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Microstructure and properties of Cu/Al joints brazed with Zn-Al filler metals 被引量:21
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作者 姬峰 薛松柏 +2 位作者 娄继源 娄银斌 王水庆 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期281-287,共7页
The mechanical properties and microstructural distribution of the Cu/A1 brazing joints formed by torch-brazing with different Zn-A1 filler metals were investigated. The microstructure of the Zn-A1 alloys was studied b... The mechanical properties and microstructural distribution of the Cu/A1 brazing joints formed by torch-brazing with different Zn-A1 filler metals were investigated. The microstructure of the Zn-A1 alloys was studied by optical microscopy and scanning electron microscopy, and the phase constitution of the Cu/A1 joints was analyzed by energy dispersion spectrometry. The results show that the spreading area of the Zn-A1 filler metals on the Cu and A1 substrates increases as the A1 content increases. The mechanical results indicate that the shear strength reaches a peak value of 88 MPa when A1 and Cu are brazed with Zn-15AI filler metal. Microhardness levels from HV122 to HV515 were produced in the three brazing seam regions corresponding to various microstructure features. The Zn- and Al-rich phases exist in the middle brazing seam regions. However, two interface layers, CuZn3 and A12Cu are formed on the Cu side when the A1 content in the filler metals is 2% and more than 15%, respectively. The relationship between intermetallic compounds on Cu side and Zn-xA1 filler metals was investigated. 展开更多
关键词 Cu/A1 brazing joint Zn-A1 filler metals mechanical property interface layer
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Theoretical study and numerical simulation of the stress fields of the Al_2O_3 joints brazed with composite filler materials 被引量:5
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作者 杨建国 姬书得 方洪渊 《China Welding》 EI CAS 2006年第3期74-78,共5页
Non-linear finite element code MSC. Marc was utilized to analysis the field of stress of the Al2O3 joints brazed with composite filler materials. The properties of the filler materials were defined by using the mixing... Non-linear finite element code MSC. Marc was utilized to analysis the field of stress of the Al2O3 joints brazed with composite filler materials. The properties of the filler materials were defined by using the mixing law, method of Mori-Tanaka and theory of Eshelby to ensure the accuracy and reliability of results of finite element method (FEM). The results show stress in brazed beam is higher than that in base material. The maximal stress can be found in the interface of joint. And the experimental results show that the shear strength of joints increases from 93.75 MPa ( Al2O3p Ovol. % ) to 135.32 MPa ( Al2O3p 15vol. % ) when composition of titanium is 3wt% in the filler metal. 展开更多
关键词 composite filler materials brazed joints finite element method residual stress
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Thermal cycling behavior of alumina-graphite brazed joints in electron tube applications
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作者 Nadadulal DANDAPAT Sumana GHOSH +2 位作者 Kalyan Sundar PAL Someswar DATTA Bichitra Kumar GUHA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第6期1666-1673,共8页
Alumina was joined with graphite by active metal brazing technique at 895,900,905,and 910 ℃ for 10 min in vacuum of0.67 mPa using Ti-Cu-Ag(68.8Ag-26.7Cu-4.5Ti;mass fraction,%) as filler material.The brazed samples ... Alumina was joined with graphite by active metal brazing technique at 895,900,905,and 910 ℃ for 10 min in vacuum of0.67 mPa using Ti-Cu-Ag(68.8Ag-26.7Cu-4.5Ti;mass fraction,%) as filler material.The brazed samples were thermal cycled between 30 and 600 ℃ and characterized.X-ray diffraction results show strong reaction between titanium and carbon as well as titanium and alumina.Scanning electron microscopy and helium leak tests show that the initial and thermal cycled brazed samples are devoid of cracks or anv other defects and hermeticity in nature.Brazing strength of the joints is found to be satisfactory. 展开更多
关键词 brazed joints thermal cycling brazing strength hermeticity
