scholarly journals Semisolid Compression Brazing of Al50Si Alloy Using Zn-Al-Cu Filler Metal Assisted by SiC Particles

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Jing Xiao ◽  
Shun Li ◽  
Shuxin Bai ◽  
Degan Xiong ◽  
Yu Tang
Keyword(s):  
Mechanical Properties ◽  
Oxide Film ◽  
Bonding Strength ◽  
Filler Metal ◽  
Strengthening Effect ◽  
Metal Interface ◽  
Sic Particles ◽  
Particle Layer ◽  
Dislocation Strengthening ◽  
Sic Particle

Semisolid compression brazing of Al50Si alloy using Zn-Al-Cu filler metal assisted by SiC particles coating has been developed. The effects of the size and concentration of SiC particles on the microstructure and mechanical properties of the joints were studied. By using 1 μm SiC particles and the concentration of SiC particles increased to 3 g/m2, oxide film on the surface of base metal was completely disrupted and a good bonding strength was obtained. As SiC concentration further increased to 4 g/m2, colonies of SiC particle with nonwetting areas of filler metal formed at the interface, resulting in a decrease in the bonding strength. By using 5 μm SiC particles, the bonding strength was enhanced as SiC concentration increased from 1 g/m2 to 3 g/m2 due to the removal of the oxide film. By further increasing SiC concentration to 16 g/m2, the strength was constantly improved because of the dislocation strengthening effect generated at the SiC particle layer/filler metal interface. When SiC concentration increased to 32 g/m2, nonwetting area appeared inside the SiC particles layer, causing a decrease in the bonding strength.

scholarly journals Microstructures and Mechanical Properties of a Laser-Welded Joint of Ti3Al-Nb Alloy Using Pure Nb Filler Metal

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 785 ◽  
Author(s):  
Lin Wang ◽  
Daqian Sun ◽  
Hongmei Li ◽  
Xiaoyan Gu ◽  
Chengjie Shen
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Base Metal ◽  
Joint Strength ◽  
Filler Metal ◽  
Weld Zone ◽  
Strengthening Effect ◽  
Joint Properties ◽  
Microstructures And Mechanical Properties ◽  
Welding System

Ti3Al-Nb alloy (Ti-24Al-15Nb) was welded by a pulsed laser welding system without and with pure Nb filler metal. The results indicated that pure Nb filler metal had profound effects on the microstructures and mechanical properties of the laser-welded joints. The joint without filler metal consisted of the weld zone (α’2 + B2), heat affected zone HAZ1 (α2 + B2), HAZ2 (α2 + O + B2) and base metal (α2 + O + B2), and gas pores were generated in the weld resulting in the deterioration of the joint strength (330 MPa) and elongation (1.9%). When the Nb filler metal was used, the weld microstructure (NbTi solid solution + O + B2) was obtained, and the joint properties were significantly improved, which was associated with the strengthening effect of the NbTi solid solution, O phase precipitation and the slip transmission between O and B2 phases, and the restraining of the formation of martensite (α’2) and gas pores in the weld. The strength (724 MPa) and elongation (5.1%) of the joint increased by 119.4% and 168.4% compared with those of the joint without filler metal, and the joint strength was able to reach 81.7% of the base metal strength (886 MPa). It is favorable to use pure Nb filler metal for improving the mechanical properties of laser-welded Ti3Al-Nb alloy joints.

Semi-Solid Stirring Brazing of SiCp/A356 Composites and Aluminum Alloy in Air

2011 ◽  
Vol 189-193 ◽  
pp. 3521-3524 ◽  
Author(s):  
Hui Bin Xu ◽  
Quan Xiang Luo ◽  
Chun Tian Li ◽  
Chang Hua Du
Keyword(s):  
Aluminum Alloy ◽  
Oxide Film ◽  
Weld Seam ◽  
Filler Metal ◽  
Joint Region ◽  
Base Materials ◽  
Semi Solid ◽  
Micro Structures ◽  
Two Sides ◽  
Sic Particle

The semi-solid brazing process of SiCp/A356 composites and aluminum alloy was investigated. The two substrates were heated up to the semisolid temperature range of Zn-Al filler metal in the joint region by a resistance heating plate. At this point a stirrer was introduced into the weld seam in order to mix filler metal and the two sides of substrates into a single uniform joint. After stirring, specimens were sectioned for analysis of macro- and micro-structures along the weld region. The research shows that SiCp/A356 composites and aluminum can be successfully joining with semi-solid filler metal. It can be found that most of the oxide film on the surface of the base metal was disrupted and removed through the observation by SEM. The metallurgical bonds formed between the filler metal and the base materials. Moreover, the oxide film of surface of aluminum alloy was more thoroughly disrupted and removed than that of surface of composites with existing of Sic particle. The joint microstructure with globular α-Al grain enclosed by rich-Zn phase can be obtained after stirring brazing.

