Aging of the zinc alloy TsAM 4-1

Conclusions

• 1. Natural and artificial aging cause approximately the same linear contractions in specimens of zinc alloy TsAM 4-1. Sub-zero treatment retards the change.

• 2. 450 days' natural aging of castings causes their dimensions to decrease by 0.11–0.12%, mostly in the first month; the shrinkage is eventually complete in 45 days.

• 3. There is a 0.12–0.14% decrease in dimensions of specimens in the first six hours of aging at 80–120°C (175–250°F) with no later changes.

• 4. It is recommended that castings of this alloy, for which the tolerances are particularly close, should be naturally aged for 45 days or artificially aged for six hours at 80–100°C (175–210°F).

• 5. Oxidizing the alloy immediately after casting decreases its dimensions by 0. 03% but causes no change of dimensions in castings already aged.