Novel processing route for design and manufacturing of metal toughened nanoceramics: Al–Al2O3 nanocermets

Sharma, Nidhi; Kumar, Raushan; Mitra, Rahul; Charalambous, Harry; Chuang, Andrew Chihpin; Biswas, Krishanu; Jha, Shikhar Krishn

doi:10.1016/j.ceramint.2022.05.180

Novel processing route for design and manufacturing of metal toughened nanoceramics: Al–Al₂O₃ nanocermets

Journal Article · Thu May 19 00:00:00 EDT 2022 · Ceramics International

DOI:https://doi.org/10.1016/j.ceramint.2022.05.180· OSTI ID:1902158

^[1]; Kumar, Raushan ^[1]; Mitra, Rahul ^[1]; ^[2]; ^[2]; Biswas, Krishanu ^[1]; ^[1]

Indian Inst. of Technology (IIT), Kanpur (India)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Monolithic alumina is a highly brittle ceramic with a very low fracture toughness, making it an unreliable material for mechanical and structural applications. Ceramic-metal composites (cermets) are the subject of intensive interest to obtain materials which can address the intrinsic brittleness of ceramics without compromising their high strength and light weight. In the present investigation, aluminium-alumina (Al–Al₂O₃) nanocermets were developed. The nanocermets possessed the toughness of Al phase and the strength of reinforced nano Al₂O₃ particles. Here, the nanocermets green bodies were prepared such that upon sintering each adjacent Al₂O₃ grain was conformally coated with a continuous Al film. Mechanical milling via a combination of cryo-milling and ball-milling was used to prepare Al–Al₂O₃ nano-powder mixture. Spark plasma sintering was used to consolidate the green nanocermets. Results show that specimens prepared from 35 h milled powders exhibited superior mechanical properties as compared to other nanocermets, with an improvement in microhardness, elastic modulus, compressive strength, and flexural strength by 88%, 78%, 69% and 40% with respect to sintered pure Al. The indentation toughness of 35 h milled nanocermet showed an increment of 12.5% with respect to sintered pure Al₂O₃. Characterization techniques such as XRD, SEM, HR-TEM, X-ray tomography were employed to investigate the phase evolution and structural morphology, while FEM simulations were performed for understanding the crack propagation mechanisms in nanocermets.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1902158

Alternate ID(s):: OSTI ID: 1960611

Journal Information:: Ceramics International, Journal Name: Ceramics International Journal Issue: 17 Vol. 48; ISSN 0272-8842

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Novel processing route for design and manufacturing of metal toughened nanoceramics: Al–Al2O3 nanocermets

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