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At room temperature the fatigue strength of high-purity aluminum approaches a lower limiting value in accord with the usual observations on nonferrous metals. But at 250 C its fatigue strength continues to decrease abruptly with increasing cycles of stress without exhibiting any trend toward reaching a limiting value even at 107 cycles. Whereas finer grain-sized specimens exhibit higher fatigue strengths at room temperature, grain size has no effect on the fatigue strength at 250 C. Such insensitivity of the fatigue strength to grain size is undoubtedly due to the fact that both grain sizes yield identical structures consisting of extensively disoriented polygonized subgrains which completely obliterate the original grain size following brief cycling at a given stress at 250 C.
A compilation of data collected and maintained for many years as the property of a large aluminum company, which decided in 1997 to make it available to other engineers and materials specialists. In tabular form, presents data on the tensile and creep properties of eight species of wrought alloys and five species of cast alloys in the various shapes used in applications. Then looks at the fatigue data for several alloys under a range of conditions and loads. The data represent the typical or average findings, and though some were developed years ago, the collection is the largest and most detailed available. There is no index.