Modeling of Diffusion Bonding Time in Dissimilar Titanium Alloys: Preliminary Results

2016 ◽  
Vol 138 (12) ◽  
Author(s):  
Neha Kulkarni ◽  
M. Ramulu ◽  
Daniel G. Sanders
Keyword(s):  
Titanium Alloys ◽  
Diffusion Bonding ◽  
Weight Ratio ◽  
Superplastic Forming ◽  
High Strength ◽  
Bonding Time ◽  
Bonding Parameters ◽  
Aerospace Applications ◽  
Dissimilar Alloys ◽  
Structural Parts

Titanium alloys are excellent candidates for aerospace applications due to their high strength-to-weight ratio and corrosion resistance. In the aerospace industry, diffusion bonding (DB) combined with superplastic forming is widely adopted to produce near net shape of titanium alloy structural parts. Of all the titanium alloys, bonding parameters have been well established for producing high-quality bonds only between Ti-6Al-4V and Ti-6Al-4V. The DB of similar alloys has been modeled successfully by many researchers. However, to date the DB time has not been modeled for dissimilar alloys. In the current work, the probabilistic model developed to predict DB time in similar titanium alloys is adapted for prediction of bonding time for Ti-64SG/Ti-6Al-2Sn-4Zr-2Mo SG dissimilar titanium alloys.

Superplastic Forming/Diffusion Bonding of a Titanium Alloy for the Realization of an Aircraft Structural Component in Multi-Sheets Configuration

2012 ◽  
Vol 504-506 ◽  
pp. 717-722 ◽  
Author(s):  
Luigi Carrino ◽  
Valentino Paradiso ◽  
Stefania Franchitti ◽  
Antonino Squillace ◽  
Salvatore Russo
Keyword(s):  
Diffusion Bonding ◽  
Weight Ratio ◽  
Superplastic Forming ◽  
High Strength ◽  
Production Costs ◽  
Single Shot ◽  
Forming Process ◽  
Element Analysis ◽  
Thickness Prediction ◽  
Superplastic Properties

Superplastic forming and diffusion bonding (SPF/DB) is a near-net-shape forming and joining process used with alloys having superplastic properties in order to make manufact which should have light weight and high stiffness. The aerospace is one of those sectors in which such technology is mainly used. This process allows to reduce the buy-to-fly ratio and consequently the production costs thanks to the possibility to produce complex shape components in a single shot. The material widely used for this application is the Ti-6Al-4V alloy for its high strength vs weight ratio, excellent mechanical proprieties, corrosion resistance and galvanic compatibility with carbon fiber reinforced composite materials. In this study, finite element analysis of the SPF/DB process has been carried out in order to investigate the thickness prediction, the optimization of the tooling’s geometry and the definition of the sheets initial thickness in the blow forming process of a multi-sheets configuration.

scholarly journals Effect of microstructure and cooling rate on the fatigue performance of TIMETAL® 575

2020 ◽  
Vol 321 ◽  
pp. 12019
Author(s):  
M. Bodie ◽  
M. Thomas ◽  
A. Ayub
Keyword(s):  
Titanium Alloys ◽  
Cooling Rate ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Electron Backscatter Diffraction ◽  
Material Selection ◽  
Weight Ratio ◽  
High Strength ◽  
Fatigue Performance ◽  
Aerospace Applications

A key design consideration for material selection in the aerospace industry is weight reduction; with excellent strength to weight ratio, high temperature resistance, and fatigue performance, titanium alloys are extensively used. New titanium alloys continue to enhance performance and broaden the range of applications. Titanium Metals Corporation (TIMET) recently developed TIMETAL® 575 (Ti575), a high strength titanium alloy with superior fatigue performance over Ti-6Al-4V, aimed at aerospace applications where these properties are imperative i.e. aerospace turbine discs and blades. [1] [2] This work intends to advance the understanding of the effect of thermal processing of Ti575, by investigating the effect of primary alpha (αp) volume fraction and cooling rate on tensile and fatigue performance in post forged heat-treated microstructures. Microstructural assessment and mechanical performance were completed and are discussed. Three cooling methods from three solution heat-treat temperatures were investigated in this work. The results from these experiments were compared using optical microscopy, electron backscatter diffraction (EBSD), room temperature tensile and high cycle fatigue (HCF) tests.

scholarly journals A Comparative Study on the Substructure Evolution and Mechanical Properties of TIMETAL® 407 and Ti-64

2020 ◽  
Vol 321 ◽  
pp. 11045
Author(s):  
Zachary Kloenne ◽  
Gopal Viswanathan ◽  
Matt Thomas ◽  
M.H. Lorreto ◽  
Hamish L. Fraser
Keyword(s):  
Titanium Alloys ◽  
High Strain ◽  
Weight Ratio ◽  
High Strength ◽  
Deformation Mechanisms ◽  
Strain Rates ◽  
Aerospace Applications ◽  
Beta Titanium ◽  
Excellent Candidate ◽  
Split Hopkinson

Titanium and titanium alloys are excellent candidates for aerospace applications owing to their high strength to weight ratio. Alpha/beta titanium alloys are used in nearly all sections of the aircraft, including the fuselage, landing gear, and wing. Ti-6Al-4V is the workhorse alloy of the titanium industry, comprising of nearly 60% of total titanium production. TIMETAL® 407, Ti-0.85Al-3.9V-0.25Si-0.25Fe (Ti-407) is an excellent candidate for alloy applications requiring excellent machinability and increased energy absorption. These properties are a result of the alloy’s increased ductility while maintaining moderate levels of strength. In this study, the deformation mechanisms of Ti-407 have been studied at high strain rates using split-Hopkinson bar testing. Utilizing post-mortem characterization, Ti-407 has been shown to deform significantly by ⟨c+a⟩ slip and deformation twinning. The observation of ⟨c+a⟩ slip is in contrast with other studies and will be discussed further.

