A mathematical model to predict the strength of aluminum alloys subjected to precipitation hardening |
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Authors: | F S Qureshi A K Sheikh M Rashid |
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Affiliation: | (1) The Lubrizol Corporation, 29400 Lakeland Blvd., 44092-2298 Wickliffe, OH, USA;(2) Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, 31261 Dhahran, Saudi Arabia |
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Abstract: | A number of alloys, notably most of the aluminum alloys, can be heat treated by aging. This aging due to time-dependent precipitation
hardening increases the strength and hardness as well as modifying other mechanical properties. Precipitation hardening has
been a popular strengthening mechanism for many decades; therefore, extensive information is available in literature about
the precipitation-hardening response of various series of aluminum alloys. The age-har dening response of these alloys is
usually represented in graphical form as plotted between property changes and aging time for different temperatures. In designing
a suitable precipitation-hardening strategy, one can refer to these graphs. However, for automatic control of aging furnaces,
as well as for decision making regarding optimal selection of aging conditions (time/temperature combination), it is desirable
to express these relationships in a formal mathematical structure. A mathematical model is developed in this article for widely
used heat treatable aluminum alloys used in the extrusion industry. This model is a condensed representation of all σ=f(T, t) curves in different series of aluminum alloys, and the parameters of this model characterize the various compositions of
the alloys in the series. |
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Keywords: | age hardening aging aluminum aluminum alloys aluminum extrusions cooling rate extrudable alloys precipitation hardening regression strength |
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