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Ultrasonic C-scan inspection of brazed joint in thin panel honeycomb structure
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作者 刘斌 刚铁 《China Welding》 EI CAS 2014年第4期32-36,共5页
The non-destructive testing of brazed joint in honeycomb structure with thin panel ( thickness : 0. 2 mm) was studied by ultrasonic C-scan method. Samples with different types of artificial defect were designed; th... The non-destructive testing of brazed joint in honeycomb structure with thin panel ( thickness : 0. 2 mm) was studied by ultrasonic C-scan method. Samples with different types of artificial defect were designed; the characteristic signal and the main parameters of the test were determined by the pre-experiment, and then parameters were optimized by orthogonal design, finally the optimum process was verified by a single panel sample. The multiple reflection echoes were chosen as the characteristic signal. The optimal C-scan results were achieved when the 20 MHz focus probe was used, and the pass band range for received signal were selected as 8 - 17. 5 MHz. The defects such as incomplete penetration and core damage can be detected with ultrasonic C-scan, and the detection accuracy can reach to 1 ram. 展开更多
关键词 non-destructive testing ultrasonic C-scan honeycomb structure brazed joint orthogonal design
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Microstructure and Strength of Brazed Joints of Ti_(3)Al Base Alloy with Cu-P Filler Metal
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作者 Peng HE Jicai FENG Heng ZHOU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第4期493-498,共6页
Brazing of Ti3Al alloys with the filler metal Cu-P was carried out at 1173-1273 K for 60-1800 s. When products are brazed, the optimum brazing parameters are as follows: brazing temperature is 1215-1225 K; brazing ti... Brazing of Ti3Al alloys with the filler metal Cu-P was carried out at 1173-1273 K for 60-1800 s. When products are brazed, the optimum brazing parameters are as follows: brazing temperature is 1215-1225 K; brazing time is 250-300 s. Four kinds of reaction products were observed during the brazing of Ti3Al alloys with the filler metal Cu-P, i.e., Ti3Al phase with a small quantity of Cu (Ti3Al(Cu)) formed close to the Ti3Al alloy; the TiCu intermetallic compounds layer and the Cu3P intermetallic compounds layer formed between Ti3Al(Cu) and the filler metal, and a Cu-base solid solution formed with the dispersed Cu3P in the middle of the joint. The interracial structure of brazed Ti3Al alloys joints with the filler metal Cu-P is Ti3Al/Ti3Al(Cu)/TiCu/Cu3P/Cu solid solution (Cu3P)/Cu3P/TiCu/Ti3Al(Cu)/Ti3Al, and this structure will not change with brazing time once it forms. The thickness of TiCu+Cu3P intermetallic compounds increases with brazing time according to a parabolic law. The activation energy Q and the growth velocity/to of reaction layer TiCu+Cu3P in the brazed joints of Ti3Al alloys with the filler metal Cu-P are 286 kJ/mol and 0.0821 m2/s, respectively, and growth formula was y2=O.O821exp(-34421.59/T)t.Careful control of the growth for the reaction layer TiCu+Cu3P can influence the final joint strength. The formation of the intermetallic compounds TiCu+Cu3P results in embrittlement of the joint and poor joint properties. The Cu-P filler metal is not fit for obtaining a high-quality joint of Ti3Al brazed. 展开更多
关键词 brazed joints MICROSTRUCTURE Ti3Al base alloy
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Effects of germanium additions on microstructures and properties of Al-Si filler metals for brazing aluminum 被引量:1
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作者 牛志伟 黄继华 +1 位作者 陈树海 赵兴科 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期775-782,共8页
