High-throughput screening of laser additive manufactured metallic glass via ultrasonic wave

Abstract

Laser additive manufacturing (LAM) technology provides an opportunity to fabricate bulk metallic glasses (BMGs) without any dimensional constraint and achieve the large-scale applications of BMGs. However, flaws, such as cracks, gas porosity, and crystalline phases, are always formed accompanied by the process of LAM, which seriously worsens the mechanical and physical properties of the resulting BMGs. Here, we present a novel method that involves ultrasonic wave technique to high-throughput screen the optimum process parameters for the LAM of BMG. A parameter library, constituted by a series of rectangular BMG samples, is rapidly fabricated by the LAM method under continuously changed combinations of laser power and travel speed. The ultrasonic attenuation factor, which is sensitive to the flaws, is used as the monitor to screen the parameters of the BMGs fabricated by the LAM. Using this approach, the laser power of 1300 W and travel speed of 600 mm/min are estimated as the optimum parameter combination for the LAM of a Zr51Ti5Ni10Cu25Al9 (Zr51) BMG with the slightest flaws. The amorphous-phase dominated microstructure and the sufficiently high tensile strength of the subsequent fabricated large-sized Zr51 BMG sample verify this optimum parameter combination.

Tensile and Impact Toughness Properties of a Zr-Based Bulk Metallic Glass Fabricated via Laser Powder-Bed Fusion

“…No macroscopic plastic deformation was detected in the tensile tests ( Figure 5 ), in agreement with Refs [ 35 , 36 ]. Lin et al [ 36 ] correlated this behavior to the annealing effect, which happens in laser-based AM processes because of the associated cyclic heating.…”

“…Since there is only one reported study [ 33 ] on the tensile properties of BMGs fabricated via LPBF, the present results were also compared to properties measured on BMGs fabricated via other AM methods, such as DED [ 34 , 35 , 36 , 37 ]. Figure 7 plots our AMZ4 results together with those of Ref.…”

“…They did not increase the input energy, which could decrease the formation of LoFs, to prevent crystallization. Tensile properties of BMGs, and BMG composites fabricated with another laser-based AM process, i.e., direct energy deposition (DED) [ 34 , 35 , 36 , 37 ] have been previously investigated. However, to the best of our knowledge, the influence of defects on the impact toughness of BMGs fabricated via AM has not been reported so far.…”

A deep learning approach to the inverse problem of modulus identification in elasticity

“…Generally speaking, solving inverse problems of elasticity accurately and efficiently can be challenging, especially when real-time response 10 and high-throughput applications 11 are in demand. Compared to the forward problem (i.e., to obtain the deformation field under given elastic properties), the inverse problem is more expensive to solve.…”

“…15 Ultrasound-based NDE techniques have proven potentials in high-throughput screening and fabrication of laser additive manufactured metallic glasses. 11 These emerging opportunities and demands are calling for more advances in solving the inverse problem of modulus identification in elasticity with high efficiency and accuracy.…”