Effects of laser surface melting on crystallographic texture, microstructure, elastic modulus and hardness of Ti−30Nb−4Sn alloy
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Transactions of Nonferrous Metals Society of China
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Resumo
The biocompatibility of orthopedic implants is closely related to their elastic modulus and surface properties.
The objective of this study was to determine the effects of cold rolling, recrystallization and laser surface melting
(LSM) on the microstructure and mechanical properties of a biphase (α″+β) Ti−30Nb−4Sn alloy. X-ray diffraction
(XRD) texture analysis of the cold-rolled substrate revealed the [302]α″//ND texture component, while analysis of the
recrystallized substrate showed the [302]α″//ND and [110]α″//ND components. The β-phase texture could not be directly
measured by XRD, but the presence of the [111]β//ND texture component was successfully predicted by considering the
orientation relationship between the α″ and β phases. Nanoindentation measurements showed that the elastic modulus of
the cold-rolled substrate (63 GPa) was lower than that of the recrystallized substrate (74 GPa). Based on the available
literature and the results presented here, it is suggested that this difference is caused by the introduction of crystal
defects during cold deformation. The combined nanoindentation/EBSD analysis showed that the nanoindentation results
are not affected by crystal orientation. LSM of the deformed alloy produced changes in hardness, elastic modulus and
crystallographic texture similar to those produced by recrystallization heat treatment, creating a stiffness gradient
between surface and substrate.
Como referenciar
FANTON, LEONARDO; LIMA, NELSON B. de; ENCINAS, EMILIO R.; BORRÁS, VICENTE A.; AFONSO, CONRADO R.M.; FOGAGNOLO, JOÃO B. Effects of laser surface melting on crystallographic texture, microstructure, elastic modulus and hardness of Ti−30Nb−4Sn alloy. Transactions of Nonferrous Metals Society of China, v. 30, n. 2, p. 392-404, 2020. DOI: 10.1016/S1003-6326(20)65221-9. Disponível em: http://repositorio.ipen.br/handle/123456789/31451. Acesso em: 30 Dec 2025.
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