scholarly journals Nanostructured materials based on pure titanium and bio-soluble magnesium alloy to create surgical implants

2011 ◽  
Vol 16 (4) ◽  
pp. 31-36
Author(s):  
K.V. Kutnij
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Biological Fluid ◽  
Pure Titanium ◽  
Titanium Implants ◽  
Future Application ◽  
Medical Implants ◽  
Fine Grained ◽  
Surgical Implants ◽  
Alloy We43

Influence of structural state on mechanical properties of pure titanium and magnesium alloy WE43 as candidates for use as nondegradable (titanium) and degradable (WE43) medical implants was studied. By the methods of severe plastic deformation in combination with programmed heat treatment the nanostructured pure titanium and ultra-fine-grained magnesium alloy WE43 were obtained. It is shown, that grain size substantially affects not only the mechanical properties of the indicated materials but also the corrosion rate of magnesium alloy WE43 in the medium simulating biological fluid. The possibility of replacing the titanium implants by nanostructured pure titanium and future application of degradable ultra-finegrained magnesium implants is discussed

scholarly journals STRUCTURE AND PROPERTIES OF AZ31 MAGNESIUM ALLOY AFTER COMBINATION OF HOT EXTRUSION AND ECAP

2017 ◽  
Vol 23 (3) ◽  
pp. 222 ◽  
Author(s):  
Ondřej Hilšer ◽  
Stanislav Rusz ◽  
Wojciech Maziarz ◽  
Jan Dutkiewicz ◽  
Tomasz Tański ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Hot Extrusion ◽  
Az31 Magnesium Alloy ◽  
Initial State ◽  
Fine Grained ◽  
Angular Pressing ◽  
Ecap Process ◽  
Average Grain Size ◽  
Fine Grained Structure

<p>Equal channel angular pressing (ECAP) method was used for achieving very fine-grained structure and increased mechanical properties of AZ31 magnesium alloy. The experiments were focused on the, in the initial state, hot extruded alloy. ECAP process was realized at the temperature 250°C and following route Bc. It was found that combination of hot extrusion and ECAP leads to producing of material with significantly fine-grained structure and improves mechanical properties. Alloy structure after the fourth pass of ECAP tool with helix matrix 30° shows a fine-grained structure with average grain size of 2 µm to 3 µm and high disorientation between the grains. More experimental results are discussed in this article.</p>

A Study of the Structure, Mechanical Properties and Corrosion Resistance of Magnesium Alloy WE43 After Rotary Swaging

2018 ◽  
Vol 60 (3-4) ◽  
pp. 253-258 ◽  
Author(s):  
N. S. Martynenko ◽  
E. A. Luk’yanova ◽  
M. M. Morozov ◽  
V. S. Yusupov ◽  
S. V. Dobatkin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Rotary Swaging ◽  
Alloy We43 ◽  
Mechanical Properties And Corrosion

FABRICATION AND TRIBOLOGICAL PROPERTIES OF GRADIENT FINE-GRAINED OXYGEN-BOOSTING LAYER ON ECAP-TREATED PURE TITANIUM SURFACE

2019 ◽  
Vol 26 (06) ◽  
pp. 1850199
Author(s):  
BAOSEN ZHANG ◽  
JIYING WANG ◽  
SHUAISHUAI ZHU ◽  
QIANGSHENG DONG ◽  
ZHANGZHONG WANG
Keyword(s):  
Mechanical Properties ◽  
Diffusion Process ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Titanium Surface ◽  
Pure Titanium ◽  
Coarse Grained ◽  
Wear Properties ◽  
Fine Grained ◽  
Equal Channel Angular Processing

The gradient fine-grained oxygen-boosting layer was prepared on equal channel angular processing (ECAP)-treated titanium with thermal oxidation and oxygen boost diffusion process, and tribological properties were systematically characterized. Results show that the as-prepared boosting layer consists of surface coarse-grained region, and inner fine-grained region. The corresponding thickness and mechanical properties further increase compared to those of virgin titanium. The oxygen-boosting layer reveals excellent anti-wear properties, the dominant wear mechanism of which is abrasive.

scholarly journals Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3627 ◽  
Author(s):  
Sergey Dobatkin ◽  
Natalia Martynenko ◽  
Natalia Anisimova ◽  
Mikhail Kiselevskiy ◽  
Dmitriy Prosvirnin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fatigue Strength ◽  
Magnesium Alloy ◽  
Total Elongation ◽  
Relative Mass ◽  
Ultrafine Grained ◽  
Alloy We43 ◽  
Average Size

