scholarly journals Effect of Welding Wires Containing ZrB2 Particles on Microstructure and Mechanical Properties of Spray-Formed 7055 Aluminum Alloy TIG Welded Joints

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ting Huang ◽  
Junhua Xu ◽  
Lihua Yu ◽  
Yunxuan Hu ◽  
Yun Cheng ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Welded Joint ◽  
Testing Machine ◽  
Weld Zone ◽  
Tensile Testing Machine ◽  
Hardness Tester ◽  
7055 Aluminum Alloy

In this paper, a series of welding wires with ZrB2 particles were developed by the in situ reaction, and the ZrB2 particles were successfully introduced into the spray-formed 7055 aluminum alloy welded joints by TIG welding. The microstructure, hardness, and tensile strength of the welded joints were tested by metallographic microscope, SEM, EDS, Vickers hardness tester, and tensile testing machine. The results show that the microstructure of ZrB2/7055 welded joints is fine dendrites. The hardness of the weld zone of the ZrB2/7055 welded joint is higher than that of the 7055 welded joint. With the increase of ZrB2 particles’ content, the tensile strength of welded joints increases first and then decreases. When the content of ZrB2 particles is 1.5 wt.%, the tensile strength reaches the maximum value of 280 MPa. The tensile strength of the welded joint containing 1.5 wt.% ZrB2 particles is 14% higher than that of the pure 7055 aluminum alloy welded joint.

scholarly journals Improving the Properties of Laser-Welded Al–Zn–Mg–Cu Alloy Joints by Aging and Double-Sided Ultrasonic Impact Compound Treatment

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2742
Author(s):  
Furong Chen ◽  
Chenghao Liu
Keyword(s):  
Plastic Deformation ◽  
Tensile Strength ◽  
Tensile Properties ◽  
Welded Joints ◽  
Welded Joint ◽  
Weld Zone ◽  
Aging Treatment ◽  
Residual Tensile Stress ◽  
Impact Surface ◽  
Deformation Layer

To improve the loose structure and serious porosity of (Al–Zn–Mg–Cu) 7075 aluminum alloy laser-welded joints, aging treatment, double-sided ultrasonic impact treatment (DSUIT), and a combination of aging and DSUIT (A–DSUIT) were used to treat joints. In this experiment, the mechanism of A–DSUIT on the microstructure and properties of welded joints was analyzed. The microstructure of the welded joints was observed using optical microscopy, scanning electron microscopy, and electron backscatter diffraction (EBSD). The hardness and tensile properties of the welded components under the different processes were examined via Vickers hardness test and a universal tensile testing machine. The results showed that, after the aging treatment, the dendritic structure of the welded joints transformed into an equiaxed crystal structure. Moreover, the residual tensile stress generated in the welding process was weakened, and the hardness and tensile strength were significantly improved. After DSUIT, a plastic deformation layer of a certain thickness was generated from the surface downward, and the residual compressive stress was introduced to a certain depth of the joint. However, the weld zone unaffected by DSUIT still exhibited residual tensile stress. The inner microhardness of the joint surface improved; the impact surface hardness was the largest and gradually decreased inward to the weld zone base metal hardness, with a small improvement in the tensile strength. Compared with the single treatment process, the microstructural and mechanical properties of the welded joint after A–DSUIT were comprehensively improved. The microhardness and tensile strength of the welded joint reached 200 HV and 615 MPa, respectively, for an increase of 45.8% and 61.8%, respectively. Observation of the fractures of the tensile specimens under the different treatment processes showed that the fractures before the aging treatment were mainly ductile fractures while those after were mainly brittle fractures. After DSUIT of the welded joints, a clear and dense plastic deformation layer was observed in the fracture of the tensile specimens and effectively improved the tensile properties of the welded joints. Under the EBSD characterization, the larger the residual compressive stress near the ultrasonic impact surface, the smaller the grain diameter and misorientation angle, and the lower the texture strength. Finally, after A–DSUIT, the hardness and tensile properties improved the most.

