Local mechanical properties, microstructure, and microtexture in friction stir welded Ti-6Al-4V alloy

Fall, Ameth; Monajati, H.; Khodabandeh, Alireza; Fesharaki, M. H.; Champliaud, Henri; Jahazi, Mohammad

doi:10.1016/j.msea.2019.01.077

Cited by 39 publications

(16 citation statements)

References 42 publications

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“…Static mechanical properties of friction stir welded (FSW) joint have been found to be affected by a local microstructure of the joint [1,2,3,4,5,6,7]. Research on the relation between microstructure evolution and mechanical properties in the FSW joint, grain size, grain orientation, and texture variation are taken into account.…”

Section: Introductionmentioning

confidence: 99%

“…Research on the relation between microstructure evolution and mechanical properties in the FSW joint, grain size, grain orientation, and texture variation are taken into account. The finer grain size, the higher angle grain boundaries and more random textures in the stir zone lead to the higher strength and larger elongation of the joint [3,4,5]. The changes of grain orientation and texture have an effect on the mechanical properties [6].…”

Section: Introductionmentioning

confidence: 99%

“…The changes of grain orientation and texture have an effect on the mechanical properties [6]. Falla et al [5] found that lower hardness and larger grains in the heat-affected zone (HAZ) increased the sensitivity to cracking in the HAZ.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Modeling Containing Hardening Particles and Grain Orientation for Aluminum Alloy FSW Joints

Sun

Guo

Xiao³

et al. 2019

Materials

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The macro-mesoscopic joint fatigue model containing hardening particles and crystal characteristics is established to study the effect of the hardening particles and the grain orientation on fatigue properties of an aluminum alloy friction stir welding (FSW) joint. The macroscopic model is composed of the weld nugget zone, thermo-mechanically affected zone, heat-affected zone, and base material, according to the metallurgical morphology and hardness distribution of the joint. Cyclic stress and strain data are used to determine the material properties. The fatigue parameters used in the calculation of cyclic stresses and strains are obtained with the four-point correlation method. The mesoscopic models of different zones are inserted into the joint macroscopic model as submodules. The models containing the information of hardening particles and grain orientation are established with crystal plasticity theory for the grains and isotropic hardening rule for the hardening particles. The effects of hardening particles and grain orientation on the stress and strain responses are discussed. The simulation results show that high-angle misorientation of adjacent grains hinders the stress transfer. The particle cluster or cracked particles intensify the stress and strain concentrations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue Modeling Containing Hardening Particles and Grain Orientation for Aluminum Alloy FSW Joints

Sun

Guo

Xiao³

et al. 2019

Materials

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“…FSW is one method of solid-state joining titanium and its alloys that can prevent the mechanical properties of titanium welded joints from deteriorating by other welding processes [1,2,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Titanium Alloys Plastic Flow in Linear Friction Welding

et al. 2021

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The article presents the results of the analysis of the plastic flow of titanium alloys in the process of the Linear Friction Welding (LFW). LFW is a high-tech process for joining critical structural elements of aerospace engineering from light and high-temperature alloys. Experimental studies of LFW modes of such alloys are expensive and technically difficult. Numerical simulation was carried out for understanding the physics of the LFW process and the formation laws of a strong welded joint of titanium alloys. Simulation by the SPH method was performed using the LS DYNA software package (ANSYS WB 15.2) and the developed module for the constitutive equation. The new coupled thermomechanical 3D model of LFW process for joining structural elements from alpha and alpha + beta titanium alloys was proposed. It was shown that the formation of a welded joint occurs in a complex and unsteady stress-strain state. In the near-surface layers of the bodies being welded, titanium alloys can be deformed in the mode of severe plastic deformation. A deviation of the symmetry plane of the plastic deformation zone from the initial position of the contact plane of the bodies being welded occurs during a process of LFW. Extrusion of material from the welded joint zone in the transverse direction with respect to the movement of bodies is caused by a pressure gradient and a decrease in the alloy flow stress due to heating. The hcp-bcc phase transition of titanium alloys upon heating in the LFW process necessitates an increase in the cyclic loading time to obtain a welded joint.

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“…Hexagonal close-packed (HCP) metals, such as Ti, Mg, Zn and Zr, are of interest for engineering and medical applications due to their unique combination of high ductility and strength. In recent years, intensive efforts have been focused on investigations of the physical and mechanical properties of alloys, whose grain structure is formed by surface rolling, severe plastic deformation, selective laser melting, or selective laser sintering, and friction stir processing [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution

Skripnyak

2020

Springer Tracts in Mechanical Engineering

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A multi-scale computational approach was used for the investigation of a high strain rate deformation and fracture of magnesium and titanium alloys with a bimodal distribution of grain sizes under dynamic loading. The processes of inelastic deformation and damage of titanium alloys were investigated at the mesoscale level by the numerical simulation method. It was shown that localization of plastic deformation under tension at high strain rates depends on grain size distribution. The critical fracture stress of alloys depends on relative volumes of coarse grains in representative volume. Microcracks nucleation at quasi-static and dynamic loading is associated with strain localization in ultra-fine grained partial volumes. Microcracks arise in the vicinity of coarse and ultrafine grains boundaries. It is revealed that the occurrence of a bimodal grain size distributions causes increased ductility, but decreased tensile strength of UFG alloys. The increase in fine precipitation concentration results not only strengthening but also an increase in ductility of UFG alloys with bimodal grain size distribution.

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Local mechanical properties, microstructure, and microtexture in friction stir welded Ti-6Al-4V alloy

Cited by 39 publications

References 42 publications

Fatigue Modeling Containing Hardening Particles and Grain Orientation for Aluminum Alloy FSW Joints

Fatigue Modeling Containing Hardening Particles and Grain Orientation for Aluminum Alloy FSW Joints

Modeling of Titanium Alloys Plastic Flow in Linear Friction Welding

Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution

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