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Thermal Exposure and Environment Effects on Tension, Fracture and Fatigue of 5XXX Alloys Tested in Different Orientations

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Technical Report,01 Jun 2014,30 Sep 2017

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Case Western Reserve University CLEVELAND United States

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The work involved a systematic study to determine the effects of changes in temper e.g.H131, H116, H128, thermal exposure conditions i.e. time, temperature, and environment e.g. dry air, humid air, solutions on the environmental cracking susceptibility at different loading rates in both the S-T and L-T orientations. Experiments were conducted using slow strain rate tension SSRT, fatigue crack growth using dcPD, and experiments conducted on fatigue precracked samples to determine the effects of changes in loading rate on cracking susceptibility. In addition, access to high resolution tomography occurred via a visit to the Harwell Diamond Light Source DLS, UK where in -situ cracking experiments were conducted as well as tomography experiments on previously tested samples. Regimes of EAC susceptibility were determined and the effects of changes in loading rate and solution on this susceptibility were determined.

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