Influence of Stress Concentration on Fatigue Property of Welded Joints of 5083 Aluminum Alloy

2013 ◽  
Vol 456 ◽  
pp. 451-455
Author(s):  
Jun Yang ◽  
Bo Li ◽  
Qiang Jia ◽  
Yuan Xing Li ◽  
Ming Yue Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Welded Joints ◽  
Weld Zone ◽  
Fatigue Property ◽  
Concentration Coefficient ◽  
5083 Aluminum Alloy ◽  
Stress Concentration Coefficient

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

Effect of Iron Content on the Strength and Conductivity of Cu-Fe In Situ Composite

2014 ◽  
Vol 633-634 ◽  
pp. 63-67
Author(s):  
Ke Ming Liu ◽  
Z.Y. Jiang ◽  
Yong Hua Wang ◽  
Z.B. Chen ◽  
Jing Wei Zhao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Cold Deformation ◽  
Testing Machine ◽  
Optical Microscope ◽  
Good Combination ◽  
Mechanical Processing ◽  
Tensile Testing Machine ◽  
In Situ Composite

Cu-14Fe and Cu-17Fe alloys were produced by casting and processed into in situ composites by hot and cold deformation, and intermediate heat treatment. The microstructures were investigated by using a scanning electron microscope and an optical microscope. The electrical conductivity was evaluated by using a digital micro-ohmmeter. The tensile strength was measured by using an electronic tensile-testing machine. The results show that there are similar cast and deformation microstructures in Cu-14Fe and Cu-17Fe. The tensile strength of deformation-processed Cu-17Fe in situ composite is much higher than that of Cu-14Fe, while the conductivity of deformation-processed Cu-17Fe in situ composite is slightly lower than that of Cu-14Fe at the same cold deformation strain. The Cu-17Fe in situ composite produced by using proper thermo-mechanical processing possesses a good combination of tensile strength and electrical conductivity.

Effect of Coarse-Grained Ring on Mechanical Properties and Cutting Performance of 2011 Aluminum Alloy Extruded Bar

2021 ◽  
Vol 1035 ◽  
pp. 114-118
Author(s):  
Chang Liang Shi ◽  
Yan Ping Niu ◽  
Yi Min Lin ◽  
Quan Hu ◽  
Xin Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Tensile Testing ◽  
High Speed ◽  
Testing Machine ◽  
Eutectic Phase ◽  
Cutting Performance ◽  
Coarse Grained ◽  
Tensile Testing Machine

The effects of coarse-grained ring on the mechanical properties and cutting performance of 2011 aluminum alloy extruded bars were studied by metallographic microscope, scanning electron microscope, tensile testing machine and high-speed lathe. The results show that the microstructure of aluminum alloy extruded bar was composed of α-Al phase, Al7Cu2Fe phase, CuAl2 phase and SnBi eutectic phase. There was a coarse-grained ring in the aluminum alloy extruded bar. The coarse-grained ring reduced the mechanical properties and cutting performance of the aluminum alloy extruded bar. The aluminum alloy extruded bar with a diameter of 30 mm had a coarse-grained ring depth of 9 mm and lower mechanical properties, whose the tensile strength was 287.9 MPa, the elongation was 17%, the cutting performance was poor and the chips were long. The aluminum alloy extruded bar with a diameter of 40 mm had a coarse-grained ring depth of 1 mm, higher mechanical properties and better cutting performance, whose the tensile strength was 394.5 MPa, the elongation was 23.5%, the chips were fine and uniform.

