Effect of the aluminum alloy composition (Al-Cu-Li or Al-Mg-Li) on structure and mechanical properties of dissimilar laser welds with the Ti-Al-V alloy

Маликов, А. Г.; Vitoshkin, I. E.; Orishich, A. M.; Филиппов, А. А.; Karpov, E. V.

doi:10.1016/j.optlastec.2020.106135

Cited by 20 publications

(13 citation statements)

References 45 publications

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“…In the titanium side, FZ, the microstructure is martensitic (α ), as shown in Figure 2d [5,27,30]. In fact, as reported in the literature [5,[8][9][10]13,31], the microstructure of the laser fusion zone of Ti-6Al-4V alloy is due to the complete evolution of the beta phase microstructure to martensitic one due to the high cooling rate. The HAZ is a mixture of martensitic and primary α grain [5,8,13,31].…”

Section: Analysis Of Welds Macrostructure and Microstructurementioning

confidence: 81%

“…In fact, as reported in the literature [5,[8][9][10]13,31], the microstructure of the laser fusion zone of Ti-6Al-4V alloy is due to the complete evolution of the beta phase microstructure to martensitic one due to the high cooling rate. The HAZ is a mixture of martensitic and primary α grain [5,8,13,31]. In the HAZ, during the welding heat thermal cycle, an increase of β phase occurs upon heating but, due to the lower peak of temperature, this transformation is never complete and some alpha phases remain unchanged, while the transformed beta grains develop the martensitic microstructure upon cooling.…”

Section: Analysis Of Welds Macrostructure and Microstructurementioning

confidence: 88%

“…In the joints 3T and 3B, due to the higher distance of laser beam from the Al alloy, the heat input is better confined in the Ti side. The lower heat conductivity of this alloy [5,9,10,27,29] leads to higher time in temperature and promotes higher size for the FZ and HAZ (Figure 6b). This effect is strengthened by the lowering of energy density with negative defocusing, as better shown below in Figure 7, that leads to lower temperature gradient [9,10].…”

Section: Intermetallic Layer and Geometry Of Welds Fusion Zonesmentioning

confidence: 99%

“…The benefits and the recent trend of laser welding of Ti/Al alloys in the academic sector and industry were explored by Quazy et al [4]. Recent trends also enclose dissimilar Al-Ti laser weldings based on high-strength aluminum-lithium alloys for aviation applications [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, although intermetallic compounds based on Ti-Al system are attractive, being characterized by good strength at high temperature, the development of IMC leads to restrictions on the available deformation modes. So, the occurrence of those particles is associated with increased strength but reduced ductility and fracture toughness [5].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Process Parameters, Post-Weld Heat Treatment and Peening Effects on Microstructure and Mechanical Performance of Ti–Al Dissimilar Laser Weldings

Leo

D’Ostuni

Nobile

et al. 2021

Metals

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Dissimilar Ti–Al laser weldings are very interesting due to their difficulties in being processed because of the different physical properties of the alloys and the crack formations during cooling and solidification. In this study, the effect of laser offset and defocusing on microstructure, geometry and mechanical properties response of 2 mm thick dissimilar AA6061/Ti-6Al-4V laser welds was analyzed. Moreover, in order to reduce residual stresses, the joints were both heat-treated and mechanically treated by ultrasonic peening. The welds microstructure was found to be martensitic in the Ti-6Al-4V fusion zone, columnar dendritic in the AA6061 fusion zone and partially martensitic in the Ti-6Al-4V heat-affected zone. Intermetallic compounds based on the Al–Ti system were detected at the AA6061/Ti-6Al-4V interface and in the aluminum fusion zone. Both negative defocusing and higher laser offset improved the tensile performance of the welds, mainly by reducing the amount of brittle intermetallic compounds. The stress relaxation heat treatment, leading to the aging of the martensite and the increasing of the size of the intermetallic compound, reduced the tensile strength and ductility of the joints. On the contrary, for dissimilar Al–Ti welds, mechanical treatment was effective in increasing joints ductility and, moreover, corrosion resistance.

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