A series of Al?Si?Ge filler metals were studied for brazing aluminum. The microstructures and properties of the filler metals were investigated systematically. The results show that the liquidus temperature of Al?Si?G... A series of Al?Si?Ge filler metals were studied for brazing aluminum. The microstructures and properties of the filler metals were investigated systematically. The results show that the liquidus temperature of Al?Si?Ge filler metals drops from 592 to 519 °C as the content of Ge increases from 0 to 30% (mass fraction). As the content of Ge increases, bright eutectic Ge forms. However, as the Ge content exceeds 20%, the aggregation growth of the eutectic structure tends to happen and coarsened primary Si?Ge particle forms, which is detrimental to the properties of alloys. The Al?10.8Si?10Ge filler metal has good processability and wettability with the base metal Al. When this filler metal is used to braze 1060 aluminum, the complete joint can be achieved. Furthermore, the shear strength test results show that the fracture of brazed joint with Al?10.8Si?10Ge filler metal occurs in the base metal. 展开更多
关键词 Al-Si-Ge filler microstructure brazed joint shear strength 1060 aluminum
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New filler metal systems for the brazing of titanium alloys
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作者 V. F. Khorunov S. V. Maksymova V. V. Voronov 《China Welding》 EI CAS 2015年第3期1-5,共5页
It' s well known welding takes the leading role in development of titanium structures. However, in number of cases technological processes of brazing are more appropriate and, sometimes, being the single possible, in... It' s well known welding takes the leading role in development of titanium structures. However, in number of cases technological processes of brazing are more appropriate and, sometimes, being the single possible, in particular, during production of multilayer thin-wall structures. It should be noted that brazing filler metals of Ti-Cu-Ni, Ti-Zr-Cu-Ni, Zr-Ti-Ni and Cu-Zr-Ti systems in a form of plastic foils, as well as in powder form are mainly used in world practice for brazing of titanium alloys. Present work provides the results of complex investigations of brazing filler metals of Ti-Zr-Fe, Ti-Zr-Mn and Ti-Zr-Co systems using differential thermal analysis, light and scanning microscopy, X-ray microspectrum analysis. Data on melting ranges of pilot alloys were obtained, and liquidas su^Caces of given systems using simplex-lattice method were build. Brazing filler metals covering brazing temperature range of current structural titanium materials based on solid solutions as well as intermetallics were proposed. Structure, chemical inhomogeniety and strength characteristics of brazed joints were studied. It is determined that brazing of solid solution based alloys (OT4, VT6 ) using indicated brazing fiUer metals ensures strength characteristics of joints, which are not inferior to that obtained with application of known brazing filler metals even if they are received at lower brazing temperature. 展开更多
关键词 vacuum brazing titanium alloys inter-metallic alloys brazing filler metals brazed joints structure strength of brazed joints
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Direct Comparison between Tensile Strength and Flexural Strength of Ceramic/Metal Brazing Joint
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作者 冼爱平 斯重遥 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1992年第1期30-34,共5页
A design of the sandwich joint,steel/ ceramic/steel,was made for direct comparison be- tween tensile and flexural strength of ceramic/metal joint.The flexural strength is about twice as high as the tensile strength fo... A design of the sandwich joint,steel/ ceramic/steel,was made for direct comparison be- tween tensile and flexural strength of ceramic/metal joint.The flexural strength is about twice as high as the tensile strength for the same joint.The results also showed that the flexural test is more excellent than tensile test for joint with a high interracial bond strength. 展开更多
关键词 ceramic/metal brazing joint BONDING STRENGTH
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Microstructure and Property of AlN Joint Brazed with Au–Pd–Co–Ni–V Brazing Filler 被引量:2
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作者 Bo Chen Huaping Xiong +2 位作者 Yaoyong Cheng Wei Mao Shibiao Wu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2015年第10期1034-1038,共5页
