In the investigation of the effect of stress on the kinetics of precipitation hardening processes in naturally aged SAV-1 alloy it was found that stress substantially increases the rate of precipitation processes at 110°C, particularly in the initial stage corresponding to the first section of the creep curve.
The variation of the lattice constant of the α-solid solution during aging at 110°C with and without stress indicates preferential precipitation of excess silicon during the initial stage of aging.
When the alloy is deformed at room temperature a brief removal of the load after attaining a stress above the proportional limit leads, on repeated deformation, to a yield plateau, which is due to the interaction of fields of force of dislocations with magnesium atoms.
Preliminary deformation and holding the alloy at room temperature leads to strengthening because of the pinning of dislocations by magnesium and silicon segregates, but the strengthening is less than that resulting from precipitation at 110°C.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 33–37, October, 1968.
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Sotnichenko, A.L., Yarkovoi, V.S. Strain aging processes in alloy SAV-1. Met Sci Heat Treat 10, 792–795 (1968). https://doi.org/10.1007/BF00654139
- Lattice Constant
- Aging Process