Morphological and Mechanical Characteristics of Hybrid Aluminium Matrix Composites

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
R. Pugazhenthi ◽  
S. Sivaganesan ◽  
C. Dhansekaran ◽  
A. Parthiban
Keyword(s):  
Tensile Strength ◽  
Smart Materials ◽  
Aluminium Alloys ◽  
Testing Machine ◽  
Morphological Characteristics ◽  
Stir Casting ◽  
Matrix Composites ◽  
Tensile Testing Machine ◽  
Hardness Tester ◽  
Silicon Carbide Particles

In emerging trend day by day the world facing lot of new invention in automobiles and aerospace industries. They need new smart materials lighter in weight, tensile strength and hardness with good thermal shock resistance compared to available conventional metals. Especially the aluminium based Metal Matrix Composite (MMC) materials can provide these properties. In this research article an attempt is made to find the mechanical properties and morphological of the aluminium alloys of Al 356 mixed with silicon carbide particles (SiCp) and Mica. All these three different MMCs were fabricated in stir casting method. Their tensile strengths are studied and compared with the help of Vickers micro hardness tester and tensile testing machine. The morphological characteristics are tested and compared with the Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDAX) optical microscopy. The tensile strength and hardness of MMCs were comparatively increased than the aluminium alloys.

Microstructure and Properties of Deformation-Processed Cu–Cr In Situ Composites

2013 ◽  
Vol 690-693 ◽  
pp. 329-333
Author(s):  
Ke Ming Liu ◽  
Z.B. Chen ◽  
Jin Zou ◽  
Shi Yong Wei ◽  
Qiang Hu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Cold Deformation ◽  
Testing Machine ◽  
Good Combination ◽  
Tensile Testing Machine ◽  
In Situ Composite ◽  
Deformation And Heat Treatment ◽  
Electronic Microscope

Cu-11Cr alloy was prepared by casting and processed into an in situ composite by cold deformation and heat treatment. The microstructure, strength and conductivity were investigated by scanning electronic microscope, tensile-testing machine and micro-ohmmeter. The results suggested that the initially randomly distributed Cr dendrites in the as-cast Cu-11Cr alloy were transformed into Cr fibres aligned parallel to the drawing axis in the deformation-processed in situ composite; the tensile strength and the resistivity increased with increasing cold deformation strain. The good combination of strength and conductivity of the deformation-processed Cu-11Cr in situ composite was achieved by using the proper cold deformation and heat treatment. At η = 8, the tensile strength and conductivity reached 823 MPa and 71.9 %IACS, respectively.

Effect of Micro-Alloyed Treatment for 5183 Welding Wire on Microstructure and Tensile Property of Welded Joint

2014 ◽  
Vol 633-634 ◽  
pp. 821-825
Author(s):  
Xiao Ming Wang ◽  
Sheng Zhu ◽  
Zhi Hao Zhao ◽  
Qi Wei Wang ◽  
Xiao Dong Zhao
Keyword(s):  
Tensile Strength ◽  
Tensile Property ◽  
Welded Joint ◽  
Testing Machine ◽  
Optical Microscope ◽  
Welding Wire ◽  
Tensile Testing Machine ◽  
7A52 Aluminum Alloy ◽  
Refined Microstructure ◽  
Specific Elongation

5183 welding wire micro-alloyed using Sc, Zr, Er and automatic MIG welding system applied to weld 7A52 aluminum alloy. Optical microscope and universal tensile testing machine utilized to investigate microstructure and tensile property of welded joint, respectively. The results indicated that welded zone and fused zone was composed of uniform isometric crystal and tiny isometric dendrite crystal when the welded joint was fabricated by using 5183 welding wire micro-alloyed via rare earth element, respectively. Tensile strength and specific elongation of welded zone was improved utmostly when the 5183 welding wire micro-alloyed treatment via single Sc or Zr, respectively. Owing to mirco-alloyed treatment of 5183 welding wire by using Sc, Zr or Er, a large number of Al3Sc, Al3Zr, Al3Er granules had generated in micro-poll, which played heterogeneous nucleation role and refined microstructure of welded zone. Meanwhile, there emerged nanoscaled A13Sc, A13Zr, Al3Er strengthening phase dispersed in welded zone, which had led welded joint to exhibit exclent tensile strength.

