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11_13

Materials Science and Engineering: An Introduction

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256 Temperature (∞C) Time Range (h) 260 <0.01, >100 204 <0.15 149 <10 121 <400 From these tabulations, the following may be concluded: It is not possible to heat treat this alloy at 260∞C so as to produce the desired set of properties--there is no overlap of the two sets of time ranges. At 204∞C, the heat treating time would be between 0.02 and 0.15 h; times lying within this range are impractically short. At 149∞C, the time would be 10 h. Finally, at 121∞C, the time range is 35 to about 400 h. 11.D10 This problem inquires as to the possibility of producing a precipitation-hardened 2014 aluminum alloy having a minimum tensile strength of 425 MPa (61,625 psi) and a ductility
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Unformatted text preview: of at least 12%EL. In order to solve this problem it is necessary to consult Figures 11.16(a) and (b). Below are tabulated the times required at the various temperatures to achieve the stipulated tensile strength. Temperature (∞C) Time Range (h) 260 <0.5 204 <15 149 1-1000 121 >35-? With regard to temperatures and times to give the desired ductility: Temperature (∞C) Time Range (h) 260 <0.02, >10 204 <0.4, >350 149 <20 121 <1000 From these tabulations, the following may be concluded:...
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