Influences of SiC Particle Size and Content on the Mechanical Properties and Wear Resistance of the Composites with Al Matrix

2008 ◽  
Vol 375-376 ◽  
pp. 430-434 ◽  
Author(s):  
Yi Yi Tao ◽  
Xiao Lan Ge ◽  
Xiao Jing Xu ◽  
Zuo Jiang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Wear Properties ◽  
Reinforcing Effect ◽  
Sic Particles ◽  
Al Matrix ◽  
Sic Particle

The SiCp/Al composites reinforced by SiC particles with various sizes and contents were prepared by cold compacting and subsequent hot extruding. The mechanical and wear properties of the compositions were investigated and the relevant mechanisms were discussed. It has been shown that the tensile strength and wear resistance increases with increasing SiCp content. SiC particles have a remarkable reinforcing effect on matrix Al. The composite with larger SiCp size (14μm) possesses better wear resistance than that with smaller SiCp size (130nm).

scholarly journals Study on the microstructure of air reactive brazing joint between Al2O3 ceramic and Q235 steel

2021 ◽  
Vol 2125 (1) ◽  
pp. 012071
Author(s):  
Tianpeng Wang ◽  
Mingcheng Sun ◽  
Hongqiang Li ◽  
Shaoyang Xiao ◽  
Yunan Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Film ◽  
Filler Metal ◽  
Al2o3 Ceramic ◽  
Q235 Steel ◽  
Base Steel

Abstract Q235 steel /Al2O3 ceramics were brazed with Ag-CuO filler metal at 1050°C and held for 15min in air. When brazing Q235 steel and Al2O3 ceramics directly, it was found that serious oxidation occurred on the steel side during the brazing process. Although the joining was realized, a loose oxide film was formed on the surface of the base steel, which affected the mechanical properties of joints. When Q235 steel with aluminized surface was adopted to braze with Al2O3 ceramics, a Al2O3 layer formed on the surface of Q235 steel successfully avoided the oxidation of Q235 steel, and a compact and defection-free joint was obtained. The typical organization of joint was Al2O3/ CuAl2O4/ CuO/ Ag/ CuO/ CuAl2O4 /Al2O3/ FeAl/ FeAl2/ Fe.

scholarly journals Microstructure and properties of ZrO2 ceramic and Ti-6A-4V alloy vacuum brazed by Ti-28Ni filler metal

2019 ◽  
Vol 91 (10) ◽  
pp. 35-41 ◽  
Author(s):  
Li Hong ◽  
Liu Xuan ◽  
Huang Haixin
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Filler Metal ◽  
Interfacial Microstructure ◽  
Holding Time ◽  
Metal Interface ◽  
Ceramic Filler ◽  
Rich Phase ◽  
Brazed Joints ◽  
Maximum Shear Strength

Reliable ceramics/metal joints have an extensive application in the aerospace and biomedical area. However, ZrO2ceramic has not been investigated systematically compared to the Si3N4and Al2O3ceramic. Therefore, successful brazing of ZrO2ceramic and Ti-6A-4V alloy was achieved by using a binary active Ti-28Ni filler metal in this paper. The effect of holding time on the microstructure of ZrO2 ceramic/filler metal interface and mechanical properties of brazed joints was investigated. The results indicated that the representative interfacial microstructure was ZrO2ceramic/Ti2O/Ni2Ti4O/Ti-rich phase/Ti2Ni+α-Ti. With the increase of holding time, the thickness of Ti-rich layer in the interface of ZrO2/Ti-6Al-4Vjoint decreased obviously due to the diffusion of Ti atoms. Substantial brittle intermetallic compounds Ti2Ni and Ni2Ti4O were formed in the joint, which were detrimental to the mechanical properties of the brazed joints. The maximum shear strength of joint was 112.7 MPa when brazed at 1060 °C for 10 min.

Effects of Particle Size and Distribution on the Microstructure and Mechanical Properties of SiC Reinforced Al-30Si Alloy Composite

2012 ◽  
Vol 271-272 ◽  
pp. 12-16 ◽  
Author(s):  
Zeng Lei Ni ◽  
Ai Qin Wang ◽  
Jing Pei Xie
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Tensile Strength ◽  
Physical Properties ◽  
Combined Effects ◽  
Alloy Composite ◽  
Microstructure And Mechanical Properties ◽  
Sic Particles ◽  
The Matrix ◽  
Sic Particle

This paper studied the combined effects of particle size and distribution on the mechanical properties of the SiC particle reinforced Al-30Si alloy composites. The microstructure of experimental material was analyzed by SEM, the tensile strength and physical properties were examined. The results show that, with the increase of the SiC particle size in the composites, the clustering degree of the SiC particles decreases in the matrix, the SiC particles distribute more ununiformly. The tensile strength is influenced by the SiC particle size, the tensile strength of the composite reinforced by 13μm sized SiC particles is the highest.

