Microstructure and Mechanical Properties of Porous Titanium Based on Controlling Young's Modulus

2017 ◽  
Vol 46 (8) ◽  
pp. 2041-2048 ◽  
Author(s):  
Xu Guangsheng ◽  
Kou Hongchao ◽  
Liu Xianghong ◽  
Li Fuping ◽  
Li Jinshan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Porous Titanium ◽  
Microstructure And Mechanical Properties

The Effect of Pressure and Pore-Forming Agent on the Mechanical Properties of Porous Titanium

2011 ◽  
Vol 217-218 ◽  
pp. 1191-1196
Author(s):  
Peng Zhang ◽  
Yuan Chen Qi ◽  
Wei Li
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Cortical Bone ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Porous Titanium ◽  
Human Bone ◽  
Cold Isostatic Press ◽  
Effect Of Pressure ◽  
Porous Ti

Porous titanium compacts were fabricated by powder metallurgy using cold isostatic press with and without pore forming agents. Their microstructure and mechanical properties were investigated in this study. These alloy powders were sintered under 1300°C in vacuum of 10-3 Pa for 2h, followed by furnace cooling. Young’s modulus of sintered Ti could equal that of human’s dense bones. It was found that the strength of porous Ti enhanced by increasing the pressure or decreasing the amounts of pore forming agents. We prepared a porous pure Ti with 30wt.% NH4HCO3 as pore forming agents whose modulus was near to the human cortical bone, as compared in the range from 10 to 30GPa of Young’s modulus for human bone.

Synthesis of Biodegradable β-TCP/PLGA Composites Using Microwave Energy

2006 ◽  
Vol 510-511 ◽  
pp. 758-761 ◽  
Author(s):  
Hyeong Ho Jin ◽  
Sang Ho Min ◽  
Kyu Hong Hwang ◽  
Ik Min Park ◽  
Hong Chae Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Young’S Modulus ◽  
Tricalcium Phosphate ◽  
Bending Strength ◽  
In Situ Polymerization ◽  
Young's Modulus ◽  
Microwave Energy ◽  
Microstructure And Mechanical Properties

Biodegradable β-tricalcium phosphate (β-TCP)/poly (lactide-co-glycolide) (PLGA) composites were synthesized by in situ polymerization with microwave energy. The influence of the β-TCP content in β-TCP/PLGA composites on the molecular weight, crystallinity, microstructure, and mechanical properties was investigated. As the molecular weight of composites decreased, the β-TCP content increased up to 10 wt%, while further raising of the β-TCP content above 10%, the molecular weight increased with increasing β-TCP content. This behavior may be ascribed to the superheating effect or nonthermal effect induced by microwave energy. It was found that the bending strength and Young’s modulus of the β-TCP/PLGA composites were proportional to the molecular weight of PLGA. The bending strength of the β-TCP/PLGA composites ranged from 18 to 38 MPa, while Young’s modulus was in the range from 2 to 6 GPa.

Effect of Heat Treatment on Microstructure and Mechanical Properties of a Ti-Mo-Zr Alloy

2011 ◽  
Vol 275 ◽  
pp. 155-158
Author(s):  
X.N. Zhang ◽  
Peng Cao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Young’S Modulus ◽  
Design Theory ◽  
Young's Modulus ◽  
Solution Treatment ◽  
Ingot Metallurgy ◽  
Orthopaedic Implant ◽  
Microstructure And Mechanical Properties ◽  
Zr Alloy

Recently there is increasing demand for the development of new -type titanium with a low elastic modulus for surgical orthopaedic implant applications. In this paper, we developed a new Ti-Mo-Zr alloy based on the d-electron alloy design theory. The designed Ti-12Mo-5Zr (at%) alloy was then produced using ingot metallurgy and evaluated pertaining to the effect of heat treatment on the microstructure and mechanical properties. The alloy exhibited a relatively low Young’s modulus similar to some typical  orthopaedic titanium alloys. Yield strength, tensile strength and Young’s modulus of the alloy decreased after solid solution treatment. The mechanism by which heat treatment affects the mechanical properties is discussed.