Tensile Properties of 15wt. %TiB2/7055 Composite Fabricated by In Situ Method

2013 ◽  
Vol 842 ◽  
pp. 165-169 ◽  
Author(s):  
Dong Chen ◽  
Cong Zou ◽  
Yi Jie Zhang ◽  
Nai Heng Ma ◽  
Hao Wei Wang
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Elastic Modulus ◽  
Ultimate Tensile Strength ◽  
Tensile Properties ◽  
Matrix Alloy ◽  
In Situ Method ◽  
The Matrix ◽  
7055 Aluminum Alloy

7055 aluminum alloy reinforced with 15wt. % TiB2 particulates was synthesized by in situ method, the microstructure and tensile properties were investigated. There are a few particulate clusters in the matrix. The elastic modulus and hardness of the composite are higher than that of the matrix alloy, but the yield strength and ultimate tensile strength decrease. The decrease of strength is attributed to the presence of TiB2 particulate cluster and residual reaction slag.

Increase of the Elasticity and Strength of the Welded Joints for the Al-Mg-Li Alloy Made by the Laser Welding by Means of the Thermal Mechanical Processing

2018 ◽  
Vol 385 ◽  
pp. 385-390
Author(s):  
Aleksandr Malikov ◽  
Anatolii Orishich ◽  
Evgenij Karpov ◽  
Evgenij Sandalov
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Thermal Processing ◽  
Mechanical Characteristics ◽  
Welded Joint ◽  
Strength Increase ◽  
Artificial Ageing ◽  
Mechanical Processing ◽  
Before And After

The paper deals with the analysis of the effect of the thermal mechanical processing on the mechanical characteristics (elasticity and tensile strength) of the welded joints of the aluminum alloy, the system Al-Mg-Li. The microstructures of the basic alloy and welded joint before and after the thermal processing are compared by electronic microscoping. The X-ray diffraction method is used to compare the phase composition. The concentration of the strengthening phase δʹ(Al3Li) reduces in the welded joint, which results in the low mechanical characteristics. The thermal processing, namely quenching, increases the concentration of the equilibrium S1 phase (Al2MgLi) in the welded joint as compared with an unquenched joint. The elasticity of the welded joint rises significantly at the almost constant strength, the value of the relative extension lies within the range of 2.4 – 19.2 % before and after quenching, respectively. Artificial ageing applied to the welded joint after the quenching gives the structurization of the S1 phase. The full thermal mechanical processing (quenching, elastic deformation, artificial ageing) of the welded joint of the aluminum alloy (the system AL-Mg-Li) results in the tensile strength increase up to 0.95 of the basic alloy strength.

Effects of La and Ce Mixed Rare Earth on Microstructure and Properties of Al-Mg-Si Aluminum Alloy

2017 ◽  
Vol 898 ◽  
pp. 367-371 ◽  
Author(s):  
Shun Cheng Wang ◽  
Nan Zhou ◽  
Dong Fu Song ◽  
Deng Nong
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Rare Earth ◽  
Eddy Current ◽  
Tensile Testing ◽  
Testing Machine ◽  
Tensile Testing Machine ◽  
Microstructure And Properties ◽  
Positive Effect

The effects of La and Ce mixed rare earth on the microstructure and properties of Al-0.75Mg-0.6Si alloy were studied by optical microscopy, digital eddy current conductive instrument and tensile testing machine. Results showed that the addition of La and Ce mixed rare earth had a positive effect on the grain refinement of Al-0.75Mg-0.6Si alloy, which is beneficial to improve the electrical conductivity and strength. With increasing the additive amount of La and Ce mixed rare earth, the electrical conductivity, tensile strength and elongation of Al-0.75Mg-0.6Si alloy gradually increased. When the additive amount of La and Ce mixed rare earth increased to 0.5%, the electrical conductivity of Al-0.75Mg-0.6Si alloy was 55.7% IACS, the tensile strength and elongation of Al-0.75Mg-0.6Si alloy were 236 MPa and 16.7%, respectively. The electrical conductivity increased by 5.7%, tensile strength and elongation increased by 11.3% and 15.2% compared with that of Al-0.75Mg-0.6Si alloy without adding the La and Ce mixed rare earth.

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