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DTIC ADA021431: A Comparison of the Fatigue Behavior of High Strength Cast Aluminum Alloys 201 and A357

The notched fatigue strength of high strength aluminum casting alloys A357 and 201 was evaluated using separately cast round tensile bar coupons. These results are considered satisfactory for comparison purposes of the alloys, but should not be used for design criteria. The results are plotted in the form of S/N curves. The materials are also compared by ultimately failing the surviving fatigue specimens in tension and then by comparing microstructures of the test specimens exhibiting highest and lowest ultimate tensile strengths. The notched tensile strength of 201 was higher than A357; notched strength values of 201 specimens were reduced by partial eutectic melting and undissolved eutectic in grain boundary regions.

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