scholarly journals Effects of brazing parameters on the microstructure and tensile shear force of copper sheets using amorphous filler metal

2018 ◽  
Vol 192 ◽  
pp. 01010 ◽  
Author(s):  
Prajak Jattakul ◽  
Kannachai Kanlayasiri
Keyword(s):  
Solid Solution ◽  
Shear Force ◽  
Filler Metal ◽  
Eutectic Structure ◽  
Tensile Shear ◽  
Surface Behavior ◽  
Maximum Value ◽  
Ductile Fractures ◽  
Matrix Region ◽  
Brazed Joints

In this research, the objective was to investigate and measure the microstructure, tensile shear force, and fracture surface behavior when copper sheets are brazed using Cu-Ni-Sn-P amorphous filler metal. In order to examine the microstructure and its properties, assessment of the Cu-Ni-Sn-P/copper brazed joints was conducted after furnace brazing under an argon atmosphere using specific parameters relating to temperature, holding time, and loading pressure. In order to assess the tensile shear force, tensile testing was carried out. All the joints exhibited sound bonding without voids or cracks, when brazing temperatures reached 680 °C, this resulted in a maximum value for tensile shear force of 696.325 N. The microstructure consisted of both Cu-rich solid solution and a (Cu, Ni)3P phase as a eutectic structure formed in the brazing joint, and then the Cu-rich solid solution was produced as a matrix region around the eutectic structure. Fracture analysis was conducted for brazed joints which showed the ductile fractures after the shear test.

Brazing of Porous Copper Foam with Copper Sheet Using CuNiSnP Amorphous Filler Metal

2021 ◽  
Vol 904 ◽  
pp. 382-386
Author(s):  
Niwat Mookam ◽  
Prajak Jattakul ◽  
Tipsuda Rakphet ◽  
Kannachai Kanlayasiri
Keyword(s):  
Solid Solution ◽  
Electric Furnace ◽  
Filler Metal ◽  
Eutectic Structure ◽  
Interfacial Microstructure ◽  
Copper Sheet ◽  
Copper Foam ◽  
Porous Copper ◽  
Brazed Joints ◽  
Brazed Joint

This research studies effects of the brazing time on interfacial microstructure of brazed joint between the porous copper foam (PCF) and Cu substrate using CuNiSnP amorphous filler metal. To examine the interfacial microstructure and its properties, an assessment of PCF/CuNiSnP/Cu brazed joints was conducted after electric furnace brazing under hydrogen (H2) atmosphere. The results showed that the interfacial microstructure was thick for short brazing time specimens and thin for prolonged brazing time specimens. The interfacial microstructures consisted of Cu-rich solid solution, (Cu, Ni)3P, and Cu3P as a eutectic structure discovered in the brazing region at different brazing times of 5, 10, and 20 min. Only the Cu-rich solid solution and (Cu, Ni)3P were found in the specimen with brazing time of 30 min. indicating that different brazing times affected interfacial microstructures and therefore reliability of the brazed joints.

scholarly journals Influence of Welding Speed on Characteristics of Non-Axisymmetric Laser-Tungsten Inert Gas Hybrid Welded Mg/Al Lap Joints with Zn Filler

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3789
Author(s):  
Xinze Lv ◽  
Hongyang Wang ◽  
Liming Liu
Keyword(s):  
Solid Solution ◽  
Intermetallic Compounds ◽  
Welding Speed ◽  
Solidification Rate ◽  
Eutectic Structure ◽  
Lap Joints ◽  
Inert Gas ◽  
Heat Sources ◽  
Base Metals ◽  
Tensile Shear

A non-axisymmetric laser-tungsten inert gas (TIG) heat source was designed to join Mg–Al dissimilar metals with pure Zn filler at a series of welding speeds (500–900 mm/min). Laser and TIG heat sources respectively acted on Al and Mg base metals to precisely control their dissolution into the welding pool. The solidification rate of liquid metal was controlled by adjusting the welding speed, then the reaction process of Mg, Al and Zn could be accurately regulated. The results indicated that various microstructures including Al solid solution, Zn solid solution, Mg–Zn intermetallic compounds (IMCs) and eutectic structure formed in the joint produced at different speeds. Lower welding speed (500 mm/min) caused the microstructure coarsening and higher welding speed (900 mm/min) would lead to the enrichment of MgZn2 intermetallic compounds. At the optimal welding speed of 800 mm/min in particular, fine MgZn2 IMCs grains uniformly distributed in the Al and Zn solid solution. The tensile-shear load reached a maximum of 1052.5 N/cm and the joint fractured at the fusion zone near the Al base metal.

