Fabrication of TiAl intermetallic phases by heat treatment of warm sprayed metal precursors

2014 ◽  
Vol 49 ◽  
pp. 57-64 ◽  
Author(s):  
Judyta Sienkiewicz ◽  
Seiji Kuroda ◽  
Rafał M. Molak ◽  
Hideyuki Murakami ◽  
Hiroshi Araki ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Intermetallic Phases ◽  
Metal Precursors

TEM and X-Ray Examinations of Intermetallic Phases and Carbides Precipitation in an Fe-Ni Superalloy during Prolonged Ageing

2013 ◽  
Vol 212 ◽  
pp. 15-20
Author(s):  
Kazimierz J. Ducki ◽  
Jacek Mendala ◽  
Lilianna Wojtynek
Keyword(s):  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Precipitation Process ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Solid Samples ◽  
Structural Investigations ◽  
X Ray

The influence of prolonged ageing on the precipitation process of the secondary phases in an Fe-Ni superalloy of A-286 type has been studied. The samples were subjected to a solution heat treatment at 980°C for 2 h and water quenched, and then aged at temperatures of 715, 750 and 780°C at holding times from 0.5 to 500 h. Structural investigations were conducted using TEM and X-ray diffraction methods. The X-ray phase analyses performed on the isolates were obtained by anodic dissolution of the solid samples. After solution heat treatment the alloy has the structure of twinned austenite with a small amount of undissolved precipitates, such as carbide TiC, carbonitride TiC0.3N0.7, nitride TiN0.3, carbosulfide Ti4C2S2, Laves phase Ni2Si, and boride MoB. The application of ageing causes precipitation processes of γ-Ni3(Al,Ti), G (Ni16Ti6Si7), η (Ni3Ti), β (NiTi) and σ (Cr0.46Mo0.40Si0.14) intermetallic phases, as well as the carbide M23C6. It was found that the main phase precipitating during alloy ageing was the γ intermetallic phase.

Investigation of the Influence of Ultrasound Action on Diffusion Processes in an Explosion-Welded Bimetal System Cu-Al during Heat Treatment

2021 ◽  
Vol 410 ◽  
pp. 306-312
Author(s):  
Oleg V. Slautin ◽  
Dmitriy V. Pronichev ◽  
Evgeniy V. Kuz’min
Keyword(s):  
Heat Treatment ◽  
Composite Material ◽  
Diffusion Zone ◽  
Diffusion Processes ◽  
Intermetallic Phases ◽  
Layered Composite ◽  
Acoustic Vibrations ◽  
Fixed Temperature ◽  
Eutectic Transformation ◽  
Ultrasound Action

The influence of ultrasound on the main regularities of the formation and growth of the diffusion zone at the interlayer boundary of an explosion-welded layered composite material of Al-Cu systems is investigated. It is proved that the effect of ultrasound contributes to the reduction of the latent period of the nucleation of intermetallic phases at the interlayer boundary, lowers the temperature of the beginning of the eutectic transformation (by about 10 ° C), but at the same time does not affect the phase composition of the diffusion zone as a result of homogeneous reactions at the boundary of contact of solids. It has been established that the thickness of the diffusion zone, with the duration of the supplied acoustic vibrations, ensures the absence of cracks in the diffusion zone, leading to delamination of the material, increases by 30-40% at a fixed temperature of intense diffusion.

Ternary Phase Formation in 95Pb-5Sn Flip-Chip Solder Bonds

1993 ◽  
Vol 323 ◽  
Author(s):  
Alan J. Mockler ◽  
Peter J. Goodhew ◽  
Elizabeth A. Logan
Keyword(s):  
Heat Treatment ◽  
Solid State ◽  
Ternary Phase ◽  
Flip Chip ◽  
Phase Distribution ◽  
Intermetallic Phases ◽  
Ternary Diagram ◽  
Solid State Diffusion ◽  
Analysis Techniques ◽  
State Diffusion

AbstractThe microstructure of 95Pb-5Sn flip-chip solder bonds deposited on Cr/Cu/Au metallisation pads has been studied using both light and electron analysis techniques. The presence of Sn-Cu- Au ternary intermetallic phases was detected within the Pb-rich matrix at significant distances from the originally deposited interface. The distribution of the phases present after the solder has undergone a reflow heat treatment can be interpreted using recent equilibrium ternary diagram data. An investigation was also made into the effects of various non-reflow heat treatments at carefully chosen temperatures, to qualitatively evaluate the extent of solid state diffusion and the resultant phase distribution.

scholarly journals Phase Analysis of Explosive Welded Ti-Cr/Ni Steel in As-Received State and after Heat Treatment Using Synchrotron/ Analiza Fazowa Połączenia Ti-Cr/Stali Ni Wytworzonego Metodą Zgrzewania Wybuchowego W Stanie Wyjściowym Oraz Po Obróbce Termicznej Z Wykorzystaniem Promieniowania Synchrotonowego

2014 ◽  
Vol 59 (4) ◽  
pp. 1611-1614
Author(s):  
D. Ostroushko ◽  
E. Mazancová ◽  
K. Saksl ◽  
O. Milković
Keyword(s):  
Heat Treatment ◽  
Weld Line ◽  
Intermetallic Phases ◽  
Surface Coatings ◽  
Basic Material ◽  
X Ray Diffraction ◽  
Interface Area ◽  
Pressure Welding ◽  
X Ray ◽  
Economic Use

