resulting helical dislocations. In addition, the calculated energy of vacancy migration in aluminium, Em, shows a strong dependence on PH2O at high values of PH2O in the annealing atmospheres. Below a certain value of PH2O, and consequently below a certain value of the hydrogen solubility, the hydrogen atoms contained in the alloy lattice have no effect on the vacancy migration energy. © 1982 Taylor & Francis Group, LLC.
H. P. Leighly, "The Effect Of PH2O In The Annealing Atmosphere On The Defect Structure In A Quenched Aluminium–9·87 At.% Zinc Alloy," Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, vol. 45, no. 5, pp. 895 - 904, Taylor and Francis Group; Taylor and Frabcis, Jan 1982.
The definitive version is available at https://doi.org/10.1080/01418618208239911
Materials Science and Engineering
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01 Jan 1982