Microstructure and Shear Strength in Brazing Joint of Mo-Cu Composite with 304 Stainless Steel by Ni-Cr-P Filler Metal

2015 ◽  
Vol 34 (4) ◽  
Author(s):  
Juan Wang ◽  
Jiteng Wang ◽  
Yajiang Li ◽  
Deshuang Zheng
Keyword(s):  
Solid Solution ◽  
Stainless Steel ◽  
Shear Strength ◽  
Electron Microscope ◽  
Filler Metal ◽  
Energy Dispersive Spectrometer ◽  
Eutectic Structure ◽  
304 Stainless Steel ◽  
Steel Joint ◽  
Scanning Electron

AbstractThe brazing of Mo-Cu composite and 304 stainless steel was carried out in vacuum with Ni-Cr-P filler metal at 980 °C for 20 min. Microstructure in Mo-Cu/304 stainless steel joint was investigated by field-emission scanning electron microscope (FE-SEM) with energy dispersive spectrometer (EDS) and shear strength was measured by shearing test. The results indicate that shear strength of the Mo-Cu/304 stainless steel joint is about 155 MPa. There forms eutectic structure of γ-Ni solid solution with Ni

scholarly journals Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 896 ◽  
Author(s):  
Duo Dong ◽  
Dongdong Zhu ◽  
Ye Wang ◽  
Gang Wang ◽  
Peng Wu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Reaction Layer ◽  
Filler Metal ◽  
Eutectic Structure ◽  
Intermetallic Alloy ◽  
Filler Alloy ◽  
Vacuum Brazing ◽  
Brazed Joints ◽  
Si3n4 Ceramics ◽  
Maximum Shear Strength

Vacuum brazing of TiAl intermetallic alloy to Si3N4 ceramics was performed using Ag-28Cu (wt.%) filler alloy. The brazing joints obtained at different brazing temperatures were studied in this work. The microstructure and the shear strength were analyzed in detail. The results show that the brazed joints could be divided into three regions: AlCu2Ti reaction layer near the Ti-48Al-2Cr-2Nb alloy, a typical Ag-Cu eutectic structure and a thin continuous TiN + Ti5Si3 reaction layer near the Si3N4 ceramics. The microstructure varied as the brazing temperature was increased from 1153 K/15 min to 1193 K/15 min. The shear strength of the joints first increased as the brazing temperature increased from 1153 K to 1173 K, and then decreased. The maximum shear strength reached 105.5 MPa at 1173 K/15 min and the mechanism was discussed.

Brazing of Low Carbon Steel Automotive Radiator Pipe Using of Cu-Zn Alloy

2011 ◽  
Vol 233-235 ◽  
pp. 2718-2721
Author(s):  
Yu Long Li ◽  
Jin Yang ◽  
Wei Li ◽  
Ye Xiao Yu
Keyword(s):  
High Efficiency ◽  
Filler Metal ◽  
Good Condition ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Tensile Shear ◽  
High Quality ◽  
Induction Brazing ◽  
Brazed Joints ◽  
Zn Alloy

In order to join the automotive radiator pipe with high-quality and high-efficiency, flame and induction brazing experiments of steel radiator were carried out using Cu-Zn alloy. Results show that Cu-Zn brazing filler metal can wet the steel well under different heating conditions. The average tensile-shear strength of the brazed joints was more than 400MPa. Brazing experiments of automotive radiator pipe were carried out for comparing the heating methods. Results show that the joints acquired by the induction brazing method were much better in the appearance, further; the amounts of brazing alloy were relatively less. Brazed radiator pipes were then electroplated, and sealability tests of the brazed pipe were investigated, which indicated the pipes and joints remained in good condition after the tests.

scholarly journals Micromorphology change and microstructure of Cu-P based amorphous filler during heating process

2019 ◽  
Vol 38 (2019) ◽  
pp. 651-661 ◽  
Author(s):  
XiangPing Xu ◽  
QiuJie Ma ◽  
ChunZhi Xia
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Filler Metal ◽  
Eutectic Structure ◽  
Heating Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Filler Metals ◽  
Morphology Changes ◽  
Scanning Electron

AbstractThe changes that occur in the microstructure of crystalline and amorphous Cu-P-Sn-Ni filler metals during the heating process were studied by high-temperature microscopy, and the composition of solders at certain temperatures were analyzed by scanning electron microscopy and X-ray diffraction. The amorphous solder was observed to transform from amorphic to crystalline during the process of heating and distinct surface morphology changes were apparent, while the internal structure of the crystalline brazing filler metal was found to be relatively stable. During the heating process, the amorphous brazing filler metal formed a ϒ-Cu solid solution with a small amount of Cu3P compounds, Cu88Sn22 and (Cu, Ni)3P phase compounds, ultimately forming the Cu88Sn22 + Ni12P5 + (Cu, Ni)3P3 three-element eutectic structure.

