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Nanostructured Mg AZ31/Ti64 Multilayer Thin Films: Mechanism of Twin-Assisted Ductility and Strength

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Washington State University Pullman United States

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This project processed multilayered materials with alternating titanium and AZ31 magnesium alloy through accumulative roll bonding. The samples with 3, 5, and 7 layers were obtained. These samples were characterized microstructurally and mechanically using optical microscope, scanning electron microscopy, and debonding testing. The results show that titanium grains were heavily elongated along the rolling direction and just slightly elongated along the transverse direction AZ31 magnesium alloy layers had equiaxed grains. There are smaller grains in the center of an AZ31 magnesium alloy layer than in the region close to the interfaces. The layer interfaces were observed under scanning electron microscope and the images show that the two types of materials were bonded at the interfaces. The tests show that the interface bonding strength is at least 26.3 MPa. The strength of our samples is lower than those reported literature data for aluminumtitanium AlTi and aluminumniobium AlNb, and is higher than those reported literature data for aluminumiron AlFe and coppertitanium CuTi. It is comparable to the reported data for the samples in the literature.

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Technical Report,01 Oct 2014,30 Jun 2015



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Approved For Public Release;

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