Compositionally Graded Titanium to Aluminum Processed by Laser Powder Bed Fusion Process: P. D a r a m1, A. Singh2 and M. 1Research Center for Structural Materials, National Institute for Materials Science (NIMS). 2Research Network and Facility Services Division, National Institute for Materials Science (NIMS). 36A compositionally graded Ti-Al alloy with a designed composition range from pure Ti to pure Al could be successfully produced by a laser powder bed fusion (L-PBF) system equipped with two powder feeders. The compositionally graded Ti-Al profile is confirmed by scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), electron backscatter diffraction microscopy (EBSD) and transmission microscopy (TEM). The graded material is free of macro-horizontal crack, but micro-cracks appeared With changing Ti and Al ratio through build direction, the sample exhibits a at the center of the sample. microstructural and phase changes consisting of α+β-Ti → Al phase together with different morphology of each phase. Moreover, the effect of Ti-Ai ratio on the formation of microstructure and phase evolution lead to the different mechanical properties of each layer in the graded material. The results demonstrate that the L-PBF process is able to produce continuously compositionally graded Ti-Al material in one time. Moreover, this work has the potential to design and create a large set of compositional variants for high entropy alloy to study microstructural evolution, phase transformation, physical and mechanical properties in the future. Development of Apatite and LDH Coatings of S. Hiromoto 1,2 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) 2 Department of Materials Science, Waseda Mg alloys are expected to be used as lightweight materials for vehicles like Al alloys and as biodegradable metallic materials for bone plates and screws and so on. In both cases, the poor corrosion resistance limits their practical application. Surface modification, such as coatings, is one approach to improve the corrosion resistance. For Mg and Al alloys as lightweight materials, we are developing layered double hydroxide (LDH) coatings loaded with corrosion inhibitors as self-healing coatings. Inhibitor-loaded LDH (LDH-inh) is prepared and then coated on metal surfaces by co-electrodeposition with metal hydroxides. It has been demonstrated that the LDH-inh particles can be fixed to metal surface with metal hydroxide gel which - at the interlayer. The LDH-inh-coated Mg alloy showed higher partly transitions to LDH with NO3corrosion resistance than the alloy coated with LDH with CO3For biodegradable Mg alloys, we have been developed hydroxyapatite (HAp) and carbonate apatite (CAp) coatings since apatite is a main component of bone. HAp is stable in physiological environments, whereas CAp can be absorbed by osteoclast cells and replaced by bone. The HAp and CAp coatings showed comparable corrosion suppression ability for Mg alloys in cell culture medium, and the CAp coating showed osteoclastic resorption under culturing osteoclast cells. Then, the CAp- and HAp-coated Mg alloys are implanted in rabbit femur, and the degradation of CAp coating was shown in the area where new bone adheres. PP11--0033 Microstructure Evolution and PP11--0044 Watanabe1 Poster Presentation ｜NIMS Award Symposium 2023Mechanical Properties Mg alloys Depending on the Application P1 ｜ Process solid solution + intermetallics (Ti and Al)→University 2- at the interlayer.
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