An Au-Pd-Co-Ni-V brazing alloy was designed for AIN ceramic joining. Its wettability on AIN was studied with the sessile drop method. The results showed that the contact angle was decreased gradu- ally with increasing... An Au-Pd-Co-Ni-V brazing alloy was designed for AIN ceramic joining. Its wettability on AIN was studied with the sessile drop method. The results showed that the contact angle was decreased gradu- ally with increasing temperature and the prolonging of holding time. Sound AIN/AIN joints were achieved with the brazing alloy at 1170 ℃ for 10 min. The microstructure of the AIN/AIN joints was examined by scanning electron microscopy (SEM). It was found that element V played the active role in the interfacial reaction between the ceramic and the brazing alloy, V reacted with N decomposed from AIN, resulted in the formation of V-N compound. Based on the energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis results, the V-N reaction product was verified as V2N. The overall reaction during the brazing process can be described by the following equation: 2V + AIN + 2Pd = V2N + Pd2AI. The AIN/AIN joints brazed with the Au-Pd-Co-Ni-V brazing alloy exhibited three-point bend strength of 162.7 MPa at room temperature, and under the bend test the fracture of the joint occurred at the AIN ceramic substrate. 展开更多
关键词 AIN Brazing Interracial reaction Joints
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Vacuum brazing TiAl intermetallic to K4169 alloy using amorphous filler metals Ti_(56.25–x)Zr_(x)Ni_(25)Cu1_(8.75) 被引量:1
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作者 Liangliang Zhang Honggang Dong +7 位作者 Peng Li Shuai Li Baosheng Wu Yueting Ma Libing Huang Chao Li Jiachen Li Yuesen Yang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第23期217-231,共15页
A series of Ti_(56.25-x)Zr_(x)Ni_(25)Cu1_(8.75)(x=0–25,at.%) filler metals were designed based on a cluster-plus-glue-atom model to vacuum braze TiAl intermetallic to K4169 alloy. The impact of Zr content on the inte... A series of Ti_(56.25-x)Zr_(x)Ni_(25)Cu1_(8.75)(x=0–25,at.%) filler metals were designed based on a cluster-plus-glue-atom model to vacuum braze TiAl intermetallic to K4169 alloy. The impact of Zr content on the interfacial microstructure and shear strength of joints was examined. And the relationship between the interfacial lattice structure and the fracture behavior of the joint was investigated. The findings reveal a sectionalized characteristic with three reaction zones (Zone I, Zone II and Zone III) in the microstructure of the TiAl intermetallic to K4169 alloy joint. As the Zr content in filler metals increased, the diffusion of Ti transitioned from long-distance to short-distance in Zone I, changing the initial composition from TiNi_(3) /TiNi/NiNb/(Cr, Fe, Ni)SS to NiCrFe/(Cr, Fe, Ni)SS /TiNi. In Zone II, the initial composition altered from TiNi_(3) /TiNi to TiNi/Ti_(2) Ni/TiNi_(3) /TiCu/TiNi. The interface between Zones II and III altered from a non-coherent and semi-coherent interface of TiNi/TiAl/Ti_(3) Al with significant residual stress to a semi-coherent interface of TiNi/TiNi_(3) /TiAl_(2) /Ti_(3) Al with a gradient distribution. The shear strength of the joint initially decreased and then increased. When the Zr content of filler metal was 25 at.%, the shear strength of the joint reached 288 MPa. The crack initiation position changed from non-coherent TiNi/TiAl interface with high angle grain boundaries (HAGBs) and lattice mismatch of 65.86 at.% to a semi-coherent Ti3 Al/TiAl2 interface with a lattice mismatch of 20.07 at.% when the Zr content increased. The brittle fracture was present on the fracture surfaces of all brazed joints. 展开更多
关键词 Vacuum brazing TiAl intermetallic to K4169 alloy brazed joint Ti-Ni based amorphous filler metal EBSD Lattice mismatch
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Effect of Heat Input on Microstructure and Mechanical Properties of Joints Made by Bypass-Current MIG Welding–Brazing of Magnesium Alloy to Galvanized Steel 被引量:8
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作者 Yugang Miao Bintao Wu +1 位作者 Xiangfang Xu Duanfeng Han 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第6期1038-1045,共8页
