Synchrotron Characterisation of Ultra-Fine Grain TiB2/Al-Cu Composite Fabricated by Laser Powder Bed Fusion

Li, Sheng1; Cai, Biao1; Duan, Ranxi1,2; Tang, Lei1; Song, Zihan1; White, Dominic3; Magdysyuk, Oxana, V4; Attallah, Moataz M.1

2021-09-01

10.1007/s40195-021-01317-y

Acta Metallurgica Sinica-English Letters   影响因子和分区

1006-7191

2194-1289

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 mu m, 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.

Aluminium metal matrix composite Laser powder bed fusion Heterogeneous nucleation Synchrotron characterisation

SCI ; EI

英语

其他

Royal Society["IEC\\NSFC\\191319","RGS\\R2\\202122"]

Metallurgy & Metallurgical Engineering

Metallurgy & Metallurgical Engineering

WOS:000701341200001

CHINESE ACAD SCIENCES, INST METAL RESEARCH

20214010968055

Aluminum ; Fabrication ; High resolution transmission electron microscopy ; Ion beams ; Metallic matrix composites ; Powder metals ; Scanning electron microscopy ; Textures ; Titanium compounds ; Tomography

Metallurgy and Metallography:531 ; Aluminum:541.1 ; Optical Devices and Systems:741.3 ; Imaging Techniques:746 ; High Energy Physics:932.1 ; Crystal Growth:933.1.2

Web of Science

1.Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
3.ZEISS House,Bldg 1030,Cambourne Business Pk, Cambridge CB23 6DW, England
4.Diamond Light Source Ltd, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

Li, Sheng,Cai, Biao,Duan, Ranxi,et al. Synchrotron Characterisation of Ultra-Fine Grain TiB2/Al-Cu Composite Fabricated by Laser Powder Bed Fusion[J]. Acta Metallurgica Sinica-English Letters,2021,35:78-92.

Li, Sheng.,Cai, Biao.,Duan, Ranxi.,Tang, Lei.,Song, Zihan.,...&Attallah, Moataz M..(2021).Synchrotron Characterisation of Ultra-Fine Grain TiB2/Al-Cu Composite Fabricated by Laser Powder Bed Fusion.Acta Metallurgica Sinica-English Letters,35,78-92.

Li, Sheng,et al."Synchrotron Characterisation of Ultra-Fine Grain TiB2/Al-Cu Composite Fabricated by Laser Powder Bed Fusion".Acta Metallurgica Sinica-English Letters 35(2021):78-92.