scholarly journals Diffusion Bonding of 1420 Al–Li Alloy Assisted by Pure Aluminum Foil as Interlayer

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1103
Author(s):  
Fan Wu ◽  
Wei Chen ◽  
Bing Zhao ◽  
Hongliang Hou ◽  
Wenlong Zhou ◽  
...  
Keyword(s):  
Diffusion Bonding ◽  
Pure Aluminum ◽  
Superplastic Forming ◽  
Aluminum Foil ◽  
Alloying Element ◽  
Specific Strength ◽  
Bonding Parameters ◽  
High Specific Strength ◽  
Aluminum Interlayer ◽  
Gleeble 3500

The Al–Li alloy is becoming popular for aerospace application owing to their low density, high specific strength, good corrosion resistance, etc. The diffusion bonding/superplastic forming (DB/SPF) structure of titanium alloy has been widely used in the aerospace industry. In order to broaden the application of Al–Li alloy, it is necessary to develop its diffusion bonding and superplastic forming (DB/SPF) technology. In the present study, diffusion bonding of 1420 Al–Li alloy assisted by pure aluminum foil was conducted on Gleeble-3500 thermal simulation system under different bonding parameters, the results show that the bonding temperatures have direct influence on the interface microstructure and bond strength of joints. Meanwhile, when the pure aluminum interlayer was introduced into the diffusion bonding process, the alloying element diffusion across the bond can improve the interface integrity and the mechanical properties. The joint formation mechanism with interlayer was investigated in detail, the development and application of this method was explored.

Superplastic Forming and Diffusion Bonding for Four-Layer Sheets Structure of Nickel-Base Superalloy

2007 ◽  
Vol 551-552 ◽  
pp. 163-168
Author(s):  
Wen Bo Han ◽  
D.Z. Wu ◽  
Guo Feng Wang ◽  
M.J. Tong
Keyword(s):  
Diffusion Bonding ◽  
Shear Fracture ◽  
Bonding Temperature ◽  
Superplastic Forming ◽  
Pressure Control ◽  
Nickel Foil ◽  
Nickel Base Superalloy ◽  
Bonding Parameters ◽  
And Diffusion ◽  
Foil Interlayer

The superplastic forming and diffusion bonding (SPF/DB) is applied in aviation and space flight field. The SPF/DB process with gas pressure control for dissimilar superalloy structure was studied. Diffusion bonding parameters, including bonding temperature T, pressure P, time t, affect the joining mechanism. When the bonded specimen with 50&m thick nickel foil interlayer was tensile at room temperature, shear fracture of the joints with nickel foil interlayer takes place at the GH4141 superalloy part. The SPF/DB of four-layer sheets structure was investigated. The optimum parameters for the SPF/DB process are: forming temperature T=1243K, forming pressure P=1MPa, forming time t=35min. The microstructure of the bonded samples was characterized. The microstructure shows an excellent bonding at the interfaces. The distribution of thickness after SPF/DB was investigated.

scholarly journals Current Trends in Dissimilar Diffusion Bonding of Titanium Alloys to Stainless Steels, Aluminium and Magnesium

2020 ◽  
Vol 4 (2) ◽  
pp. 39 ◽  
Author(s):  
Kavian O. Cooke ◽  
Anas M. Atieh
Keyword(s):  
Mechanical Properties ◽  
Diffusion Bonding ◽  
Scientific Literature ◽  
Advanced Materials ◽  
Specific Strength ◽  
Bonding Parameters ◽  
Current Trends ◽  
Bond Zone ◽  
The Relationship ◽  
Temperature Surface

This article provides a comprehensive review of the advancements made in the diffusion bonding of titanium and its alloys to other advanced materials such as aluminium, stainless steel, and magnesium. This combination of advanced alloys has received considerable attention in different industries, including aerospace, petrochemical, and nuclear applications due to high specific strength, lightweight, corrosion resistance, and moderate to high mechanical properties. The mechanisms of bond formation are discussed based on the type of microstructures formed and the mechanical properties achieved. The scientific literature identifies various methods/processes for controlling the volume of intermetallic compounds formed within the joint regions, as well as ways of maximising the strength of the weld/joints. This paper discusses the relationship between weld/bond properties and bonding parameters such as time, temperature, surface roughness, pressures, interlayer composition, and thickness. The scientific literature also shows that the bonding mechanisms and microstructural evolution of the bond zone can be significantly affected by suitable optimization of the bonding parameters. Additionally, this is a method of maximising bond strength.

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.

Precipitation in Al-Li-Cu Alloys

1981 ◽  
Vol 39 ◽  
pp. 44-45
Author(s):  
J. E. O'Neal ◽  
K. K. Sankaran
Keyword(s):  
Electron Microscopy ◽  
Age Hardening ◽  
Precipitation Behavior ◽  
Zone Formation ◽  
Specific Strength ◽  
Hardening Behavior ◽  
Cu Alloys ◽  
High Specific Strength ◽  
Transmission Electron ◽  
Structural Applications

Al-Li-Cu alloys combine high specific strength and high specific modulus and are potential candidates for aircraft structural applications. As part of an effort to optimize Al-Li-Cu alloys for specific applications, precipitation in these alloys was studied for a range of compositions, and the mechanical behavior was correlated with the microstructures.Alloys with nominal compositions of Al-4Cu-2Li-0.2Zr, Al-2.5Cu-2.5Li-0.2Zr, and Al-l.5Cu-2.5Li-0.5Mn were argon-atomized into powder at solidification rates ≈ 103°C/s. Powders were consolidated into bar stock by vacuum pressing and extruding at 400°C. Alloy specimens were solution annealed at 530°C and aged at temperatures up to 250°C, and the resultant precipitation was studied by transmission electron microscopy (TEM).The low-temperature (≲100°C) precipitation behavior of the Al-4Cu-2Li-0.2Zr alloy is a combination of the separate precipitation behaviors of Al-Cu and Al-Li alloys. The age-hardening behavior at these temperatures is characteristic of Guinier-Preston (GP) zone formation, with additional strengthening resulting from the coherent precipitation of δ’ (Al3Li, Ll2 structure), the presence of which is revealed by the selected-area diffraction pattern (SADP) shown in Figure la.

