Thermal expansion and lattice parameters of shaped metal deposited Ti–6Al–4V

Swarnakar, Akhilesh Kumar; Biest, Omer Van der; Baufeld, Bernd

doi:10.1016/j.jallcom.2010.12.014

Cited by 55 publications

(29 citation statements)

References 26 publications

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“…The main chemical compositions of trabecular bone and scaffold were hydroxyapatite and titanium alloy (Ti6Al4V), respectively. The linear thermal expansion coefficient of hydroxyapatite and titanium alloy were 1.15 × 10 −5 /°C [ 23 ] and 1.17 × 10 −5 /°C [ 24 ], respectively. The radius of titanium alloy scaffold was 2.5 mm.…”

Section: Methodsmentioning

confidence: 99%

Examining trabecular morphology and chemical composition of peri-scaffold osseointegrated bone

Lyu

Yang

et al. 2020

J Orthop Surg Res

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Background Porous titanium alloy scaffold fabricated by 3D printing technology could induce osseointegration well to repair bone defect during early postoperative period. However, trabecular histomorphological features and chemical compositions of ingrowth bone in the long term after surgery still lacked in-depth research. Methods Fourteen New Zealand rabbits were divided into two groups (7 rabbits in surgery group and 7 rabbits in control group). A 3D-printed porous titanium alloy scaffold was implanted into right femoral condyle of each rabbit in the surgery group. Preload was produced at the surface between bone tissue and scaffold through interference assembly during implantation process. Rabbits in the control group were feed free. All rabbits were sacrificed to extract femoral condyles at week 12 after surgery. All right femoral condyles were performed micro-CT scanning to test bone mineral density (BMD) and trabecular histomorphological parameters, including bone volume fraction (BV/TV), bone surface/volume ratio (BS/BV), bone surface density (BS/TV), structure model index (SMI), trabecular thickness (Tb.Th), trabecular number (Tb.N), trabecular separation (Tb.Sp), porosity (PO), connectivity density (Conn.Dn), and degree of anisotropy (DA). Scanning electron microscope was used to observe osteogenesis peri-scaffold. Fourier transform infrared spectroscopy (FTIR) scanning was performed to analyze chemical compositions of peri-scaffold trabeculae. All trabecular morphological parameters and BMDs were statistically analyzed between surgery group and control group. Results The pores of scaffold were filled with ingrowth bone tissues after 12 weeks osseointegration. However, the mean BMD peri-scaffold in surgery group was 800 ± 20 mg/cm3, which was 18.37% lower than that in the control group. There was a significant decrease in BV/TV, Tb.N, and BS/TV, and there was a significant increase in Tb.Sp and PO between the surgery group and control group (p < 0.05). There were no significant differences in Tb.Th, SMI, Conn.Dn, BS/BV, and DA. Although ingrowth of bone tissue was very effective, some fragmented connective tissues were still found instead of bone tissues on the partial beams of scaffolds through SEM images. It was found from FTIR that there was no significant hydroxyapatite peak signal in surgery group. Collagen in the control group mainly existed as cross-link structure, while non-cross-link structure in the surgery group. Conclusions Preload could promote the same good osseointegration ability as chemical surface modification method in the early term after surgery, and better osseointegration effect than chemical surface modification method in the mid-long term after surgery. However, histomorphological features of peri-scaffold trabeculae were still in deterioration and low collagen maturity caused by stress shielding. It was suggested from this study that extra physical training should be taken to stimulate the bone remodeling process for recovering to a healthy level.

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Section: Methodsmentioning

confidence: 99%

Examining trabecular morphology and chemical composition of peri-scaffold osseointegrated bone

Lyu

Yang

et al. 2020

J Orthop Surg Res

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“…The coefficient of thermal expansion (CTE) values for Ti-6Al-4V are a weighted average of the CTEs of the α and β phases respectively [14]. The CTE values used for the FE simulations were between 9.0 x 10 -6 /°C at room temperature to 11.7 x 10 -6 /°C beyond the transus temperature of 1001°C, though other values are reported elsewhere, with alternative CTEs values ranging from 9.5 x 10 -6 /°C up to 12.8 x 10 -6 /°C during the α+β to β transformation [14][15][16].…”

Section: Methodsmentioning

confidence: 99%

The Determination of Residual Stress in Extruded Ti‐6Al‐4V by Contour Method and Finite Element Analysis

Pollard¹,

Rahimi²,

Watford³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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The contour method has been used to assess the level of residual stress generated during the post extrusion air cool and water quenching of a Ti-6Al-4V extruded bar. A length of the extrudate was transversally sectioned using electrical discharge machining (EDM), resulting in minimal damage to the cut surface; the stress relieved profile present at the cut surface was then measured using a coordinate measuring machine (CMM). The cut section was recreated in an ABAQUS finite element (FE) model and the inverse of the stress relieved profile recorded by CMM was applied as a boundary condition; by forcing the model's surface topology to match the measured cut surface, residual stresses normal, i.e. longitudinal stresses, to the cut surface of the extruded profile were then calculated. Results were compared to air cooling and quenching simulations performed in the DEFORM FE package. The distribution of tensile and compressive residual stresses observed via experimental and simulation work were found to be a good match with the distribution correlating with local variations of cooling rate during quenching.

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“…Metastable b or orthorhombic martensitic phases have been eliminated as measurable phase possibilities by diffraction. It is expected that SEM and TEM will validate the primarily martensitic powder structure [32,33]. Note that there does not appear to be significant peak broadening along the three major peaks indicating that while amorphous particles might be expected from the cooling rates, they do not account for a significant volume fraction of the powder analyzed.…”

Section: Composition and Xrdmentioning

confidence: 99%

Microstructural analysis of Ti–6Al–4V powder for cold gas dynamic spray applications

Birt

Champagne

Sisson

et al. 2015

Advanced Powder Technology

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Thermal expansion and lattice parameters of shaped metal deposited Ti–6Al–4V

Cited by 55 publications

References 26 publications

Examining trabecular morphology and chemical composition of peri-scaffold osseointegrated bone

Examining trabecular morphology and chemical composition of peri-scaffold osseointegrated bone

The Determination of Residual Stress in Extruded Ti‐6Al‐4V by Contour Method and Finite Element Analysis

Microstructural analysis of Ti–6Al–4V powder for cold gas dynamic spray applications

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