Abstract Surface coatings protection is one of the most important processes ensuring efficient and economic use of basic materials, mostly of lower-quality. At interface of clad and basic material intermetallic phases are formed, representing quite different matrix with dissimilar properties unlike the welded materials. One type of surface coating is explosive bonding which belongs to group of pressure welding. The work is focused on interface shape line, inhomogeneities in vicinity of the wave joint both in basic material and in vicinity of weld line of the Ti and Cr/Ni stainless steel (SS) matrix. Investigated weld was both in as-received state and after heat treatment carried out at 600°C/90 minutes/air. Presented phases have been identified using X-ray diffraction performed by synchrotron. The Tiα, Fe-fcc, Fe-bcc and intermetallic phases Fe2Ti were detected at interface area.

Intermetallic phases produced by the heat treatment of mechanically alloyed AlMo powders

1994 ◽  
Vol 185 (1-2) ◽  
pp. 77-86 ◽  
Author(s):  
M. Zdujić ◽  
D. Poleti ◽  
Lj. Karanović ◽  
K.F. Kobayashi ◽  
P.H. Shingu
Keyword(s):  
Heat Treatment ◽  
Intermetallic Phases ◽  
Mechanically Alloyed

Mechanical and Phase Analysis of Bonding Area Explosively Welded Ti-Cr/Ni Steel in as-Received State and after Heat Treatment Using Synchrotron (BW-5)

2014 ◽  
Vol 782 ◽  
pp. 155-160
Author(s):  
Dmytro Ostroushko ◽  
Eva Mazancová ◽  
Karel Saksl ◽  
Radoslav Halgaš
Keyword(s):  
Heat Treatment ◽  
Weld Line ◽  
Intermetallic Phases ◽  
Surface Coatings ◽  
Basic Material ◽  
Steel Matrix ◽  
X Ray Diffraction ◽  
Interface Area ◽  
Bonding Area ◽  
Economic Use

Surface coatings protection is one of the most important processes ensuring efficient and economic use of basic materials, mostly of lower-quality. At interface of clad and basic material intermetallic phases are formed, representing quite different matrix with dissimilar properties unlike the welded materials. One type of surface coating is explosive bonding which belongs to group of pressure welding. The work is focused on some mechanical properties, micro-and nanohardness controlled by AFM and interface shape line, in homogeneities in vicinity of the wave joint both in basic material and in vicinity of the Ti and Cr/Ni stainless steel matrix weld line. Investigated weld was both in as-received state and after heat treatment carried out at 600°C/90 minutes/air. Phases has been identified X-ray diffraction performed BW-5 beamline applying synchrotron radiation, and Tiα, Fe-fcc and Fe-bcc were detected at interface area, whereas intermetallic phases were not revealed.

The Effect of Solution Heat Treatment on Incipient Melting of Al2Cu Intermetallic Phase in Lightweight Materials

2016 ◽  
Vol 857 ◽  
pp. 256-260
Author(s):  
Chung Seok Kim ◽  
Jin Woo Jo ◽  
Hak Min Lee
Keyword(s):  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Single Step ◽  
Treatment Temperature ◽  
Solution Temperature ◽  
Incipient Melting ◽  
Cast Specimen ◽  
Eutectic Si

The effects of solution heat treatment of Al6Si2Cu aluminum alloy on incipient melting of θ-Al2Cu phase have been investigated. Solution heat treatments, in this study, are applied to improve of mechanical properties through a single-step solution heat treatment. The microstructure of as-cast specimen represents a typical dendrite structure having a secondary dendrite arm spacing of 37um. In addition to the Al matrix, a large amount of coarsen eutectic Si, θ-Al2Cu intermetallic phases and Fe-rich phases are identified. As the solution temperature increases, the Vickers's hardness increases up to 510°C and thereafter hardness decreases at the temperature of 520°C and 530°C. This hardness behavior may closely related with microstructural evolution such as solubility of alloying elements up to 510°C and also melting of θ-Al2Cu intermetallic phases over 510°C in this study. Consequentially, the optimal single-step solution heat treatment temperature should be 510°C to improve mechanical property.

Influence of Microstructure on the Corrosion Behavior of a Ni-Si Alloy

1984 ◽  
Vol 39 ◽  
Author(s):  
P. Kumar
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Corrosion Behavior ◽  
Processing Condition ◽  
Intermetallic Phases ◽  
Sulfate Ion ◽  
Corrosion Tests ◽  
Excellent Corrosion Resistance

ABSTRACTNickel-based alloys with over 7 percent silicon have excellent corrosion resistance to sulfuric acid, oleum and sulfate-ion-containing environments. This alloy is characterized by the presence of intermetallic Ni3Si (beta) and Ni5Si2 (gamma) phases in Ni-Si solid solution (alpha) matrix. The corrosion resistance is provided by the coarse intermetallic phases. Size of intermetallic phases is dependent on the processing condition and the heat treatment. The corrosion resistance can be changed by heat treatment.Results of corrosion tests are explained in terms of microstructural features.

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