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Fig. 6. Creep curves are shown of the two alloys tested at 300C and 22 MPa.


Fig. 5 (above). TEM images show the Q precipitates and zirconium and vanadium containing precipitates in the aluminum matrix (a) and zirconium and vanadium dispersoids along the grain boundaries (b) in the 351 alloys.


Fig. 7 (right). Staircase S-N data of the 351 alloys is shown for the deck face and high pressure oil line locations.


Table 2. Comparison of the Tensile Properties Between the 351 and A356+0.5%Cu Alloys at Various Test Conditions, for Specimens Taken from Cylinder Head Deck Face Locations


Alloy


Temperature (oC)


20 351-T6


150 200 250 275 300 20


A356+0.5%CuT6


150 200 250 300


Ultimate Tensile Strength (MPa) Unconditioned 365 294 253 200 162 107 323 254


294 204 101 65 61


323 254 175 95 44


Yield Strength (MPa) Conditioned


Unconditioned 298 272 236 194 158 95


269 235


Conditioned


272 186 89 57 46


269 235 163 84 39


Elongation (%)


Unconditioned 3.5 5.0 6.8 7.0 8.5


18.9 4.8 7.6


Conditioned


5.0 8.3


18.2 37.4 42.1 4.8 7.6


10.6 16.6 44.8


July 2018 MODERN CASTING | 39


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