3D printing of Fe-based bulk metallic glass composites with combined high strength and fracture toughness

Li, Ning; Zhang, Jianji; Wei, Xing; Ouyang, Di; Liu, Lin

doi:10.1016/j.matdes.2018.01.061

Cited by 165 publications

(63 citation statements)

References 49 publications

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“…Therefore, boundary conditions for heat transfer should be considered, described as [13]:

q_{c o n d} = q (x, y, z) - q_{c} - q_{r}

where the heat losses through conduction

q_{c o n d}

, convection

q_{c}

and radiation

q_{r}

in the laser scan model are expressed as [39]:

q_{c o n d} = - k Δ T

q_{c} = h_{c} (T - T_{0})

q_{r} = σ \in (T^{4} - T_{0}^{4})

in which

k

is thermal conductivity,

h_{c}

is the heat convection coefficient,

σ

is the Stefan-Boltzman constant,

\in

is the emissivity of the powder bed, 𝑇 is the temperature of the molten pool, and

T_{0}

is the ambient temperature.…”

Section: Constitutive Model and Finite Element Simulationmentioning

confidence: 99%

Estimation of Residual Stress in Selective Laser Melting of a Zr-Based Amorphous Alloy

Wei

Ouyang

et al. 2018

Materials

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An accurate estimation of residual stresses is crucial to ensure dimensional accuracy and prevent premature fatigue failure of 3D printed components. Different from their crystalline counterparts, the effect of residual stress would be worse for amorphous alloys owing to their intrinsic brittleness with low fracture toughness. However, the generation of residual stress and its performance in 3D printed amorphous alloy components still remain unclear. Here, a finite element method combined with experiments and theoretical analyses was introduced to estimate the residual stress in selective laser melting of a Zr-based amorphous alloy. The results revealed that XY cross scanning strategy exhibits relatively low residual stress by comparison with X and Y strategies, and the residual stress becomes serious with increasing bar thickness. The residual stress, on the other hand, could be tuning by annealing or preheating the substrate. The above scenario is thoroughly understood according to the temperature gradient mechanism and its effect on microstructure evaluation.

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“…Therefore, boundary conditions for heat transfer should be considered, described as [13]:

q_{c o n d} = q (x, y, z) - q_{c} - q_{r}

where the heat losses through conduction

q_{c o n d}

, convection

q_{c}

and radiation

q_{r}

in the laser scan model are expressed as [39]:

q_{c o n d} = - k Δ T

q_{c} = h_{c} (T - T_{0})

q_{r} = σ \in (T^{4} - T_{0}^{4})

in which

k

is thermal conductivity,

h_{c}

is the heat convection coefficient,

σ

is the Stefan-Boltzman constant,

\in

is the emissivity of the powder bed, 𝑇 is the temperature of the molten pool, and

T_{0}

is the ambient temperature.…”

Section: Constitutive Model and Finite Element Simulationmentioning

confidence: 99%

Estimation of Residual Stress in Selective Laser Melting of a Zr-Based Amorphous Alloy

Wei

Ouyang

et al. 2018

Materials

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“…It is interesting to notice that the fabrication of an SLM part is to overlay the procedures of small melting pools generated by laser spots in micro-diameter, which makes the SLM method bypass the D c problem encountered by other conventional methods. Some research has been made on BMG additive manufacturing in recent years; Fe-, Zr-, and Al-based amorphous alloys were fabricated, and nano-crystals were found in the heat-affected zone (HAZ) [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Additive Manufactured Large Zr-Based Bulk Metallic Glass Composites with Desired Deformation Ability and Corrosion Resistance

et al. 2020

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Zr-based bulk metallic glasses have been attracting tremendous interest of researchers because of their unique combination of mechanical and chemical properties. However, their application is limited as large-scale production is difficult due to the limitation of cooling rate. Recently, additive manufacturing technology has been proposed as a new solution for fabricating bulk metallic glasses without size limitation. In this study, selective laser melting technology was used to prepare Zr60Fe10Cu20Al10 bulk metallic glass. The laser parameters for fabricating full dense amorphous specimens were investigated. The mechanical and corrosion resistance properties of the prepared samples were measured by micro-compression and electrochemical corrosion testing, respectively. Lastly, Zr60Fe10Cu20Al10 bulk metallic glass (BMG) with dispersed nano-crystals was made, and good deformation ability was revealed during micro-compression test. The corrosion resistance decreased a bit due to the crystalline phases. The results provide a promising route for manufacturing large and complex bulk metallic glasses with better mechanical property and acceptable corrosion resistance.

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“…One of the indirect methods is the Becker-Kersten (BK) method [6], which is based on the measurements of the hysteresis loop in dependence on the applied external stress and provides accurate results for the volume coefficient of magnetostriction, especially for the magnetically soft amorphous and nanocrystalline ribbons prepared using planar flow casting [7,8]. This technique could be also used for new Fe-based metallic glasses prepared by 3D print technology [9].…”

Section: Introductionmentioning

confidence: 99%

Surface Magnetostriction of FeCoB Amorphous Ribbons Analyzed Using Magneto-Optical Kerr Microscopy

et al. 2020

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Surface sensitive magneto-optical Kerr microscopy completed with the special self-made sample holder is used for studying the magneto-elastic behaviour in the surface of the as-quenched amorphous Fe73Co12B15 alloy. The 10, 5, and 3 mm wide and approximately 34 μm thick ribbons were prepared by the conventional planar flow casting process. The experimental setup allows for a simultaneous application of an external magnetic field in the directions parallel and perpendicular to the ribbon axis and of compression stress from one side of the sample, resulting in tensile stress in opposite side. The distributions of tensile stresses in the measured surface were modelled by the finite element method. The observed changes of the magnetic domains and hysteresis loop anisotropy field under applied stress are evaluated using the Becker–Kersten method. This resulted in the determination of the local surface magnetostrictive coefficient from an area of about 200 μm in diameter. The obtained values ranged between 37–60 ppm and were well comparable with the bulk value presented in the literature.

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3D printing of Fe-based bulk metallic glass composites with combined high strength and fracture toughness

Cited by 165 publications

References 49 publications

Estimation of Residual Stress in Selective Laser Melting of a Zr-Based Amorphous Alloy

Estimation of Residual Stress in Selective Laser Melting of a Zr-Based Amorphous Alloy

Additive Manufactured Large Zr-Based Bulk Metallic Glass Composites with Desired Deformation Ability and Corrosion Resistance

Surface Magnetostriction of FeCoB Amorphous Ribbons Analyzed Using Magneto-Optical Kerr Microscopy

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