Elements Diffusion and Mechanical Properties of 15-5PH Stainless Steel Joint Brazed with BNi-2 Filler Metal

2016 ◽  
Vol 850 ◽  
pp. 700-705 ◽  
Author(s):  
Qian Qian Sun ◽  
Sheng Lu
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Stainless Steel ◽  
Melting Point ◽  
Bonding Strength ◽  
Joint Strength ◽  
Filler Metal ◽  
Holding Time ◽  
Middle Zone ◽  
Brazed Joints

The effects of brazing time on elements diffusion and bonding strength of vacuum brazed joints of 15-5PH stainless steel using filler metal BNi-2 were investigated. The results showed that the brazing time determined the content of diffused elements. If holding time is short the distribution of melting point depressants (MPD) concentrated on the middle zone of the joint, and the generation of brittle phases in the joint was unavoidable. With increasing time, MPD can diffuse to base metal adequately and full solid solution of nickel formed in the brazing joint. Joint strength firstly increased and then decreased with prolonging holding time.

Comparative Study of Copper Brazing with Ag-Cu-Zn and Ag-Cu-P Filler in Heat Treatment Furnace

2014 ◽  
Vol 937 ◽  
pp. 154-157 ◽  
Author(s):  
Rong Wang ◽  
Ya Juan Jin
Keyword(s):  
Heat Treatment ◽  
Eutectic Structure ◽  
Copper Surface ◽  
Joint Interface ◽  
Heat Treatment Furnace ◽  
Wetting Ability ◽  
Treatment Furnace ◽  
Brazed Joints ◽  
And Diffusion ◽  
Better Than

Wetting and spreading ability of Ag-Cu-Zn filler and Ag-Cu-P filler on copper surface under heat treatment furnace was studied. The microstructures of brazed joints of Ag-Cu-Zn and Ag-Cu-P filler under the same parameter were also observed. The microstructure shows that the wetting ability of Ag-Cu-Zn filler on the copper surface is better than Ag-Cu-P and its structure is uniformed and regulated. It is founded that there were obvious dissolution and diffusion between base metal and filler for the copper/Ag-Cu-Zn/copper joint, there were white and black eutectic structure formed in the joint interface.

Non-equilibrium Ti-Fe bulk alloys with ultra-high strength and enhanced ductility

2004 ◽  
Vol 851 ◽  
Author(s):  
Dmitri V. Louzguine-Luzgin ◽  
Larissa V. Louzguina-Luzgina ◽  
Hidemi Kato ◽  
Akihisa Inoue
Keyword(s):  
Solid Solution ◽  
Supersaturated Solid Solution ◽  
High Strength ◽  
Eutectic Structure ◽  
Solution Phase ◽  
Solid Solution Phase ◽  
Mechanical Fracture ◽  
Glassy Alloys ◽  
Fe Alloys ◽  
Bulk Alloys

ABSTRACTThe high-strength and ductile hypo-, hyper- and eutectic Ti-Fe alloys were formed in the shape of the arc-melted ingots with the dimensions of about 25–40 mm in diameter and 10–15 mm in height. The structure of the samples consists of cubic Pm 3 m TiFe and BCC Im 3 m β-Ti supersaturated solid solution phase. The arc-melted hypereutectic Ti65Fe35 alloy has a dispersed structure consisting of the primary TiFe phase and submicron-size eutectic structure. This alloy exhibits excellent mechanical properties: a Young's modulus of 149 GPa, a high mechanical fracture strength of 2.2 GPa, a 0.2 % yield strength of 1.8 GPa and 6.7 % ductility. The hard round-shaped intermetallic TiFe phase and the supersaturated β-Ti solid solution result in a high strength of the Ti65Fe35 alloy which in addition has much higher ductility compared to that of the nanostructured or glassy alloys. The reasons for the high ductility of the hypereutectic alloy are discussed.

Correlation Between Microstructure and Mechanical Properties of Diffusion Brazed MAR-M 247

1993 ◽  
Author(s):  
W. Miglietti
Keyword(s):  
Filler Metal ◽  
Turbine Blades ◽  
High Strength ◽  
Strength Properties ◽  
Joint Microstructure ◽  
Investment Cast ◽  
Diffusion Brazing ◽  
Brazed Joints ◽  
Joining Process ◽  
Turbine Blading

Diffusion brazing is a joining process utilized in the manufacture and repair of turbine blades and vanes. MAR-M247 is an investment cast Ni-based superalloy used for turbine blading and has good strength properties at high temperatures. The objectives of this work was to develop a diffusion brazing procedure to achieve high strength joints. A commercially available diffusion brazing filler metal of composition Ni-15Cr-3,5B of 100 μm thickness was used. With the desire to eliminate brittle centre-line phases, the effects of the processing variables (only temperature and time) on the joint microstructure was studied. Once the metallurgy of the joint was understood, mechanical property assessments were undertaken i.e. tensile and creep rupture tests, and the latter being the severest test to evaluate joint strength. The results demonstrated that the diffusion brazed joints had nearly equivalent mechanical strength to that of the parent metal. This showed that the resultant diffusion brazing parameters enabled effective and reliable joining of MAR-M247.

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