Microstructure and Mechanical Properties of Laminated Buckypaper/SiC Composite

2015 ◽  
Vol 816 ◽  
pp. 147-151
Author(s):  
Xing Li ◽  
Peng Xiao Huang ◽  
Hui Peng ◽  
Ying Zhou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Magnetron Sputtering ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Rf Magnetron Sputtering ◽  
Crack Deflection ◽  
Nanoindentation Testing ◽  
Microstructure And Mechanical Properties

The laminated Buckypaper/SiC composite was prepared by RF magnetron sputtering. For comparison, the monolithic SiC was also prepared in the present study. The microstructure and morphology of the prepared samples were characterized by SEM and XRD. The Young’s modulus, hardness and stiffness of the samples were investigated by nanoindentation testing. The results showed that the Buckypaper/SiC composite had an obviously multilayered microstructure at the nanoscale. Furthermore, the fracture toughness of the laminated Buckypaper/SiC composite could be improved by crack deflection and platelet pullout mechanisms. The laminated Buckypaper/SiC composite had higher Young’s modulus and stiffness than that of the monolithic SiC. However, its hardness was lower than that of monolithic SiC.

Mechanical Properties of Porous Titanium Compacts Reinforced by UHMWPE

2007 ◽  
Vol 539-543 ◽  
pp. 1033-1037 ◽  
Author(s):  
Naoyuki Nomura ◽  
Y. Baba ◽  
A. Kawamura ◽  
S. Fujinuma ◽  
Akihiko Chiba ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Bending Strength ◽  
Young's Modulus ◽  
Local Stress ◽  
Porous Titanium ◽  
Three Point Bending ◽  
Porous Ti ◽  
Ti Powder ◽  
Ultra High Molecular Weight

Porous Ti compacts reinforced by ultra-high molecular weight polyethylene (UHMWPE) were fabricated and their mechanical properties were evaluated. Ti powder atomized by plasma rotating electrode process (PREP) was sintered at temperatures ranging from 1473 K to 1673 K for 7.2 ks in a vacuum. The porous Ti compacts contain the porosity of about 40%, irrespective of the sintering temperature. Porous Ti/UHMWPE composites were successfully fabricated by compressing UHMWPE powder into the porous Ti compacts. The compacts exhibit open pore structure and enables the penetration of UHMWPE into pores in the compacts. Young’s modulus of the composites is higher than that of the porous Ti compacts. The increment in Young’s modulus is not simply explained by the rule of mixture because Young’s modulus of the UHMWPE is approximately 1.3 GPa. Three-point bending strength of the composites is improved, presumably due to the local stress relief by UHMWPE in the vicinity of neck in the composites.

scholarly journals Evolution of Microstructure and Mechanical Properties of Nanostructured NiFe Films under Influence of Heat Treatment

2021 ◽  
Vol 20 (2) ◽  
pp. 109-120
Author(s):  
V. M. Fedosyuk
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Surface Layer ◽  
Young’S Modulus ◽  
Heat Treatment Temperature ◽  
Young's Modulus ◽  
Treatment Temperature ◽  
Microstructure And Mechanical Properties ◽  
Internal Volume

. Nanostructured NiFe films were synthesized by pulsed electrolytic deposition on silicon with a gold sublayer, after which they have been subjected to to temperature treatment at 373-673 K in order to study the effect of heat treatment on the microstructure and mechanical properties of the objects under study. High-resolution atomic force microscopy has made it possible  to trace the stages of  microstructure evolution under the  influence of  heat treatment, including the process of  nonlinear increase in grain growth and two-stage agglomeration. It is shown that with an increase in heat treatment temperature to 673 K, the grain size increases from 68 to 580 nm in comparison with the initial sample, undergoing agglomeration processes at temperatures of  100 and 300 °C. The mechanical properties of nanostructured NiFe films have been studied by the nanoindentation method. The dependences of the hardness of Young’s modulus and the values of the resistance to elastoplastic deformation on depth have been obtained and analyzed in the paper. This approach has permitted to reveal differences in the behavior of the mechanical properties of the surface layer and the internal volume of the film under the action of different heat treatment temperatures, as well as to demonstrate the opposite reaction of different material layers to an increase in temperature. As a result of a thorough analysis of the deformation curves of nanoindentation, it has been found that the homogenization of the surface in combination with the activation of oxidation processes leads to the strengthening of near-surface layer of NiFe films. At the same time, the internal volume of the material is characterized by a nonlinear decrease in hardness and Young’s modulus with an increase in the heat treatment temperature. The explanation for this phenomenon has been found in the complex effect of a decrease in the number of grain boundaries (due to an increase in the average grain size with increasing temperature) and an increase in the concentration of gold atoms diffusing from the sublayer more actively with an increase in the processing temperature of NiFe films.

