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Microstructural characterization and mechanical properties of aluminum 6061-T6 plates welded with copper insert plate(Al/Cu/Al) using friction stir welding 被引量:4
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作者 Vahid M.Khojastehnezhad Hamed H.Pourasl 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第3期415-426,共12页
Friction stir welding was used to join two aluminum 6061-T6 plates with an insert of a pure copper plate(Al/Cu/Al),and then the influence of the copper insert on the joint performance was studied.The dissimilar weldin... Friction stir welding was used to join two aluminum 6061-T6 plates with an insert of a pure copper plate(Al/Cu/Al),and then the influence of the copper insert on the joint performance was studied.The dissimilar welding results were also compared with AA 6061 friction stir welds produced without copper insert(Al/Al).Optical and scanning electron microscopes were used for the microstructural observations of the welded samples.X-ray diffraction analysis was used to analyze phase component of the Al/Cu/Al specimen.A defect-free joint was observed for the Al/Cu/Al joint at a rotational speed of 950 r/min and a welding speed of 50 mm/min.Microstructural observation of the weld nugget zone(WNZ)demonstrates the formation of composite-like structure which promotes metallurgical bonding of aluminum and copper.XRD results show the formation of intermetallic compounds(IMCs),such as Al4Cu9 and Al2Cu.Furthermore,it was observed that the hardness of the weld with the Cu insert plate is higher than that of other samples due to more dislocation density and a distinct rise in hardness values was observed due to the presence of IMCs.The ultimate tensile strength of the joint with copper insert plate is higher than that of the other sample due to the strong metallurgical bonding between Al and Cu. 展开更多
关键词 friction stir welding al/cu/al intermetallic compounds microstructure mechanical properties
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Effect of process parameters on interfacial microstructure and mechanical properties of Al/Cu friction stir lap welding joints 被引量:1
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作者 Wang Chenji Liu Song +2 位作者 Zhu Hao Cao Zhilong Dong Shaokang 《China Welding》 CAS 2022年第4期48-58,共11页
In this study,friction stir lap welding(FSLW)was performed for the welding test of 6061 aluminium alloy and T2 pure copper.The effect of process parameters containing rotation rate and travel speed on interfacial micr... In this study,friction stir lap welding(FSLW)was performed for the welding test of 6061 aluminium alloy and T2 pure copper.The effect of process parameters containing rotation rate and travel speed on interfacial microstructure evolution and mechanical properties of Al/Cu dissimilar joints were explored.The experiments were carried out under the rotation rates of 600,900 and 1200 r/min and with the travel speeds of 30,70 and 100 mm/min.The characteristic of interface transition zones(ITZs)and the species of intermetallic