In this work, the effect of an ultrafine-grained (UFG) structure obtained by multiaxial deformation (MAD) on the mechanical properties, fatigue strength, biodegradation, and biocompatibility in vivo of the magnesium alloy WE43 was studied. The grain refinement down to 0.93 ± 0.29 µm and the formation of Mg41Nd5 phase particles with an average size of 0.34 ± 0.21 µm were shown to raise the ultimate tensile strength to 300 MPa. Besides, MAD improved the ductility of the alloy, boosting the total elongation from 9% to 17.2%. An additional positive effect of MAD was an increase in the fatigue strength of the alloy from 90 to 165 MPa. The formation of the UFG structure also reduced the biodegradation rate of the alloy under both in vitro and in vivo conditions. The relative mass loss after six weeks of experiment was 83% and 19% in vitro and 46% and 7% in vivo for the initial and the deformed alloy, respectively. Accumulation of hydrogen and the formation of necrotic masses were observed after implantation of alloy specimens in both conditions. Despite these detrimental phenomena, the desired replacement of the implant and the surrounding cavity with new connective tissue was observed in the areas of implantation.

Strengthening of Magnesium Alloy WE43 by Rotary Swaging

2018 ◽  
Vol 941 ◽  
pp. 808-813 ◽  
Author(s):  
Natalia Martynenko ◽  
Elena Lukyanova ◽  
Mikhail Gorshenkov ◽  
Mikhail Morozov ◽  
Vladimir Yusupov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Tensile Elongation ◽  
Structural Elements ◽  
Chemical Corrosion ◽  
Rotary Swaging ◽  
Alloy We43 ◽  
Mechanical Properties And Corrosion ◽  
Average Size

The article presents the results of an investigation of microstructure, mechanical properties and corrosion resistance of magnesium alloy WE43 processed by rotary swaging. The resulting microstructure is characterized by an average size of structural elements of 0.5 – 0.8 μm. The grain refinement leads to an increase in the strength of the alloy to 393 – 416 MPa while the tensile elongation stays at a level of 7 – 12.5%. The microstructure produced by rotary swaging does not lead to deterioration of the resistance of the alloy to electrochemical and chemical corrosion.

Mechanical properties, corrosion behavior and biocompatibility of orthopedic pure titanium−magnesium alloy screw prepared by friction welding

2020 ◽  
Vol 30 (11) ◽  
pp. 2952-2966
Author(s):  
Mojtaba Sadeghi GOGHERI ◽  
Masoud KASIRI-ASGARANI ◽  
Hamid Reza BAKHSHESHI-RAD ◽  
Hamid GHAYOUR ◽  
Mahdi RAFIEI
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Friction Welding ◽  
Pure Titanium

Microstructure and Mechanical Properties of a Fine-Grained AZ91 Magnesium Alloy Prepared by Multi-Pass Friction Stir Processing

2016 ◽  
Vol 850 ◽  
pp. 778-783 ◽  
Author(s):  
Zhi Long Lu ◽  
Da Tong Zhang
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Az91 Magnesium Alloy ◽  
Magnesium Matrix ◽  
Friction Stir ◽  
Single Pass ◽  
Fine Grained ◽  
Microstructure And Mechanical Properties ◽  
Az91 Magnesium

Friction stir processing (FSP) is a novel severe plastic deformation technique developed in recent years to produce fine-grained structural materials. Through increasing the processing pass, further grain refinement can be achieved. In this paper, the microstructure and mechanical properties of AZ91 magnesium alloy prepared by the single-pass and two-pass FSP were studied. The results showed that the coarse, network-like eutectic β-Mg17Al12 phase was broken into particles and some of them dissolved into the magnesium matrix, and the α-Mg grains were remarkably refined after FSP. The average grain sizes of the single-pass and two-pass FSP alloys were 8.3 μm and 5.8 μm respectively. The ultimate tensile strengths of the specimens were 284.5 MPa and 319.7 MPa, and elongations were 13% and 14.5%, respectively. The improved mechanical properties of the two-pass FSP specimen were mainly attributed to the finer grain size and more homogenized microstructure.

Mechanical properties of ultra-fine grained AZ91 magnesium alloy processed by friction stir processing

2015 ◽  
Vol 628 ◽  
pp. 198-206 ◽  
Author(s):  
J.A. del Valle ◽  
P. Rey ◽  
D. Gesto ◽  
D. Verdera ◽  
J.A. Jiménez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Az91 Magnesium Alloy ◽  
Friction Stir ◽  
Fine Grained ◽  
Az91 Magnesium
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