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It is the objective of this book to describe the potential usefulness of parametric analyses in analyzing and extrapolating the properties of aluminum alloys at high temperatures. It is also the intent to illustrate the use of such methods by presenting a broad spectrum of high-temperature creep data for aluminum alloys generated from a single source and developed using consistent testing procedures and practices.
The application of time-temperature parameters to stress-strain rupture, and creep data for metals and alloys is reviewed. Some comparisons are made of theoretical and experimental parameters. A parameter based upon rate-process theory was successfully applied to rupture and creep data for aluminum and various aluminum alloys. The value of the constant in the parameter, which provided the best correlation of the data, was determined for each material and application. Master curves of stress against the parameter which summarize extensive data on the aluminum alloys are presented for rupture, minimum creep rate, and time to 1 percent strain. Predictions of long-time life from short-time data are shown to be possible.
Tensile properties that may be obtained in highstrength alloys for use from -423 to 4000 F are presented. Representative properties are given for high-strength alloys of the common base metals having melting points from that of Mg to that of W. The primary purpose is to illustrate the upper limits of the yield strength to density ratios for these alloys within the range of possible service temperatures. The temperature and time effects are combined in the LarsonMiller parameter for 0.2% offset yield strength or 0.2% plastic creep strain for limited creep data. The time for 0.2% offset yield strength determination is assumed as 0.01 hr. This permits use of yield-strength data from tensile tests and 0.2% plastic-creep-strain data from creep tests in the same charts. The LarsonMiller parameter may not be strictly applicable for certain alloys. In some instances, the data are for current production alloys with standard heat treatments. (Author).