compounds(IMCs)were investigated.The Al/Cu interface showed a layered structure composed of Al-Cu IMCs,which will affect the mechanical property.The layer consisting of Al2Cu was formed at lower heat input,and as heat input increased the Al4Cu9 phase started to form.Excessive heat input will increase the thickness of the interface and raise the brittleness of the joints.The thickness of the IMCs layers changed from0.89μm to 3.96μm as the heat input increased.The maximum value of tensile shear loading of 4.65 kN was obtained at the rotation rate of900 r/min and travel speed of 100 mm/min with the interface thickness of 2.89μm.The fracture mode of the joints was a mix of ductile and brittle fracture. 展开更多
关键词 friction stir lap welding al/cu dissimilar welding intermetallic compounds process parameters mechanical properties
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热场辅助电磁脉冲焊接Al/Cu异种金属接头组织性能研究
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作者 陈玉华 吴鸿燕 +3 位作者 周春培 贾立超 沈文龙 谢吉林 《电焊机》 2023年第8期16-21,共6页
采用热场辅助电磁脉冲焊接技术对Al/Cu异种金属进行焊接,对比分析了热场温度分别为室温、100℃和200℃条件下焊接接头的宏观形貌、界面组织及力学性能。结果表明:热场辅助电磁脉冲焊接技术能够实现Al/Cu异种金属的优质焊接;随着热场温... 采用热场辅助电磁脉冲焊接技术对Al/Cu异种金属进行焊接,对比分析了热场温度分别为室温、100℃和200℃条件下焊接接头的宏观形貌、界面组织及力学性能。结果表明:热场辅助电磁脉冲焊接技术能够实现Al/Cu异种金属的优质焊接;随着热场温度的增加,焊接接头有效结合区的尺寸增大。而波状界面形貌随着热场温度不同呈现不同的形态,室温下界面呈现正弦波和剪切波的混合波形,100℃下呈不规则的嵌入式波形形貌,200℃下的形貌与室温类似,但是界面反应层的厚度最大;三种温度下的界面反应区都检测到了Al-Cu化合物的存在。力学性能测试结果表明,随着热场温度的升高,焊接接头的力学性能逐渐提高。当加热温度为200℃时,焊接接头的抗拉剪力达到了4076 N;所有试样都在界面处发生断裂,断裂区域存在断口形貌呈现“河流状”和韧窝结构混合形式,推断焊接接头的失效模式为韧脆混合断裂。在外场温度作用下,焊接接头的有效结合区增大,界面波形结构发生改变,进而有效地提升了接头的力学性能。 展开更多
关键词 电磁脉冲焊接 热场辅助 al/cu异种金属 微观组织 力学性能
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Al-Cu-Li合金电子束填丝焊接头显微组织与力学性能 被引量:1
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作者 江恒 王少刚 张文 《焊接技术》 2023年第11期51-57,I0002,共8页
采用ER4043焊丝作为填充材料,对厚度为2 mm的Al-Cu-Li合金进行电子束填丝焊,分析测试接头的显微组织与力学性能。在电子束焊过程中,Al-Si焊丝的添加可明显改善焊缝成形和接头质量。微观分析显示,接头焊缝区沿熔合线分布细小的等轴晶,熔... 采用ER4043焊丝作为填充材料,对厚度为2 mm的Al-Cu-Li合金进行电子束填丝焊,分析测试接头的显微组织与力学性能。在电子束焊过程中,Al-Si焊丝的添加可明显改善焊缝成形和接头质量。微观分析显示,接头焊缝区沿熔合线分布细小的等轴晶,熔合区主要由α(Al)基体相及T_(1)(Al_(2)CuLi),θ′(Al_(2)Cu),T(AlLiSi),β′(Al_(3)Zr),δ′(Al_(3)Li)等强化相组成。焊接时添加电子束扫描可细化焊缝晶粒,有利于提高接头的力学性能。力学性能测试表明,与母材相比,接头熔合区的显微硬度有所降低;焊接时添加方形波电子束扫描,获得接头的抗拉强度为374.7 MPa,达到母材抗拉强度的74.7%。接头拉伸断口表面分布有许多尺寸较大的等轴韧窝,呈韧-脆混合型断裂特征。 展开更多
关键词 al-cu-LI合金 电子束焊 填充焊丝 微观结构 力学性能
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Preparation of bimetallic nano-composite by dissimilar friction stir welding of copper to aluminum alloy 被引量:10
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作者 Farhad BAKHTIARI ARGESI Ali SHAMSIPUR Seyyed Ehsan MIRSALEHI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第5期1363-1380,共18页
