scholarly journals Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen

2016 ◽  
Vol 61 (1) ◽  
pp. 25-30 ◽  
Author(s):  
J.R.S. Martins ◽  
R.O. Araújo ◽  
R.A. Nogueira ◽  
C.R. Grandini
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Wear Resistance ◽  
Internal Friction ◽  
Good Combination ◽  
Relaxation Processes ◽  
Mechanical Spectroscopy ◽  
Excellent Corrosion Resistance ◽  
Low Elastic Modulus ◽  
Internal Friction Spectra

Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.

Diffusion of Oxygen and Nitrogen in the Ti-15Mo Alloy Used for Biomedical Applications

2012 ◽  
Vol 326-328 ◽  
pp. 696-701 ◽  
Author(s):  
José Roberto Severino Martins ◽  
Renata Abdallah Nogueira ◽  
Raul Oliveira de Araújo ◽  
Carlos Roberto Grandini
Keyword(s):  
Mechanical Properties ◽  
Diffusion Coefficients ◽  
Biomedical Applications ◽  
Good Combination ◽  
Mechanical Spectroscopy ◽  
Matrix Metal ◽  
Excellent Corrosion Resistance ◽  
The Matrix ◽  
Exponential Factors ◽  
Interstitial Elements

The Ti-15Mo alloy is a promising material for use as a biomaterial because of its excellent corrosion resistance and its good combination of mechanical properties, such as fatigue, hardness, and wears resistance. This alloy has a body-centered predominantly cubic crystalline structure and the addition of interstitial atoms, such as oxygen and nitrogen, strongly alters its mechanical properties. Mechanical spectroscopy is a powerful tool to study the interaction of interstitial elements with the matrix metal or substitutional solutes, providing information such as the distribution and the concentration of interstitial elements. The objective of this paper is to study of the effects of heavy interstitial elements, such as oxygen and nitrogen, on the anelastic properties of the Ti-15Mo alloy by using mechanical spectroscopy measurements. In this study, the diffusion coefficients, pre-exponential factors, and activation energies were calculated for the oxygen in the Ti-15Mo alloy.

Diffusion of Nitrogen in Ti-13V-11Cr-3Al Alloys

2009 ◽  
Vol 283-286 ◽  
pp. 38-44 ◽  
Author(s):  
Carlos Roberto Grandini ◽  
Emerson Haruiti Kamimura ◽  
José Roberto Severino Martins ◽  
Hugo Ricardo Zschommler Sandim ◽  
Odila Florêncio
Keyword(s):  
Solid Solution ◽  
Internal Friction ◽  
Diffusion Coefficients ◽  
Crystalline Lattice ◽  
Mechanical Spectroscopy ◽  
Interstitial Concentration ◽  
Exponential Factors ◽  
Friction Measurements ◽  
Internal Friction Spectra ◽  
Interstitial Elements

Metals with a bcc crystalline structure such as Ti-13V-11Cr-3Al alloys have their physical properties significantly changed through the addition of interstitial elements such as oxygen and nitrogen. These metals can dissolve substantial amounts of interstitial elements forming solid solutions. Mechanical spectroscopy measurements constitute a powerful tool for studying interactions of these interstitial elements with other elements that make up the alloy. From these measurements, it is possible to obtain information regarding diffusion, interstitial concentration, interaction between interstitials, and other imperfections of the crystalline lattice. In this paper, Ti-13V-11Cr-3Al alloys with several amount of nitrogen, in a solid solution, were studied using mechanical spectroscopy (internal friction) measurements. The results presented complex internal friction spectra which were resolved in a series of constituent Debye peaks corresponding to different interactions and interstitial diffusion coefficients. Pre-exponential factors and activation energies were calculated for nitrogen in theses alloys.

scholarly journals Microstructural and Mechanical Properties of β-Type Ti–Nb–Sn Biomedical Alloys with Low Elastic Modulus

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 712 ◽  
Author(s):  
Peiyou Li ◽  
Xindi Ma ◽  
Duo Wang ◽  
Hui Zhang
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Elastic Modulus ◽  
Martensite Phase ◽  
Ti Alloy ◽  
Martensitic Phase Transition ◽  
Low Elastic Modulus ◽  
Nb Content ◽  
Biomedical Alloy ◽  
Cp Ti

The microstructural and mechanical properties of β-type Ti85-xNb10+xSn5 (x = 0, 3, 6, 10 at.%) alloys with low elastic modulus were investigated. The experimental results show that the Ti85Nb10Sn5 and Ti75Nb20Sn5 alloys are composed of simple α and β phases, respectively; the Ti82Nb13Sn5 and Ti79Nb16Sn5 alloys are composed of β and α″ phases. The content of martensite phase decreases with the increase of Nb content. The Ti82Nb13Sn5 and Ti79Nb16Sn5 alloys show an inverse martensitic phase transition during heating. The Ti85Nb10Sn5 and Ti82Nb13Sn5 alloys with the small residual strain exhibit the good superelastic properties in 10-time cyclic loading. The reduced elastic modulus (Er) of the Ti75Nb20Sn5 alloy (61 GPa) measured by using the nanoindentation technique is 2–6 times of that of human bone (10–30 GPa), and is smaller than that of commercial Ti-6Al-4V biomedical alloy (120 GPa). The Ti75Nb20Sn5 alloy can be considered as a novel biomedical alloy. The wear resistance (H/Er) and anti-wear capability (H3/Er2) values of the four alloys are higher than those of the CP–Ti alloy (0.0238), which indicates that the present alloys have good wear resistance and anti-wear capability.

