Deformation behavior has been studied in a multifunctional beta titanium alloy, Gum Metal, using in-situ nanopillar-compression tests in transmission electron microscope in comparison with a conventional beta titanium alloy, beta III. In-situ observations for dislocation activity and phase transformation during compression test of solution treated samples have been performed in bright-field and diffraction modes. Distinct contrast of dislocations has not been observed during the tests in bright field mode, however subtle contrast change, which might be related to dislocation motion, has been observed in localized areas of the Gum Metal specimen. In the diffraction mode, pre-existing diffraction from omega phase decreased, and diffraction from alpha double prime phase increased with increase amount of plastic deformation. In addition, a pillar of Gum Metal with large length-to-thickness ratio showed a large amount of pseudoelastic deformation after unloading. These results have been discussed in relation to deformation mechanisms in these beta titanium alloys.

Most of air intake lip skins of jet engine nacelle on airplane are made of aluminum alloy sheet by the reason of flight function, anti-icing and bird strike durability. And some of them have a shape of non-rotational symmetry. It is impossible to form a product like that by normal spinning process. On the other hand, incremental forming enable to form non-rotational shape except vertical wall. Thereupon, one idea was proposed, i.e., the new process that combined die-less shear spinning used as pre-forming and incremental forming used as finish forming. In this case, the wall element on the pre-formed product should be shrunk in itself when it moved to the die surface set in the finish forming process. This deformation mechanism is contrary from that of conventional incremental forming. An experiment was conducted to verify the feasibility of this conception using aluminum alloy sheet 5052-O. As a result, shrinkage of the wall element on the pre-formed product was observed, and a minutiae model of air intake lip skin with a shape of non-axial symmetry was formed successfully.

Magnesium specimens were impacted by a spherical alumina projectile at a velocity around 7 km/s under two environment temperatures of room temperature (～300 K) and low temperature (～173 K). To clarify deformation and fracture mechanisms, macro- and micro-structure were inspected by using micro-X-ray computed tomography and scanning electron microscope (SEM) with electron back scattering diffraction (EBSD). In addition, simulation of the hyper-velocity impact was conducted using Smoothed Particle Hydrodynamics method to investigate the cumulative strain and temperature rise during the deformation. After a projectile impacted a target, a crater was formed on the target together with several cracks. In a closed portion below the crater formed at room temperature, fine grains and subgrains were observed by SEM/EBSD. From the calculation results, a temperature rise around 0.5 Tm (Tm; melting temperature of magnesium) and cumulated strain over 0.6 was suggested at 0.5 mm away from the edge of the crater. Therefore, the microstructure evolution was expected to be induced by the recrystallization and recovery due to the strain cumulated during the impact and the resultant temperature rise. On one hand, inspection of microstructure near the cracks revealed that microcracks were tended to propagate along grain boundary.