Figure |controlling of microstructure and performance of human implants. (IMAGE)
Caption
a, a typical human implant material application, which can be used as a bone plate to treat patients with transplant surgery. b, The distribution and morphology of α-hcp Ti and β-bcc Ti in different regions of Ti-Mo samples prepared by laser solid forming (a) P1-top; (b) P4 middle; (c) P7 bottom area; (d) phase composition statistics. The laser three-dimensional forming Ti-Mo alloy sample has an α+β dual-phase structure. The α phase content of the sample decreases from top to bottom, and the β phase of the sample gradually increases from top to bottom, showing a typical gradient structure. c, Distribution and morphology of α-hcp Ti and β-bcc Ti in different regions of the heat-treated Ti-Mo sample prepared by laser solid forming (a) P1-top; (b) P4 middle; (c) P7 bottom area; (d) phase composition statistics. The structure of the heat-treated Ti-Mo alloy sample from the top to the bottom is very uniform, and the structure is almost α mainly α. This shows that after the triple cycle heat treatment, the uniformity of the sample has been greatly improved. This transformation of the structure is due to the triple-cycle heat treatment process and the long holding time, and the non-equilibrium metastable β phase transforms into the equilibrium α phase, so that the structure from the top to the bottom of the sample tends to be thermodynamically stable. d, The compressive strain-stress curve of the sample prepared by laser three-dimensional forming after processing (a, b) and heat treatment (c, d). The heat-treated Ti-Mo alloy has higher strength and toughness than the deposited alloy. In addition, compared with the deposited samples, the heat-treated samples exhibited more uniform mechanical properties in terms of strength, ductility and fracture properties.
Credit
by Nan Kang, Kai Wu, Jin Kang, Jiacong Li, Xin Lin and Weidong Huang
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