SANDVIK Ti-3Al-2.5V GRADE 9

Alloy Digest ◽  
1997 ◽  
Vol 46 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Endurance Limit ◽  
Weight Ratio ◽  
High Strength ◽  
Strain Ratio ◽  
Bend Strength ◽  
Aerospace Applications ◽  
Excellent Corrosion Resistance ◽  
Titanium Aluminum ◽  
Fatigue Endurance

Abstract Sandvik Ti-3Al-2.5V Grade 9 titanium-aluminum alloy offers excellent corrosion resistance, especially to chloride media, and has a high strength-to-weight ratio, which is especially suitable for use in aerospace applications. Tubing can be produced having a CSR (contractile strain ratio) that enhances the fatigue endurance limit. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as fatigue. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: TI-109. Producer or source: Sandvik.

Nanostructured Ni/Al2O3 Interlayer: Transient Liquid Phase Diffusion Bonding of Al6061-MMC

2019 ◽  
Author(s):  
Kavian Cooke ◽  
Tahir Khan
Keyword(s):  
Liquid Phase ◽  
Diffusion Bonding ◽  
Joint Strength ◽  
Transient Liquid Phase ◽  
Weight Ratio ◽  
Bonding Time ◽  
Joint Interface ◽  
Full Potential ◽  
Phase Diffusion ◽  
Alumina Particles

Aluminum metal matrix composites are materials frequently used in the automotive and aerospace industries due to their high strength-to-weight ratio, formability, corrosion resistance, and long-term durability. However, despite the unique properties of these materials, the lack of a reliable joining method has restricted their full potential in engineering applications. This article explores the effect of bonding time on transient liquid phase diffusion bonding of Al6061 containing 15 vol.% alumina particles using a 5 μm electrodeposited Ni-coating containing nano-sized alumina particles as the interlayer. Joint formation was attributed to the solid-state diffusion of Ni into the Al6061 alloy followed by eutectic formation and isothermal solidification at the joint interface. Examination of the joint region using scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction showed the formation of eutectic phases such as Al3Ni, Al9FeNi, and Ni3Si within the joint zone. The results indicate that the addition of nano-size reinforcements into the interlayer can be used to improve joint strength. The joint strength recorded was 136 MPa at a bonding time of 10 min with a marginal increase in the shear strength when the bonding time is increased to 30 min.

Mechanical Behaviour of Beta Titanium Alloys

2021 ◽  
Vol 1016 ◽  
pp. 964-970
Author(s):  
Nageswara Rao ◽  
Geetha Manivasagam
Keyword(s):  
Heat Treatment ◽  
Titanium Alloys ◽  
Dynamic Properties ◽  
Solution Treatment ◽  
Weight Ratio ◽  
High Strength ◽  
Static Properties ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Titanium Alloys

Beta titanium alloys have several attractive features; this has resulted in this group of alloys receiving much attention since 1980’s. Among the attributes which distinguish them for their superiority over other structural materials are (i) high strength to which they can be heat treated, resulting in high strength to weight ratio (ii) high degree of hardenability which enables heat treatment in large section sizes to high strength levels (iii) excellent hot and cold workability, making them as competitive sheet materials etc. The standard heat treatment consists of solution treatment in beta or alpha plus beta phase field followed by aging. However, certain aging treatments can render the materials in a state of little or no ductility; the designer has to be aware of this behaviour and has to keep away from such treatments while working with the materials. Such unfavourable aging treatments may adversely affect not only the static properties such as reduction in area and elongation in a tensile test, but also dynamic properties such as impact toughness. Results of fractographic studies are in line with those of mechanical testing. The authors would present the foregoing analysis, based primarily on the wide-ranging researches they carried out on beta titanium alloy Ti15-3 and to some extent data published by researchers on other grades of beta titanium alloys. An attempt is made to explain the mechanisms underlying the embrittlement reactions that take place in beta titanium alloys under non-optimal aging treatments.

scholarly journals An Overview on the Tribological Performance of Titanium Alloys with Surface Modifications for Biomedical Applications

Lubricants ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 65 ◽  
Author(s):  
Kaur ◽  
Ghadirinejad ◽  
Oskouei
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Titanium Alloys ◽  
Weight Ratio ◽  
High Strength ◽  
Surface Modifications ◽  
Tribological Performance ◽  
The Body ◽  
High Wear Resistance ◽  
Medical Implants

The need for metallic biomaterials will always remain high with their growing demand in joint replacement in the aging population. This creates need for the market and researchers to focus on the development and advancement of the biometals. Desirable characteristics such as excellent biocompatibility, high strength, comparable elastic modulus with bones, good corrosion resistance, and high wear resistance are the significant issues to address for medical implants, particularly load-bearing orthopedic implants. The widespread use of titanium alloys in biomedical implants create a big demand to identify and assess the behavior and performance of these alloys when used in the human body. Being the most commonly used metal alloy in the fabrication of medical implants, mainly because of its good biocompatibility and corrosion resistance together with its high strength to weight ratio, the tribological behavior of these alloys have always been an important subject for study. Titanium alloys with improved wear resistance will of course enhance the longevity of implants in the body. In this paper, tribological performance of titanium alloys (medical grades) is reviewed. Various methods of surface modifications employed for titanium alloys are also discussed in the context of wear behavior.

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