Butt friction stir welding between pure copper and AA5754 alloy was carried out.Reinforcing SiC nanoparticles were utilized in friction stir welded(FSW)joints to decline the harmful effects of intermetallic compounds.... Butt friction stir welding between pure copper and AA5754 alloy was carried out.Reinforcing SiC nanoparticles were utilized in friction stir welded(FSW)joints to decline the harmful effects of intermetallic compounds.Tensile tests,micro-hardness experiments,scanning electron microscopy and X-ray diffraction analysis were applied to studying the properties of welded joints.The joints with a travel speed of 50 mm/min and a rotation speed of 1000 r/min showed the best results.The presence of nano-sized SiC particles reduced the grain size of aluminum and copper in the stir zone(SZ)from 38.3 and 12.4μm to 12.9 and 5.1μm,respectively.The tensile strength of the joint in the presence of reinforcing SiC nano-particles was~240 MPa,which is~90%of that for the aluminum base.Furthermore,the highest microhardness of the weld zone was significantly increased from HV 160 to HV 320 upon the addition of SiC nano-particles.The results also showed that raising the heat generation in FSW joints increased the amount of Al_(4)Cu_(9) and Al_(2)Cu intermetallic compounds. 展开更多
关键词 friction stir welding dissimilar al/cu joint SiC nano-particles intermetallic compounds microstructural characteristics mechanical properties
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Experimental and numerical investigations of interface properties of Ti6Al4V/CP-Ti/Copper composite plate prepared by explosive welding 被引量:4
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作者 Yasir Mahmood Peng-wan Chen +1 位作者 I.A.Bataev Xin Gao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第5期1592-1601,共10页
Explosive welding technique is widely used in many industries.This technique is useful to weld different kinds of metal alloys that are not easily welded by any other welding methods.Interlayer plays an important role... Explosive welding technique is widely used in many industries.This technique is useful to weld different kinds of metal alloys that are not easily welded by any other welding methods.Interlayer plays an important role to improve the welding quality and control energy loss during the collision process.In this paper,the Ti6Al4V plate was welded with a copper plate in the presence of a commercially pure titanium interlayer.Microstructure details of welded composite plate were observed through optical and scanning electron microscope.Interlayer-base plate interface morphology showed a wavy structure with solid melted regions inside the vortices.Moreover,the energy dispersive spectroscopy analysis in the interlayer-base interface reveals that there are some identified regions of different kinds of chemical equilibrium phases of CueTi,i.e.CuTi,Cu_(2)Ti,CuTi_(2),Cu_(4)Ti,etc.To study the mechanical properties of composite plates,mechanical tests were conducted,including the tensile test,bending test,shear test and Vickers hardness test.Numerical simulation of explosive welding process was performed with coupled Smooth Particle Hydrodynamic method,Euler and Arbitrary Lagrangian-Eulerian method.The multi-physics process of explosive welding,including detonation,jetting and interface morphology,was observed with simulation.Moreover,simulated plastic strain,temperature and pressure profiles were analysed to understand the welding conditions.Simulated results show that the interlayer base plate interface was created due to the high plastic deformation and localized melting of the parent plates.At the collision point,both alloys behave like fluids,resulting in the formation of a wavy morphology with vortices,which is in good agreement with the experimental results. 展开更多
