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Synchrotron characterisation of ultra-fine grain TiB2/Al-Cu composite fabricated by laser powder bed fusion

DOI: 10.1007/s40195-021-01317-y DOI Help

Authors: Sheng Li (University of Birmingham) , Biao Cai (University of Manchester) , Ranxi Duan (University of Birmingham; Southern University of Science and Technology) , Lei Tang (University of Birmingham) , Zihan Song (University of Birmingham) , Dominic White (Carl Zeiss Ltd) , Oxana Magdysyuk (Diamond Light Source) , Moataz M. Attallah (University of Birmingham)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Acta Metallurgica Sinica (english Letters) , VOL 23

State: Published (Approved)
Published: September 2021
Diamond Proposal Number(s): 22506

Open Access Open Access

Abstract: Isotropy in microstructure and mechanical properties remains a challenge for laser powder bed fusion (LPBF) processed materials due to the epitaxial growth and rapid cooling in LPBF. In this study, a high-strength TiB2/Al-Cu composite with random texture was successfully fabricated by laser powder bed fusion (LPBF) using pre-doped TiB2/Al-Cu composite powder. A series of advanced characterisation techniques, including synchrotron X-ray tomography, correlative focussed ion beam–scanning electron microscopy (FIB-SEM), scanning transmission electron microscopy (STEM), and synchrotron in situ X-ray diffraction, were applied to investigate the defects and microstructure of the as-fabricated TiB2/Al-Cu composite across multiple length scales. The study showed ultra-fine grains with an average grain size of about 0.86 μm, and a random texture was formed in the as-fabricated condition due to rapid solidification and the TiB2 particles promoting heterogeneous nucleation. The yield strength and total elongation of the as-fabricated composite were 317 MPa and 10%, respectively. The contributions of fine grains, solid solutions, dislocations, particles, and Guinier–Preston (GP) zones were calculated. Failure was found to be initiated from the largest lack-of-fusion pore, as revealed by in situ synchrotron tomography during tensile loading. In situ synchrotron diffraction was used to characterise the lattice strain evolution during tensile loading, providing important data for the development of crystal-plasticity models.

Journal Keywords: Aluminium metal matrix composite; Laser powder bed fusion; Heterogeneous nucleation; Synchrotron characterisation

Diamond Keywords: Additive Manufacturing; Alloys

Subject Areas: Materials, Engineering

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 04/10/2021 09:02


Discipline Tags:

Materials Engineering & Processes Materials Science Engineering & Technology Composite Materials Metallurgy

Technical Tags:

Imaging Tomography