scholarly journals Effect of Graphene-Oxide Addition on the Microstructure and Mechanical Properties of Two-Stage Sintered Zirconia-Toughened Alumina (ZTA) Composites

2021 ◽  
Vol 335 ◽  
pp. 03019
Author(s):  
Hsien Loong Teow ◽  
Sivakumar Sivanesan ◽  
Se Yong Eh Noum ◽  
Ananthan Soosai ◽  
Suresh Muniandy
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Graphene Oxide ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
High Hardness ◽  
Two Stage ◽  
Total Hip ◽  
Microstructure And Mechanical Properties ◽  
Zirconia Toughened Alumina

United Nations has estimated that 130 million people would suffer from osteoarthritis worldwide by 2050. This disease would require patients to undergo a surgery known as Total Hip Replacement (THR) which has a failure rate of approximately 1 % with a lifespan of 20 years. The biomaterials used to manufacture this total hip artroplasty are mainly made of Zirconia-Toughened Alumina. In this work, Zirconia Toughened Alumina (ZTA) composites with 10 vol% Y-TZP content were doped with small amount (0.01 to 1 wt%) of graphene oxide (GO). The GO-doped ZTA composites were produced via two-stage sintering with T1 ranging between 1400°C and 1550°C, heating rate of 20°C/min, followed by T2 of 1350°C and 12 hours holding time. The sintered ZTA samples were then evaluated on its microstructure and mechanical properties such as bulk density, Vickers hardness, Young’s modulus and fracture toughness to investigate the effect of GO addition on ZTA samples prepared via two-stage sintering. The results showed that ZTA composites containing up 0.1 wt% GO is beneficial in improving the microstructural and mechanical properties of ZTA composites prepared via two-stage sintering. The sample recorded a high hardness of up to 18.5 GPa, Young’s modulus of 406 GPa and fracture toughness of 5.8 MPam1/2 when sintered at T1 of 1450℃.

scholarly journals Porous Titanium for Biomedical Applications: Evaluation of the Conventional Powder Metallurgy Frontier and Space-Holder Technique

2019 ◽  
Vol 9 (5) ◽  
pp. 982 ◽  
Author(s):  
Sheila Lascano ◽  
Cristina Arévalo ◽  
Isabel Montealegre-Melendez ◽  
Sergio Muñoz ◽  
José Rodriguez-Ortiz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Young’S Modulus ◽  
Biomedical Applications ◽  
Mechanical Response ◽  
Young's Modulus ◽  
Pure Titanium ◽  
Porous Titanium ◽  
Space Holder ◽  
Industrial Implementation

Titanium and its alloys are reference materials in biomedical applications because of their desirable properties. However, one of the most important concerns in long-term prostheses is bone resorption as a result of the stress-shielding phenomena. Development of porous titanium for implants with a low Young’s modulus has accomplished increasing scientific and technological attention. The aim of this study is to evaluate the viability, industrial implementation and potential technology transfer of different powder-metallurgy techniques to obtain porous titanium with stiffness values similar to that exhibited by cortical bone. Porous samples of commercial pure titanium grade-4 were obtained by following both conventional powder metallurgy (PM) and space-holder technique. The conventional PM frontier (Loose-Sintering) was evaluated. Additionally, the technical feasibility of two different space holders (NH4HCO3 and NaCl) was investigated. The microstructural and mechanical properties were assessed. Furthermore, the mechanical properties of titanium porous structures with porosities of 40% were studied by Finite Element Method (FEM) and compared with the experimental results. Some important findings are: (i) the optimal parameters for processing routes used to obtain low Young’s modulus values, retaining suitable mechanical strength; (ii) better mechanical response was obtained by using NH4HCO3 as space holder; and (iii) Ti matrix hardening when the interconnected porosity was 36–45% of total porosity. Finally, the advantages and limitations of the PM techniques employed, towards an industrial implementation, were discussed.

Mechanical properties of FeAlSi powders prepared by mechanical alloying from different initial feedstock materials

2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Young’S Modulus ◽  
Milling Time ◽  
Young's Modulus ◽  
Element Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles ◽  
Complete Homogenization

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.

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