关键词 Explosive welding Ti6al4V/CP-Ti/cu Smooth particle hydrodynamic(SPH) Microstructure Mechanical properties
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Microstructure and pitting corrosion resistance of AA2219 Ale Cu alloy friction stir welds e Effect of tool profile 被引量:5
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作者 Ch VENKATA RAO G.MADHUSUDHAN REDDY K.SRINIVASA RAO 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2015年第2期123-131,共9页
AA2219 Ale Cu alloy is widely used in defence and aerospace applications due to required combination of high strength-to-weight ratio and toughness.Fabrication of components used for defence always involves welding.Ev... AA2219 Ale Cu alloy is widely used in defence and aerospace applications due to required combination of high strength-to-weight ratio and toughness.Fabrication of components used for defence always involves welding.Even though the mechanical properties of the base metal are better,but the alloy suffers from poor mechanical and corrosion properties during fusion welding.To overcome the problems of fusion welding,friction stir welding(FSW) is recognized as an alternative solid state joining method aimed to improve the mechanical and corrosion properties.Tool profile is one of the important variables which affect the performance of the friction stir weld.In the present work the effect of tool profile on the microstructure and pitting corrosion of AA2219 aluminiumecopper alloy was studied.Electron backscattered diffraction results established that the grain size and orientation of weld nugget of triangle profile is finer than that of conical profile.Differential scanning calorimetric results show the evidence of precipitate dissolution during FSW.It was found that the microstructure changes,such as grain size and its orientation precipitate dissolution during FSW influence the hardness and corrosion behaviour.Pitting corrosion resistance of friction stir welds of AA2219 was found to be better for triangle profile tool compared to conical profile which is attributed to material flow and strengthening precipitate morphology in various zones.Higher amount of heat generation during FSW made using triangle profile tool may be the reason for greater dissolution of strengthening precipitates in nugget zone and coarsening in thermo mechanically affected zone(TMAZ) and heat affected zone(HAZ). 展开更多
关键词 al-cu合金 搅拌摩擦焊接 微观结构 轮廓 点蚀 摩擦搅拌焊接 电子背散射衍射 机械性能
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Physical simulation of alloying between copper and aluminum on electrode tip for resistance spot welding of 5A02 aluminum alloy
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作者 赵菲 吴志生 陈素玲 《China Welding》 EI CAS 2011年第4期46-50,共5页