Oxygen Diffusion in an Nb-Ta Alloy Measured by Mechanical Spectroscopy

2011 ◽  
Vol 312-315 ◽  
pp. 1228-1232
Author(s):  
Carlos Roberto Grandini ◽  
Luciano Henrique de Almeida ◽  
Durval Rodrigues Júnior
Keyword(s):  
Internal Friction ◽  
Crystalline Structure ◽  
Mechanical Spectroscopy ◽  
Substitutional Solute ◽  
Interstitial Atoms ◽  
Exponential Factors ◽  
Solute Interactions ◽  
Friction Measurements ◽  
Internal Friction Spectra ◽  
Interstitial Elements

When metals that present bcc crystalline structure receive the addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, they undergo significant changes in their physical properties because they are able to dissolve great amounts of those interstitial elements, and thus form solid solutions. Niobium and most of its alloys possess a bcc crystalline structure and, because Brazil is the largest world exporter of this metal, it is fundamental to understand the interaction mechanisms between interstitial elements and niobium or its alloys. In this study, mechanical spectroscopy (internal friction) measurements were performed on Nb-8.9wt%Ta alloys containing oxygen in solid solution. The experimental results presented complex internal friction spectra. With the addition of substitutional solute, interactions between the two types of solutes (substitutional and interstitial) were observed, considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms. Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for oxygen in this alloy.

Wear and Mechanical Properties of Fe-28Al and Fe-28Al-10Ti Alloys

2011 ◽  
Vol 295-297 ◽  
pp. 256-259
Author(s):  
Jing Li ◽  
Jin Shan Zhao
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Plastic Deformation ◽  
Wear Resistance ◽  
Sliding Wear ◽  
Bulk Material ◽  
Wear Test ◽  
Long Distance ◽  
Wear Performance ◽  
Worn Surface

Fe-28Al and Fe-28Al-10Ti alloys were prepared by mechanical alloying and hot pressed sintering. The mechanical properties and wear resistance were studied. The results show that Fe-28Al bulk material is mainly characterized by the low ordered B2 Fe3Al structure with some dispersed Al2O3 particles. The mechanical properties such as the hardness and strength of Fe-28Al-10Ti are significantly improved compared with Fe-28Al, which is attributed to the grain refinement and solid solution reinforcing with the addition of Ti element. The fracture mode is mainly the intergranular fracture. Fe-28Al-10Ti exhibits more excellent wear resistance than Fe-28Al, especially after long distance sliding wear test. There is difference in wear mechanisms of Fe-28Al and Fe-28Al-10Ti alloys. Under the load of 100N, there is obvious plastic deformation on the worn surface of Fe-28Al. Micro-crack and layer splitting occur on the surface of Fe-28Al. The main wear performance of Fe-28Al-10Ti is particle abrasion, the characteristics of which are micro cutting and micro furrows.

UGI 4418

Alloy Digest ◽  
2018 ◽  
Vol 67 (8) ◽  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Martensitic Stainless Steel ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Temperature Performance ◽  
Excellent Corrosion Resistance

Abstract UGI 4418 is a martensitic stainless steel with excellent corrosion resistance in aggressive environments combined with good mechanical properties, including toughness. It exhibits excellent cryogenic properties. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on high temperature performance, corrosion and wear resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-1292. Producer or source: Schmolz + Bickenbach USA Inc..

MUELLER ALLOY 6970

Alloy Digest ◽  
1978 ◽  
Vol 27 (12) ◽  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Excellent Corrosion Resistance

Abstract MUELLER Alloy 6970 (formerly MBCo. alloy 804) is a wrought alloy having excellent corrosion resistance when used with water and steam. It has good mechanical properties, excellent wear resistance and good machinability. These properties make it an ideal material for valve components. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-364. Producer or source: Mueller Brass Company.

NICORROS 400

Alloy Digest ◽  
1985 ◽  
Vol 34 (4) ◽  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Heat Exchangers ◽  
Heat Treating ◽  
Solid Solution Alloy ◽  
Excellent Corrosion Resistance ◽  
Nickel Copper ◽  
Wide Range

Abstract NICORROS 400 is a nickel-copper, solid-solution alloy having excellent corrosion resistance in a wide range of marine and chemical environments and good mechanical properties from sub-zero temperatures to about 900 F. Among its uses are pump parts, heat exchangers, petroleum production and refinery equipment and marine equipment. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-312. Producer or source: Vereingte Deutsche Metallwerke AG.

Synthesis of Ti(C,N)/Al2O3 by Mechanically Induced Self-Propagating Reactive Synthesis

2011 ◽  
Vol 695 ◽  
pp. 437-440
Author(s):  
Jian Feng Zhu ◽  
Lan Ye ◽  
Hai Tong ◽  
Fen Wang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Phase Transformation ◽  
Phase Composition ◽  
Flexural Strength ◽  
Good Combination ◽  
Powder Morphology ◽  
Reactive Synthesis ◽  
Morphology Characteristics

Ti(C,N)/Al2O3in situ solid solution composites have been synthesized by mechanically induced self-propagating reactive synthesis (MSR) from the mixture of Ti, Al, C and TiO2in nitrogen milling atmosphere. The phase transformation and powder morphology characteristics were studied by using XRD and SEM. Full dense and pure Ti(C,N)/Al2O3composites were fabricated at 1450 °C for 1 h under 10 MPa. The phase composition, microstructure and some mechanical properties of the composites were investigated. The results show that the synthesized Ti(C,N)/Al2O3composites posses a density of 4.66 g/cm3and a good combination of mechanical properties of hardness of 25.54 GPa and the flexural strength of 404 MPa. The reaction process mechanism was also discussed.

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