EFFECT OF HEAT TREATMENT AND STRAINING RATE ON FRACTURE AND CORROSION OF Zn-22 Al SUPERPLASTIC ALLOY.

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Ismail, Mohamed I.
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Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques | 1979年 / 70卷 / 05期
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The effect of heat treatment (annealing at 250 to 400 degree C for 1 h, followed by water quenching) and the rate of straining (4. 2 multiplied by 10** minus **4 minus 4. 1 multiplied by 10** minus **1s** minus **1) at 18 degree C on mechanical properties and corrosion of Zn-22Al in sulfuric acid were studied. The results obtained showed that there is a critical rate of straining at which the specimen fracture occurs at lower tensile strain levels although the ultimate tensile strength increases with increasing straining rate. The hardness of heat-treated specimens increased with the heat treatment temperature. The corrosion of heat-treated specimens in sulfuric acid demonstrated that there is a critical heat treatment temperature (about 330 degree C) which results in minimum corrosion. The corrosion rate in sulfuric acid increases at a higher rate in the concentration range of 0. 1-1 N sulfuric acid.
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页码:337 / 340
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