The applicatio, n of aluminum alloy in the automotive and aviation fields is impeded by the wear and life of electrode for resistance spot welding (RSW). The alloying interaction between the copper electrode and alu... The applicatio, n of aluminum alloy in the automotive and aviation fields is impeded by the wear and life of electrode for resistance spot welding (RSW). The alloying interaction between the copper electrode and aluminum alloy sheet is the main reason of making electrode life decrease. The test of alloying interaction is difficult because of the transient in RSW of aluminum alloy. In this paper, the process of alloying between copper and aluminum on the electrode tip is simulated with Gleeble-1500 thermal simulation testing machine. The microstructure and composition of the sample of physical simulation for the alloying interaction between the copper electrode and aluminum alloy are analyzed using scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. The results indicate that the alloying reaction between copper and aluminum under the different temperature, pressure and time is mainly the eutectic reaction. The reaction result is the eutectic of ( Al + CuAl2 ) , and then Cu9Al4 forms through solid diffusion between the CuAl2 phase and the copper base metal. 展开更多
关键词 aluminum alloy resistance spot welding cu/al alloying physical simulation
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Cavitation Erosion Behavior of as-Welded Cu12Mn8Al3Fe2Ni Alloy
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作者 XiaoyaLI YongguiYAN +1 位作者 ZhenmingXU JianguoLI 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第3期304-306,共3页
Cavitation erosion behavior of as-welded Cu12Mn8Al3Fe2Ni alloy in 3.5% NaCl aqueous solution was studied bymagnetostrictive vibratory device for cavitation erosion. The results show that the cavitation erosion resista... Cavitation erosion behavior of as-welded Cu12Mn8Al3Fe2Ni alloy in 3.5% NaCl aqueous solution was studied bymagnetostrictive vibratory device for cavitation erosion. The results show that the cavitation erosion resistance ofthe as-welded Cu12Mn8Al3Fe2Ni alloy is much more superior to that of the as-cast one. The cumulative mass lossand the mass loss rate of the as-welded Cu12Mn8Al3Fe2Ni alloy are almost 1/4 that of the as-cast one. SEM analysisof eroded specimens reveals that the as-cast Cu12Mn8Al3Fe2Ni alloy is attacked more severely than the as-weldedone. Microcracks causing cavitation damage initiate at the phase boundaries. 展开更多
关键词 cu12Mn8al3Fe2Ni alloy Tungsten inert gas welding (TIG) Cavitation erosion
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孕育剂Ti,Zr对2219 Al-Cu合金焊缝组织及性能的影响 被引量:15
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作者 国旭明 杨成刚 +2 位作者 钱百年 徐强 张洪延 《金属学报》 SCIE EI CAS CSCD 北大核心 2005年第4期397-401,共5页
研究了焊丝中添加孕育剂Ti,Zr对2219 Al-Cu合金MIG焊缝组织和性能的影响.实验结果表明,当焊丝中Ti, Zr添加量分别为0.26%和0.33%时,整个焊缝形成了全部等轴晶组织,并且沿晶界分布的共晶相的数量减少,显著提高了焊缝 金属的抗拉强度和... 研究了焊丝中添加孕育剂Ti,Zr对2219 Al-Cu合金MIG焊缝组织和性能的影响.实验结果表明,当焊丝中Ti, Zr添加量分别为0.26%和0.33%时,整个焊缝形成了全部等轴晶组织,并且沿晶界分布的共晶相的数量减少,显著提高了焊缝 金属的抗拉强度和延伸率.在焊缝金属中, Ti,Zr以金属间铝化物质点的形式提供非均质形核的核心,促进了均匀、细小的等轴 晶粒的形成. 展开更多