Microstructural Evolution in Al-Ti Multilayered Film with Annealing

1999 ◽  
Vol 5 (S2) ◽  
pp. 836-837
Author(s):  
R. Mitra ◽  
W.A. Chiou ◽  
A.Madan ◽  
R. Hoffman ◽  
J.R. Weertman
Keyword(s):  
Magnetron Sputtering ◽  
Ingot Metallurgy ◽  
Multilayered Film ◽  
Multilayered Structures ◽  
Multilayered Films ◽  
Specific Strength ◽  
The Past ◽  
High Specific Strength ◽  
Significant Interest ◽  
Deposited Film

There has been a significant interest in the development of dispersion-hardened aluminum for many years for high specific strength and modulus. Such materials are usually processed by powder or ingot metallurgy routes. In this study, Al3 Ti dispersion hardened Al was obtained by annealing Al-Ti multilayers. Al-Ti multilayered films have been characterized in the past by observing the structure of the layers, as well as tensile properties and hardness. This paper reports the structure of Al-Ti multilayers and the evolution of matrix and dispersoid microstructure on annealing.The Al-Ti multilayered structures were prepared by magnetron sputtering using Al and Ti as targets and either Si (100) or NaCl as substrates. The bi-layer thickness was maintained around 16 nm with Ti constituting 12% of the total. The substrate was alternately moved below the Al and Ti targets for the purpose of deposition. The as-deposited film on the substrate and NaCl salts were annealed at 400°C for periods between 1 and 24 h in a vacuum (10−5 torr) furnace.

Influence of the Flux Ratio N2/Ar on the Formation of Mo-N Modification Layers on Ti6Al4V by Plasma Reactive Sputtering

2009 ◽  
Vol 610-613 ◽  
pp. 1128-1131
Author(s):  
Xiu Yan Li ◽  
Ying Zhang ◽  
Bin Tang ◽  
Zhong Xu
Keyword(s):  
Substrate Surface ◽  
Surface Hardness ◽  
Flux Ratio ◽  
Reactive Sputtering ◽  
Load Bearing Capacity ◽  
Specific Strength ◽  
The Poor ◽  
High Specific Strength ◽  
Composition Structure ◽  
Oriented Parallel

Ti6Al4V alloy is promising biology material with outstanding properties of low density, high specific strength, and exceptional corrosion resistance. However, one of its disadvantages is the poor tribological property. In this paper Mo-N hard surface modification layers were formed on Ti6Al4V at 900°C substrate temperature by plasma reactive sputtering. The flux ratio N2/Ar is an important parameter and its influence on the composition, structure and hardness of the Mo-N layers is studied. The Mo-N layers are duplex layers, composed of diffusing layer and surface coating. The component of Mo and N elements in the diffusing layer changes gradually which can enhance the load-bearing capacity to the coating and ensure the durability of the coating. With the increase of the flux ratio N2/Ar, the content of N element in the Mo-N layers increases. The Mo-N layers were polycrystalline γ- Mo2N with (200) plane oriented parallel to the substrate surface. The surface hardness of the formed layers is in the range HK1330-1430. The hardness of the Mo-N layers increases with the increase of the flux ratio N2/Ar and the reason is that the content of N element in the Mo-N layers increases.

Optimization of the diffusion bonding parameters for SS316L/CuCrZr with and without Nickel interlayer

2016 ◽  
Vol 112 ◽  
pp. 274-282 ◽  
Author(s):  
K.P. Singh ◽  
Alpesh Patel ◽  
Kedar Bhope ◽  
S.S. Khirwadkar ◽  
Mayur Mehta
Keyword(s):  
Diffusion Bonding ◽  
Bonding Parameters

Research Progress of the Surface Oxidation of Titanium and its Alloys

2013 ◽  
Vol 748 ◽  
pp. 188-191
Author(s):  
Hui Jun Yu
Keyword(s):  
Titanium Alloys ◽  
Biomedical Applications ◽  
Influence Factors ◽  
Surface Oxidation ◽  
Research Progress ◽  
Corrosion Resistant ◽  
Specific Strength ◽  
Existing Problems ◽  
High Specific Strength ◽  
Micro Arc Oxidation

Titanium and titanium alloys possess some attractive properties, such as excellent corrosion and erosion resistance, low densities, high specific strength and modulus, enabling them extensively used in aeronautical, marine, chemical and biomedical applications and so on. Nevertheless, Recent years, the corrosion resistance of titanium and titanium alloys is required to elevate in some fields, proper surface modification such as surface oxidation can solve the problems effectively. In this paper, the recent investigations of thermal oxidation and micro-arc oxidation to improve the corrosion resistant of titanium and its alloys are reviewed. The structures, properties and their influence factors of the coatings are analysed systematically. And the existing problems and the future prospect of the further researches is mentioned.

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