Crystallization of a Zr-based metallic glass produced by laser powder bed fusion and suction casting

• The crystallization behaviour during low temperature annealing of samples of the Zr59.3Cu28.8Al10.4Nb1.5 (at%) bulk metallic glass produced by suction casting and the laser powder bed fusion (LPBF) process were studied with small angle neutron scattering (SANS), X-ray diffraction and scanning electron microscopy. The in-situ SANS measurements during isothermal annealing reveals that the phase separation in the LPBF processed material proceeds at a smaller characteristic length-scale than the cast material. Quantitative analysis of the SANS data shows that, while the crystallization process in both materials proceed through rapid nucleation followed by diffusion limited growth, the LPBF processed material crystallizes with a smaller cluster size and at a higher rate. The smaller cluster size is attributed to the elevated oxygen content in the LPBF processed material which reduces the nucleation barrier and thus the thermal stability.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

Nyckelord

Additive manufacturing

AMZ4

Crystallization

Oxygen

Small angle scattering

3D printers

Aluminum alloys

Cluster analysis

Copper alloys

Glass

Metallic glass

Neutron scattering

Niobium alloys

Nucleation

Phase separation

Scanning electron microscopy

Temperature

Zircaloy

Cluster sizes

Laser powders

Powder bed

Processed materials

Small clusters

Small-angle neutron scattering

Small-angle scattering

Suction casting

Additive manufacturing

AMZ4

Crystallization

Oxygen

Small angle scattering

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