关键词 孕育剂 2219 alcu合金 MIG焊缝 等轴晶
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Al/Cu扩散溶解层的形成机理研究 被引量:6
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作者 宋玉强 李世春 +1 位作者 耿相英 杨睿 《材料热处理学报》 EI CAS CSCD 北大核心 2009年第1期1-4,10,共5页
利用扫描电子显微镜和电子探针对不同退火处理的Al/Cu镶嵌式扩散偶扩散溶解层的形态和形成机理进行了研究。结果表明,当580℃保温160h退火处理后,在Al/Cu界面处形成厚度约2.5mm的扩散溶解层,其主要结构相与Al-Cu相图上相的排列位置一致... 利用扫描电子显微镜和电子探针对不同退火处理的Al/Cu镶嵌式扩散偶扩散溶解层的形态和形成机理进行了研究。结果表明,当580℃保温160h退火处理后,在Al/Cu界面处形成厚度约2.5mm的扩散溶解层,其主要结构相与Al-Cu相图上相的排列位置一致。CuAl相层首先在Cu上形成,接着CuAl2在Al上形成,然后Cu4Al3、Cu5Al3、Cu3Al2、Cu9Al4和Cu3Al等五个相层依次在Cu上形成,各个扩散溶解层按照平面式长大方式长大;Al-Cu扩散溶解层的形成是Al和Cu固相扩散、溶解与二次结晶的结果,由于扩散浓度和固溶度的相互作用,导致了扩散溶解层析出的序列性。 展开更多
关键词 扩散焊 扩散 溶解 结晶
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Cu/Al异种金属连接的研究现状 被引量:37
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作者 夏春智 李亚江 王娟 《焊接》 北大核心 2008年第1期17-20,共4页
异种金属接头由于具有优良的性能,因而在许多领域得到广泛的应用,也使得异种金属连接成为当今研究的热点,但铜铝焊接时脆性相的生成,使得铜铝接头的性能很难保证。概述了近年来国内外铜铝异种金属焊接技术的研究现状,针对钎焊和摩擦焊... 异种金属接头由于具有优良的性能,因而在许多领域得到广泛的应用,也使得异种金属连接成为当今研究的热点,但铜铝焊接时脆性相的生成,使得铜铝接头的性能很难保证。概述了近年来国内外铜铝异种金属焊接技术的研究现状,针对钎焊和摩擦焊技术做了重点介绍,分析了当前铜铝连接存在的主要困难,对于推动Cu/Al异种金属接头的研究及应用具有重要意义。 展开更多
关键词 cu/al异种金属 摩擦焊 钎焊 金属间化合物
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双脉冲MIG焊对2219Al-Cu合金焊缝组织及性能的影响 被引量:10
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作者 徐强 国旭明 +1 位作者 王宗杰 杨成刚 《热加工工艺》 CSCD 北大核心 2004年第10期3-5,共3页
研究了双脉冲MIG焊工艺对2219高强铝铜合金焊缝组织及性能的影响,通过正交试验确定了适合于2219铝铜合金焊接的最佳脉冲MIG焊工艺参数。实验结果表明,采用上述工艺参数焊接,焊缝金属中得到了大量细小的等轴晶组织,柱状晶的数量明显减少... 研究了双脉冲MIG焊工艺对2219高强铝铜合金焊缝组织及性能的影响,通过正交试验确定了适合于2219铝铜合金焊接的最佳脉冲MIG焊工艺参数。实验结果表明,采用上述工艺参数焊接,焊缝金属中得到了大量细小的等轴晶组织,柱状晶的数量明显减少,提高了焊缝金属的力学性能。 展开更多
关键词 高强al-cu合金 双脉冲MIG焊 焊缝组织
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Cu-Al爆炸焊结合层的透射电镜研究 被引量:9
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作者 周邦新 蒋有荣 《金属学报》 SCIE EI CAS CSCD 北大核心 1994年第3期B104-B108,共5页
用透射电镜(TEM)研究了Cu-Al爆炸焊的结合层,爆炸焊连接是由熔化和扩散共同作用的结果.在熔区内存在非晶态与晶态,晶态主要由CuAl_2.Cu_3Al_2和Cu_4Al组成.与熔区相邻的Al侧发生了再结晶,Cu向Al... 用透射电镜(TEM)研究了Cu-Al爆炸焊的结合层,爆炸焊连接是由熔化和扩散共同作用的结果.在熔区内存在非晶态与晶态,晶态主要由CuAl_2.Cu_3Al_2和Cu_4Al组成.与熔区相邻的Al侧发生了再结晶,Cu向Al中的扩散距离<100nm,析出针状的CuAl_2相与熔区相邻的Cu侧只发生了回复,Al向Cu中的扩散距离<100nm,形成了新相层,可能是Cu_3Al_2和Cu_4Al.在非熔化区存在Cu和Al的互扩散,形成新相层的厚度<100nm. 展开更多
关键词 爆炸焊 结合层 铜铝合金 透射电镜
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焊后热处理对Al-Mg-Si-Cu合金激光焊接接头微观结构和力学性能的影响 被引量:8
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作者 朱东晖 陈江华 +5 位作者 刘春辉 孟立春 郑雄 赖玉香 陶冠辉 顾媛 《中国有色金属学报》 EI CAS CSCD 北大核心 2015年第9期2342-2349,共8页
采用电子显微学方法和力学性能测试,探究180℃下焊后时效处理工艺对Al-Mg-Si-Cu合金激光焊接接头微观结构和力学性能的影响。结果表明:经过焊后热处理的焊件焊接接头的力学性能得到一定程度的提升,但焊缝处由于在焊接过程中形成大量的... 采用电子显微学方法和力学性能测试,探究180℃下焊后时效处理工艺对Al-Mg-Si-Cu合金激光焊接接头微观结构和力学性能的影响。结果表明:经过焊后热处理的焊件焊接接头的力学性能得到一定程度的提升,但焊缝处由于在焊接过程中形成大量的第二相颗粒,消耗了大量的溶质原子,因此,焊接接头硬度最低。对于焊前处理为欠时效的焊件,热影响区硬度经过焊后热处理后完全恢复母材硬度水平;而对于焊前处理为峰值时效和过时效的焊件,热影响区硬度不能完全恢复,会出现一个硬度谷,即软化区。通过对软化区进行透射电镜表征后发现,该区域内析出相出现明显的粗化。 展开更多
关键词 al-MG-SI-cu合金 析出相 焊后热处理 微观结构 力学性能 热影响区 软化区
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正火处理对Cu/Al爆炸焊接板显微结构及力学性能的影响 被引量:3
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作者 周国安 马宏昊 +2 位作者 沈兆武 杨明 陈佩圆 《焊接学报》 EI CAS CSCD 北大核心 2019年第6期46-51,I0003,共7页
