Abstract
Variation in the scanning strategy for β-type Ti alloys during additive manufacturing (AM) enables the fabrication of a singlecrystal-like microstructure possessing a crystallographic texture, in which the low-Young’s modulus-<100> direction is aligned along a specific direction. Thus, metal biomaterial with low elasticity, comparable to the bone Young’s modulus, can be developed by AM, which will contribute to suppress the stress shielding of bone and prevent degradation of bone tissue anisotropy.
Highlights
Bone is composed primarily of collagen fibers and apatite crystals that exhibit three-dimensional preferential orientation as a bone quality parameter depending on the anatomical bone position [15]; the design of a bone substitute should be developed based on the anisotropic bone microstructure [16]
A unique and useful crystallographic texture can be obtained depending on the scan strategies, for the suppression of stress shielding in bone utilizing the bone implants fabricated by metal additive manufacturing (AM)
Metal AM exhibiting the capacities for both shape and microstructural control is expected to contribute primarily to the creation of products with sophisticated functions
Summary
The texture evolution in β-type Ti alloy components during fabrication was investigated by selective laser melting (SLM), a type of powder bed fusion process. By Scan Strategy_X, the fabricated specimen exhibited a low Young’s modulus of approximately 69 GPa in the -oriented direction. A significant anisotropy in the elastic properties was achieved only in the products fabricated by Scan Strategy_X derived from the evolution of different textures; and preferentially oriented along the x and y directions, respectively, in the sample fabricated by Scan Strategy_X, while oriented along both x and y directions in the sample fabricated by Scan Strategy_XY This demonstrates the effectiveness of the well-organized SLM process for providing Young's moduli in the products. The formation of more prominent single crystalline-like textures and an optimum composition control considering the evaporation of light elements will render the low Young’s modulus compatible to bones
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