Alexandre Bois-Brochu

Quebec Metallurgy Center · Additive Manufacturing

This study demonstrated the viability of the electrode induction gas atomization process (EIGA) to produce spherical Ti-5Fe powder suitable for additive manufacturing. The resulting powder is spherical and presents no surface defects. Additionally, the iron distribution throughout the microstructure is homogenous and indicates similar particle size...

Ultrasonic welding additive manufacturing (UWAM) enables the production of metallic components by forming metallurgical bonds between superimposed thin foils using continuous ultrasonic welding. The aluminum alloys that were considered in this study were AA5005 (0.8%-wt. Mg), AA5052 (2.4%-wt. Mg), and AA5056 (4.9%-wt. Mg). The influence of Mg conte...

This research focuses on specimen geometry and the associated surface roughness of H13 hot-work tool steel, processed using laser-directed energy deposition additive manufacturing, and varying both the powder feed rate and the laser scanning speed. Under the examined conditions, the test sample measurements of length and width did not vary, but the...

One of the most exciting possibilities brought forward by some additive manufacturing (AM) processes is their ability to deposit materials on existing parts. Mainly achievable with directed energy deposition systems, it is thus possible to repair worn or broken components. Two applications were studied in this research: (1) complete construction an...

Low-pressure die-cast (LPDC) 319 Al alloy is commonly processed with hot isostatic pressing (HIP), heat treatment, and chemical eutectic silicon modification for advanced automotive applications. Yet, the microstructure can be similarly influenced by each of these processes, which may obscure their isolated benefits. Hence, this study aimed to diff...

This study focuses on the impact properties of Ti–6Al–4V produced by LPBF using un-notched Charpy impact testing. The effects of the build orientation, impact orientation, and half stress-relief and hot isostatic press (HIP) heat treatments on the impact resistance were investigated. The impact properties of HIPed samples were significantly greater...

This work investigates the relationships between the static mechanical properties of Ti-6Al-4V manufactured through selective laser melting (SLM) and post-process heat treatments, namely stress relieve, annealing and hot isostatic pressing (HIP). In particular, Ti-6Al-4V parts were fabricated in three different build orientations of X, Z, and 45° t...

Some AM processes such as directed energy deposition (DED) have typical powder usage efficiencies ranging between 40 and 80%. Since, for a given alloy, powder cost is proportional to its purity, choosing a less expensive powder or reusing powders is interesting for economical and environmental reasons. The work summarized below studied the effect o...

The development of aluminum-lithium alloys for aerospace applications requires a thorough understanding of how processing and product geometry impact their microstructure, texture and mechanical properties. The anisotropy of the mechanical properties is in part related to the deformation texture formed during thermo-mechanical processing. In this s...

Hypoeutectic aluminum alloys such as A356.0 (Al-7Si-0.3Mg) are usually subjected to strontium additions in order to obtain a chemically modified eutectic morphology. The modification of the eutectic silicon from sharp acicular plates to a fibrous structure is normally applied to improve the alloy ductility. However, strontium additions are relative...

Aluminium alloys have gained popularity for automotive applications, due to their high strength-to-weight ratio and thermal conductivity. In particular, cylinder heads are commonly produced from Al-Si-Cu alloys, given their age-hardenability and excellent castability. However, operating temperatures can induce thermal stresses in the heads, which c...

Alpha case presence on titanium parts that are produced by investment casting is problematic and has to be removed. Metallographic measurements and micro-hardness profiles are the traditional techniques used to evaluate its thickness. However, to obtain a better understanding of how the alpha case is formed and with the underlying objective of limi...

The development of aluminum–lithium alloys for aerospace applications requires a thorough understanding of how processing and product geometry impact their microstructure, texture and mechanical properties. The anisotropy of the mechanical properties is in part related to the deformation texture formed during thermo-mechanical processing. In this s...

Fatigue crack growth (FCG) behavior of an integrally stiffened panel (ISP) of the 2099-T83 Al–Li alloy was investigated both at ambient (23 °C) and low (−30 °C) temperatures. FCG rates have been found to correlate with the local extrusion aspect ratio (AR), as a result of the combined effects of both the grain structure and the crystallographic tex...

The presence of an alpha case on titanium parts produced by investment casting is problematic and has to be eliminated. The evaluation of the thickness to be removed can be done using different techniques such as metallographic measurements, microhardness profiles and electron microprobe analyzer (EMPA) linescans. Those three techniques measure dif...

Introduction Experimental procedures Results and discussions Conclusion Acknowledgments

The use of aluminum-lithium alloys in aerospace applications requires a thorough knowledge of how processing and product geometry impact their microstructure, texture and mechanical properties. As with other aluminum alloys, anisotropy of mechanical properties has been related to the formation of deformation textures during thermo-mechanical proces...

Aluminum-lithium alloy 2099-T83 is an advanced material with superior mechanical properties, as compared to traditional alloys used in structural applications, and has been selected for use in the latest generation of airplanes. While this alloy exhibits improved fatigue crack growth (FCG) performance over non-Li alloys, it is of interest to simula...

Utilization of aluminium-lithium alloys in aerospace applications requires an understanding of how processing and product geometry impact their microstructure, crystallographic texture and mechanical properties. In this paper, the effect of various microstructural features as well as deformation textures on the static mechanical properties of Al-Li...

An integrally stiffened panel (ISP) made from extruded 2099-T83 Al-Li alloy was subjected to fatigue loadings to investigate the influence of both the local texture and grain structure on fatigue crack propagation (FCP) behavior. The microstructure was mainly unrecrystallized. Grains were mostly layered in the web and fibrous in the other locations...