Formation and Distribution Mechanism of Intermetallic Compounds of Al/Mg Joint with Zn Transition Metal

2014 ◽  
Vol 597 ◽  
pp. 276-279
Author(s):  
Qiong Gao ◽  
Ke Hong Wang ◽  
Heng Ma ◽  
Wei Guo Feng
Keyword(s):  
Mechanical Property ◽  
Solid Solution ◽  
Transition Metal ◽  
Weld Seam ◽  
Welding Process ◽  
Al Alloy ◽  
6061 Al Alloy ◽  
Relationship Of ◽  
The Relationship ◽  
Microstructure And Mechanical Property

6061 Al alloy and AZ31B Mg alloy were joined by lapping TIG welding process with Zn transition metal. The formation and distribution mechanism of IMCs of Al/Mg joint, and the relationship of microstructure and mechanical property were discussed. The introduction of Zn transition metal reduces the Mg/Al IMCs effectively. The microstructure in the fusion zone near the Mg substrate composes of three regions. B zone contains of only MgZn2 IMCs. That is the place of highest micro-hardness in the weld seam. A and C zones characterize with solid solution precipitated on the MgZn2 basement which can enhance the ductility of Mg/Al joint. This result indicates that increasing the solid solution precipitated on IMCs can improve the mechanical property of Mg/Al joint.

Flow Stress of 6061 AL Alloy Composites

1968 ◽  
Vol 90 (2) ◽  
pp. 292-294
Author(s):  
L. B. Gulbransen
Keyword(s):  
Flow Stress ◽  
Fiber Reinforced Composites ◽  
Al Alloy ◽  
Similar Relationship ◽  
Reinforced Composites ◽  
Two Phase ◽  
6061 Al Alloy ◽  
Relationship Of ◽  
The Relationship ◽  
Alloy Systems

The relationship of flow stress to the interparticle path of two phase alloy systems is discussed and the similarity of two phase alloy systems to wire or fiber reinforced composites is described. Experiments were performed on iron wire reinforced 6061 aluminum alloys which show that the flow stress in these systems can be expressed by a similar relationship as documented for two phase alloy systems, namely, σflow = C1 log λ + C2, where C1 and C2 are constants, σflow is the flow stress, and λ is the interwire spacing within 4, 6, and 8 wire aluminum alloy composites.

Effects of Nd on the Microstructure and Mechanical Property of ZA52 Alloy

2005 ◽  
Vol 488-489 ◽  
pp. 161-164
Author(s):  
Honghui Zou ◽  
Xiao Qing Zeng ◽  
Chun Quan Zhai ◽  
Wen Jiang Ding
Keyword(s):  
Mechanical Property ◽  
Grain Boundary ◽  
Tensile Test ◽  
Total Elongation ◽  
Al Alloy ◽  
Nd Addition ◽  
A Priority ◽  
Property Changes ◽  
Microstructure And Mechanical Property

Microstructure and mechanical property changes brought by the addition of Nd element in Mg-5wt%Zn-2wt%Al alloy are investigated, results show Al element takes a priority to react with Nd element over Mg and Zn, forming binary phases Al2Nd or Al11Nd3, tensile test showed that the total elongation is improved by the addition of Nd, and the UTS is also elevated when the Nd content surpass 1wt%. With a larger Nd addition, the phase dominating grain boundary is Al11Nd3 phase.

Investigation of Microstructure and Mechanical Property of the Machinable B4C/BN Composites Fabricated by Hot-Pressing Process

2011 ◽  
Vol 415-417 ◽  
pp. 335-338
Author(s):  
Tao Jiang
Keyword(s):  
Mechanical Property ◽  
Phase Composition ◽  
Chemical Reaction ◽  
Hot Pressing ◽  
Weak Interface ◽  
Pressing Process ◽  
Sem And Tem ◽  
Xrd Patterns ◽  
The Relationship ◽  
Microstructure And Mechanical Property

