Remarkable thermal stability of the Al-Ca-Ni-Mn alloy manufactured by laser-powder bed fusion

•A novel Al-Ca-Ni-Mn alloy for laser-powder bed fusion technique is proposed.•A high hardness (~200 HV) of as-built sample is achieved.•The hardness decreases slightly after annealing at up to 400C.•Predominant contribution of eutectic particles to hardening is explained. Microstructure and hardness...

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Bibliographic Details
Published in:Materials letters 2021-02, Vol.285, p.129074, Article 129074
Main Authors: Shurkin, P.K., Letyagin, N.V., Yakushkova, A.I., Samoshina, M.E., Ozherelkov, D. Yu, Akopyan, T.K.
Format: Article
Language:English
Subjects:
Additive manufacturing
Al alloys
Aluminum
Annealing
Cellular structure
Hardness
Manganese base alloys
Materials science
Microstructure
Nickel
Orowan loops
Powder beds
Thermal stability
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Summary:•A novel Al-Ca-Ni-Mn alloy for laser-powder bed fusion technique is proposed.•A high hardness (~200 HV) of as-built sample is achieved.•The hardness decreases slightly after annealing at up to 400C.•Predominant contribution of eutectic particles to hardening is explained. Microstructure and hardness of the Al-Ca-Ni-Mn alloy fabricated by laser-powder bed fusion were studied in as-built condition and after annealing at 200–400 °C for 3 h. A formation of pseudoeutectic cellular structure and outstanding hardness of 200 HV were reported in the initial state. A decrease in hardness down to 161 HV after exposure at 300 °C and no further degradation occurred after heating up to 400 °C. The softening was accompanied by the growth of primary phase up to ~800 nm and eutectic phase to ~90 nm. The latter had the most contribution into hardening that was explained by Orowan looping mechanism.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.129074