Abstract
POLMEAR and co-workers1–3 have shown that small additions of silver to Al-Zn-Mg alloys can bring about increases in strength, and, by retarding over-ageing, allow alloys to be aged at higher temperatures. When silver was added to ‘DTD 683’ (ref. 3) the increase in hardness at ageing temperatures up to 135° C was small, the main advantage being that high hardness levels were maintained when ageing at temperatures up to 180° C.
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References
Polmear, I. J., J. Inst. Metals, 89, 51 (1960).
Vietz, J. T., Sargant, K. R., and Polmear, I. J., J. Inst. Metals, 92, 327 (1964).
Polmear, I. J., Nature, 186, 303 (1960).
Taylor, I., Metal Progress, 84, 96 (1963).
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KENT, K. Effects of Silver and Two-step Ageing Treatments on a Weldable Alloy of Aluminium, Zinc and Magnesium. Nature 207, 182–183 (1965). https://doi.org/10.1038/207182b0
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DOI: https://doi.org/10.1038/207182b0
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