The B4C/BN composites were fabricated by hot-pressing process in this research. The B4C/BN composites included the B4C/BN microcomposites and the B4C/BN nanocomposites. The B4C/BN microcomposites were fabricated by hot-pressing process, and the B4C/BN nanocomposites were fabricated by chemical reaction and hot-pressing process. In this research, the phase composition, microstructure, mechanical property and machinability of the B4C/BN microcomposites and B4C/BN nanocomposites were investigated. The XRD patterns results showed that there existed B4C phase and h-BN phase in the hot-pressed composites. The microstructure of the B4C/BN composites was investigated by SEM and TEM. The B4C/BN microcomposites and the B4C/BN nanocomposites sintered bulks exhibited the homogenous and compact microstructure, and the h-BN particles were homogenously distributed in the B4C matrix. The mechanical property of the B4C/BN microcomposites and the B4C/BN nanocomposites decreased gradually with the increase of h-BN content. The mechanical property of the B4C/BN nanocomposites was remarkably improved in comparison with the B4C/BN microcomposites. The machinability of the B4C/BN microcomposites and the B4C/BN nanocomposites increased gradually with the increase of h-BN content, the drilling rates of the B4C/BN composites specimens increased gradually with the increase of h-BN content. The relationship between the microstructure and machinability of the B4C/BN composites was analyzed. The microstructure showed that the weak interface of B4C/BN and cleavage behavior of laminate structured h-BN particles remarkably improved the machinabilty of B4C/BN composites.

scholarly journals Analysis of the coefficient of linear relationship, generated by the exponential heating during the welding process for an A36 steel plate

2021 ◽  
pp. 16-21
Author(s):  
Mario Barrera-Moreno ◽  
Rumualdo Servin-Castañeda ◽  
Ismael Calderon-Ramos ◽  
Alejandro Perez-Alvarado
Keyword(s):  
Heat Transfer ◽  
Steel Plate ◽  
Welding Process ◽  
High Hardness ◽  
Metal Plate ◽  
Filler Material ◽  
A36 Steel ◽  
Welding Sequences ◽  
Relationship Of ◽  
The Relationship

The present study presents the relationship of temperature and deformation as well as the analysis of heat transfer and deformation produced during welding of a steel plate. The method consists of strategically welding a base metal plate (A-36) with a high-hardness filler material to obtain an overall increment in wear resistance. However, the thermal cycles generated during welding produced deformation, thus changing the flatness of the plate. Different sequences of welding were applied to obtain a relationship between the heat transfer and deformation. A filler material was applied to 100 holes (1/2” diameter and 8 mm depth) in a ½” steel plate. The temperature and deformation were measured for 3 different welding sequences. Plate 1 reached a final mean temperature of 467 °C and deformation of 0.016”, plate 2 reached 472.9 °C and -0.008”, and plate 3 reached 354.2 °C and 0.020”. The results indicate that the deformation is not function of the final temperature, instead the deformation is function of the slope of the curve temperature vs deformation. The behavior of the curve temperature vs deformation is linear for all cases studied, confirming the findings of the lowest deformation for plate 2 which exhibited the lowest slope.

Introduction

2021 ◽  
pp. 3-30
Author(s):  
Gang Cao ◽  
Lance E. DeLong
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Quantum States ◽  
Spin Orbit ◽  
Crystalline Electric Field ◽  
Topological States ◽  
Coulomb Correlations ◽  
Relationship Of ◽  
The Relationship

The fundamental and technological importance of transition metal oxides, and the relationship of the present work to previous monographs dealing with transition metal oxides are reviewed. The relatively abundant 3d-transition metal oxides are contrasted with the rarer 4d- and 5d-transition metal oxides that exhibit a unique interplay between spin-orbit, exchange, crystalline electric field and Coulomb correlations. The combined effect of these fundamental interactions yields peculiar quantum states and empirical trends that markedly differ from those of their 3d counterparts. General trends in the electronic structure are related to generalized phase diagrams of the magnetic and insulating ground states. The intriguing absence of experimental evidence for predicted topological states and superconductivity in these materials are discussed.

Investigation of a hot-pressed Nb–Ti–Al alloy: Mechanical alloying, microstructure and mechanical property

2016 ◽  
Vol 651 ◽  
pp. 869-877 ◽  
Author(s):  
Zhiwu Shi ◽  
Hua Wei ◽  
Hongyu Zhang ◽  
Tao Jin ◽  
Xiaofeng Sun ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Mechanical Alloying ◽  
Al Alloy ◽  
Microstructure And Mechanical Property

Effect of Porosity on Residual Stress of 2024-Aluminum GTAW Specimen

2016 ◽  
Vol 872 ◽  
pp. 28-32 ◽  
Author(s):  
Pattarawadee Poolperm ◽  
Wasawat Nakkiew
Keyword(s):  
Residual Stress ◽  
Aluminum Alloys ◽  
Welding Speed ◽  
Fatigue Crack Initiation ◽  
Welding Process ◽  
The Body ◽  
Tensile Residual Stress ◽  
Welding Parameters ◽  
Relationship Of ◽  
The Relationship