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.

The Interfacial Reaction Products and Mechanical Properties with Oxidized Layer Thickness of SiC Particle in 2014Al/SiC Composites

2000 ◽  
Vol 654 ◽  
Author(s):  
Youngman Kim ◽  
Jong-Hoon Jeong ◽  
Jae-Chul Lee
Keyword(s):  
Mechanical Properties ◽  
Layer Thickness ◽  
Interfacial Reaction ◽  
Bonding Strength ◽  
Water Soluble ◽  
Interfacial Bonding ◽  
Matrix Composites ◽  
Interfacial Bonding Strength ◽  
Al Matrix ◽  
Sic Particle

AbstractMetal matrix composites (MMC's) are known to have wide applications in parts of transportation devices such as automobiles and aircraft. Al matrix composites using SiC particles as reinforcements are especially spotlighted because of low cost, superior specific modulus, specific strength, wear resistance and high temperature stability. However, Al4C3 formed by the interfacial reaction between Al and SiC weakens the interfacial bonding strength. It is also known to be unstable in the water-soluble atmosphere.In this study, the passive oxidation of SiC powder is used as protective layer against the reaction between the Al matrix and the SiC particle. We investigated the changes in interfacial product of the composites and mechanical properties such as interfacial bonding strength, and tensile strength in terms of the oxidized layer thickness of the reinforcement.

A Study of Hot Extrusion of 6063 Aluminum Alloy-Clad AZ31B Magnesium Alloy Bar

2009 ◽  
Vol 610-613 ◽  
pp. 791-795 ◽  
Author(s):  
Guang Sheng Huang ◽  
Wei Xu ◽  
Guang Jie Huang ◽  
Fu Sheng Pan
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Oxide Film ◽  
Bonding Strength ◽  
Hot Extrusion ◽  
Good Corrosion Resistance ◽  
6063 Aluminum Alloy ◽  
Shear Bonding Strength

The magnesium alloys have poor corrosion resistance because of their low equilibrium potential and loose oxide film, while the aluminum and its alloys have good corrosion resistance due to their compact oxide film. In this study, a kind of aluminum and magnesium bimetallic bars, 6063 aluminum alloy-clad AZ31B magnesium alloy bars, were acquired through hot extrusion. The experimental results showed that the extrusion temperature of 653K or lower, as well as an extrusion speed of 2m/min or lower be used during the extrusion. The interfacial structure and mechanical properties of the bimetallic bars were studied. The interface between aluminum alloy and magnesium alloy was metallurgic bonding with the shear bonding strength of 53Mpa for as extruded sample. As annealing temperature or holding time increased, the jointed layer between aluminum alloy and magnesium alloy was broadened, which decreased of shear bonding strength, indicating that the heat treatment is deleterious. The bimetallic bars have lower identity, good corrosion resistance and preferable mechanical properties, which are promising constructional materials.

Crack-Healing Behavior of Mullite/SiC Particle/SiC Whisker Multi-Composite and Mechanical Properties of the Multi-Composite

2005 ◽  
Vol 475-479 ◽  
pp. 2071-2074
Author(s):  
Wataru Nakao ◽  
Sang Kee Lee ◽  
Masahiro Yokouchi ◽  
Koji Takahashi ◽  
Kotoji Ando
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Crack Healing ◽  
Strength Recovery ◽  
Sic Particles ◽  
Sic Whiskers ◽  
Surface Length ◽  
Sic Particle

For improving fracture toughness as well as endowing with excellent self-crack-healing ability, mullite/SiC particles /SiC whiskers multi-composites were developed. Crack-healing ability and the mechanical properties of the specimens were investigated. Mullite/ 20 vol% SiC whiskers, mullite/ 25 vol% SiC whiskers and mullite/ 15 vol% SiC whiskers/ 10 vol% SiC particles composites can completely heal the pre-crack of 100 ım in surface length by heat-treatment at 1300 oC for 2 h in air. However, not completeness of the strength recovery was caused for mullite/ 15 vol% SiC whiskers composite by crack-healing. In spite of the same SiC content, the crack-healing ability of mullite/ 15 vol% SiC whiskers/ 10 vol% SiC particles composite is superior to that of mullite/ 25 vol% SiC whiskers composite. Admixing with SiC whisker was effective for improvement in fracture toughness. Additionally, the fracture toughness was not reduced by admixing with SiC particles.

Sign in / Sign up

Export Citation Format

Share Document