采用爆炸焊接技术制备出以T2紫铜为覆板、1060工业纯铝为基板的T2/1060层状复合板.300℃正火处理12,24,36,48h后,对复合板结合界面的微观结构及各项力学性能进行了测试与分析.结果表明,T2/1060爆炸焊接板焊接质量良好,结合界面出现规则... 采用爆炸焊接技术制备出以T2紫铜为覆板、1060工业纯铝为基板的T2/1060层状复合板.300℃正火处理12,24,36,48h后,对复合板结合界面的微观结构及各项力学性能进行了测试与分析.结果表明,T2/1060爆炸焊接板焊接质量良好,结合界面出现规则的、幅值/宽度分别约为35μm/200μm的波形结合.正火处理48h后,两种元素在结合界面附近互相扩散明显,其扩散层的厚度、均匀程度有明显的提高;力学性能方面,试样的显微硬度、抗拉强度明显下降(分别从215HV,255.7MPa降为170HV,228.8MPa),而延展性有明显提升(屈服应变由3.64%变为22.4%). 展开更多
关键词 正火处理 爆炸焊接 铜铝合金 显微结构 力学性能
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Al-Cu-Li合金搅拌摩擦焊接头的微观组织和力学性能 被引量:3
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作者 王大勇 冯吉才 +1 位作者 刘会杰 狄欧 《中国有色金属学报》 EI CAS CSCD 北大核心 2004年第1期69-73,共5页
采用搅拌摩擦焊方法对2mm厚的Al Cu Li合金轧制板进行了焊接。接头内形成了焊核区、热机影响区和热影响区。焊核区由细等轴再结晶组织构成;热机影响区内的组织发生较大的弯曲变形,并在热循环的作用下发生了回复反应;热影响区形成了粗大... 采用搅拌摩擦焊方法对2mm厚的Al Cu Li合金轧制板进行了焊接。接头内形成了焊核区、热机影响区和热影响区。焊核区由细等轴再结晶组织构成;热机影响区内的组织发生较大的弯曲变形,并在热循环的作用下发生了回复反应;热影响区形成了粗大的板条状组织。实验结果表明:在200mm/min的焊接速度下,接头的拉伸强度最高,达到393MPa,断裂形式为韧性和脆性的混合型断裂;在500mm/min的焊接速度下,接头强度为267.7MPa,断裂形式为脆性断裂。 展开更多
关键词 al-cu-LI合金 搅拌摩擦焊 焊接接头 微观组织 力学性能
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T6处理后Al-Zn-Mg-Cu合金电子束焊接接头组织与织构的演变 被引量:2
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作者 左玉婷 孙泽明 +3 位作者 王峰 熊柏青 张永安 朱宝宏 《分析测试学报》 CAS CSCD 北大核心 2012年第9期1132-1136,共5页
采用扫描电镜、EBSD、透射电镜等方法研究了Al-Zn-Mg-Cu合金电子束焊接接头的微观组织特点,并分析了焊缝基体与熔合区在热处理前后织构的变化。结果表明,接头熔合区由尺寸约3~8μm的等轴细晶组成,析出相沿晶界均匀分布,经T6处理后熔合... 采用扫描电镜、EBSD、透射电镜等方法研究了Al-Zn-Mg-Cu合金电子束焊接接头的微观组织特点,并分析了焊缝基体与熔合区在热处理前后织构的变化。结果表明,接头熔合区由尺寸约3~8μm的等轴细晶组成,析出相沿晶界均匀分布,经T6处理后熔合区的晶粒尺寸无明显变化,晶界变细,沿晶界分布的连续析出相溶解,残余孤立的MgZn2析出相,尺寸约1~2μm。基体主要织构为<111>和<001>丝织构,经T6(固溶时效)处理后,两种织构的含量无明显变化,织构强度略有下降,焊缝熔合区无明显的织构。 展开更多
关键词 电子束焊接 al-ZN-MG-cu合金 织构
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Al-Cu-Mg硬铝合金TIG焊焊接接头的组织与力学性能 被引量:8
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作者 刘政军 刘继国 苏允海 《沈阳工业大学学报》 EI CAS 北大核心 2015年第6期629-633,共5页
为了研究Al-Cu-Mg硬铝合金TIG焊焊接接头的组织与力学性能,采用ER4043焊丝对2A12硬铝合金进行了焊接实验.利用光学显微镜、扫描电子显微镜、透射电子显微镜、能谱分析仪和硬度计对Al-Cu-Mg硬铝合金的组织和力学性能进行了表征.结果表明... 为了研究Al-Cu-Mg硬铝合金TIG焊焊接接头的组织与力学性能,采用ER4043焊丝对2A12硬铝合金进行了焊接实验.利用光学显微镜、扫描电子显微镜、透射电子显微镜、能谱分析仪和硬度计对Al-Cu-Mg硬铝合金的组织和力学性能进行了表征.结果表明,焊缝的强度和塑性较低,焊缝边缘为柱状晶,中心为枝晶组织,晶界存在大量低熔点共晶体.近缝区存在明显的晶界液化现象,晶粒为圆润的等轴晶,焊缝的硬度大幅度下降.固溶区焊缝的硬度和母材相近,基体中存在大量的针状S'相,可对该区域起到强化作用.过时效区基体软化现象比较严重,存在很多S(Al2Cu M g)相. 展开更多
关键词 al-cu-Mg硬铝合金 焊接接头 显微组织 力学性能 晶界液化 低熔点共晶 过时效 固溶强化
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焊接速度及焊后时效处理对Al-Cu-Mg-Ag合金电子束焊接接头性能的影响 被引量:2
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作者 李俊霖 刘志义 +2 位作者 泊松 王建 应普友 《矿冶工程》 CSCD 北大核心 2017年第3期144-147,共4页
通过拉伸测试、扫描电镜(SEM)、能谱分析(EDS)、透射电镜(TEM)和金相显微镜(OM)等手段,研究了焊接速度以及焊后时效处理对Al-Cu-Mg-Ag合金电子束焊接接头性能的影响。结果表明:随焊接速度提高,焊接接头强度呈先上升后下降的趋势,并在焊... 通过拉伸测试、扫描电镜(SEM)、能谱分析(EDS)、透射电镜(TEM)和金相显微镜(OM)等手段,研究了焊接速度以及焊后时效处理对Al-Cu-Mg-Ag合金电子束焊接接头性能的影响。结果表明:随焊接速度提高,焊接接头强度呈先上升后下降的趋势,并在焊接速度1 200 mm/min时获得最大值358 MPa;焊后时效处理可以提升焊接接头抗拉强度,其中焊接速度为1 200 mm/min时的焊接接头抗拉强度最大,可达412 MPa,为母材强度的77.6%。焊后时效合金性能的提高主要得益于θ'和X相的析出,而焊缝熔合区晶界处Cu元素的偏析抑制了Ω相的析出。 展开更多
关键词 al-cu-MG-AG合金 电子束焊接 焊接速度 时效处理 X相 焊接接头
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