Aluminum alloys are used widely in many applications due to its low in density which can lead to a lightweight product. A high percentage of Cu in the chemical composition of the 2024 aluminum alloys helps withstand the occurrence of corrosion as well. Thus, aluminum alloy grade 2024 is used as a material for several parts in aircraft and spacecraft components, (e.g. the body of commercial airplanes), as well as parts in many other applications. Gas Tungsten Arc Welding (GTAW) is used widely in joining material parts together. Inappropriate welding parameters usually cause problems such as porosity in the welding. The occurrence of porosity is undesirable in welding because it can affect the strength of the welding area as well as other properties. Tensile residual stress near the surface of the material expedites the fatigue crack initiation. The relationship of porosity and residual stress for GTAW parts was very limited in literatures. Therefore, the objective of this research was to investigate the relationship of porosity to the occurrence of residual stress after the welding process. Full factorial design of experimental technique was used for setting up welding conditions of the GTAW. The specimen with highest porosity was selected for further analysis of its effect on residual stress. Porosity was analyzed by the radiographic testing (RT) and the residual stress was measure by X-ray diffraction (XRD) using sin2 method. The results showed that the highest porosity in the welded bead was found at the current of 130 A, the welding speed of 210 mm./min., and the wire feed rate of 700 mm./min. The results also suggested that lower current and welding speed caused an increase in porosity. The residual stress results on both longitude and transverse directions showed tensile residual stress at locations around the welded bead area.

Study on DC Double Pulse MIG Welding of Automobile Aluminum Alloy

2011 ◽  
Vol 295-297 ◽  
pp. 1933-1937 ◽  
Author(s):  
Zhao Dong Zhang ◽  
Xiang Yu Kong
Keyword(s):  
Base Metal ◽  
Thin Sheet ◽  
Welding Process ◽  
Weld Bead ◽  
Double Pulse ◽  
Transfer Model ◽  
Al Alloy ◽  
Mig Welding ◽  
6061 Al Alloy ◽  
Better Than

In this paper, the features of weld formation, porosity, arc behavior, microstructure and mechanical properties of 6061 Al alloy thin sheet welds by direct current (DC) double pulse metal inert gas (MIG) welding process are investigated and compared with the traditional DC MIG welding process. Results show that continuous one-side welding with back forming weld beads without spatters, undercuts or cracks can be obtained by using the DC double pulse MIG welding process. The porosity of weld bead can be largely reduced by using the process. The arc of DC double pulse MIG welding is stable without arc blowout, and the metal transfer model of DC double pulse MIG welding is better than that of DC MIG welding. Microstructure of the weld bead by DC double pulse MIG welding shows a dendrite structure and it is fine and uniform. The average ultimate tensile strength and elongation of the weld bead by DC double pulse MIG welding can get to 228MPa, 80% of base metal, and 7.6%, 63% of base metal.

A Proposal of a Parallel Resistance Model for the Conduction Mechanism of Binary Transition Metal Oxide ReRAM

2007 ◽  
Vol 997 ◽  
Author(s):  
Kentaro Kinoshita ◽  
Hideyuki Noshiro ◽  
Chikako Yoshida ◽  
Yoshihiro Sato ◽  
Masaki Aoki ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Conduction Mechanism ◽  
Total Resistance ◽  
Intrinsic Properties ◽  
Parallel Connection ◽  
Resistance Model ◽  
Relationship Of ◽  
The Relationship ◽  
Parallel Resistance

AbstractA parallel resistance model (PRM), in which the total resistance, Rtotal, is given by a parallel connection of resistance of a filament, Rfila, and that of a film excluding a filament, Rexcl, was proposed to understand DC electric properties of resistive RAM (ReRAM). Here, the relationship of 1/Rtotal = 1/Rfila + 1/Rexcl is satisfied. To prove the validity of this model, the dependence of the relationship between resistance and temperature, R(T), of Pt/NiO/Pt on an area of a top electrode, S, was investigated. It was clarified that R(T) depended on S, which is the result definitely expected by the PRM. It was also clarified that smaller S is crucial to observe intrinsic properties of a filament of ReRAM.

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