Experiments were carried out with bypass-current MIG welding–brazing of magnesium alloy to galvanized steel to investigate the effect of heat input on the microstructure and mechanical properties of lap joints. Exper... Experiments were carried out with bypass-current MIG welding–brazing of magnesium alloy to galvanized steel to investigate the effect of heat input on the microstructure and mechanical properties of lap joints. Experimental results indicated that the joint efficiency tended to increase at first and then to reduce with the increase of heat input. The joint efficiency reached its maximum of about 70% when the heat input was 155 J/mm. The metallurgical bonding between magnesium alloy and steel was a thin continuous reaction layer, and the intermetallic compound layer consisted of Mg–Zn and slight Fe–Al phases. It is concluded that bypass-current MIG welding–brazing is a stable welding process, which can be used to achieve defect-free joining of magnesium alloy to steel with good weld appearances. 展开更多
关键词 Bypass-current MIG welding–brazing Dissimilar metals Joint characteristics Interface analysis
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Joining of C_f/SiBCN composite with two Ni-based brazing fillers and interfacial reactions 被引量:2
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作者 Wenwen Li Bo Chen +3 位作者 Yi Xiong Huaping Xiong Yaoyong Cheng Wenjiang Zou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2017年第5期487-491,共5页
G/SiBCN ceramic composite was joined using Ni-19Cr-10Si (BNi5) and Ni-33Cr-24Pd-3.5Si-0.5B filler alloys at 1170 ℃ for 10 min. Two kinds of Ni-based filler alloys exhibited good wettability on the CdSiBCN com- posi... G/SiBCN ceramic composite was joined using Ni-19Cr-10Si (BNi5) and Ni-33Cr-24Pd-3.5Si-0.5B filler alloys at 1170 ℃ for 10 min. Two kinds of Ni-based filler alloys exhibited good wettability on the CdSiBCN com- posite, with a contact angle of 13° and 4°, respectively, The microstructures of the brazed joints were investigated by electron-probe microanalysis (EPMA), and three-point bend test was conducted for the joints at room temperature. When being brazed with BNi5 filler alloy, no evident reaction layer was ob- served at the surface of the joined composite, and the joint microstructure was characterized by Ni2Si matrix with scatteringly distributing mixture compounds of Cr23C6, Ni2Si and CrB. While Ni-Cr-Pd(Si,B) brazing alloy was used, a Cr23C6 reaction layer with a thickness of 11 μm was formed at the surface of the base composite. In the central part of the brazed joint, the phases were composed of Ni(Cr, Si) solid solution and complex compounds including Pd2Si, (Ni,Pd)2Si and Ni-B. The strength of Cf/SiBCN joint brazed with BNi5 filler alloy was 62.9 MPa at room temperature, whereas that with Ni-Cr-Pd(Si,B) filler alloy was at the same level. 展开更多
关键词 Cf/SiBCN composite Brazing Microstructure Joint strength Interracial reaction
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Creep life assessment of aero-engine recuperator based on continuum damage mechanics approach
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作者 Pengpeng LIAO Yucai ZHANG +3 位作者 Guoyan ZHOU Xiancheng ZHANG Wenchun JIANG Shantung TU 《Frontiers of Mechanical Engineering》 SCIE CSCD 2022年第4期273-284,共12页
The creep life of an aeroengine recuperator is investigated in terms of continuum damage mechanics by using finite element simulations.The effects of the manifold wall thickness and creep properties of brazing filler ... The creep life of an aeroengine recuperator is investigated in terms of continuum damage mechanics by using finite element simulations.The effects of the manifold wall thickness and creep properties of brazing filler metal on the operating life of the recuperator are analyzed.Results show that the crack initiates from the brazing filler metal located on the outer surface of the manifold with the wall thickness of 2 mm and propagates throughout the whole region of the brazing filler metal when the creep time reaches 34900 h.The creep life of the recuperator meets the requirement of 40000 h continuous operation when the wall thickness increases to 3.5 mm,but its total weight increases by 15%.Decreasing the minimum creep strain rate with the enhancement of the creep strength of the brazing filler metal presents an obvious effect on the creep life of the recuperator.At the same stress level,the creep rupture time of the recuperator is enhanced by 13 times if the mismatch between the minimum creep rate of the filler and base metal is reduced by 20%. 展开更多
关键词 CREEP life assessment brazed joint continuum damage mechanics aeroengine recuperator
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