Microstructure and mechanical properties of hot-pressed Ti–Co–Si compounds reinforced by intermetallic phases

Marzieh Ebrahimian; Mohammad Hossein Enayati; Fathallah Karimzadeh; You Jin Min; Dae Eun Kim

doi:10.1016/j.matchar.2020.110816

Microstructure and mechanical properties of hot-pressed Ti–Co–Si compounds reinforced by intermetallic phases

Marzieh Ebrahimian, Mohammad Hossein Enayati, Fathallah Karimzadeh, You Jin Min, Dae Eun Kim

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Monolithic TiCo and Ti₅Si₃ phases and Co_(ss)/Ti₅Si₃–Ti₃Co₂Si nanocomposite were fabricated via mechanical alloying followed by hot-pressing (HP). The XRD patterns of bulk samples showed a general decrease in peak widths after hot-pressing owing to an increase in crystal size caused by exposure to high temperature during the HP process. Nevertheless, the nano-crystallinity of the structure was retained after HP and no new phase was formed. As a dominant fracture mode, this material exhibited an intergranular fracture feature with low dimpled ruptures. Dry-sliding wear behavior was evaluated at room and high temperatures. The mean coefficient of friction and wear rate gradually decreased with increasing temperature due to the presence of discontinuous thin tribo-oxide and tribo-nitride layers on the worn surface. The wear rate obtained in this work was ~10 times lower than that previously reported for Ti compounds.

Original language	English
Article number	110816
Journal	Materials Characterization
Volume	171
DOIs	https://doi.org/10.1016/j.matchar.2020.110816
Publication status	Published - 2021 Jan

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C2004714 ). The authors would like to thank Professor Lee Woo Young at Materials Science and Engineering Department, Yonsei University for providing the hot pressing process facilities.

Publisher Copyright:
© 2020 Elsevier Inc.

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matchar.2020.110816

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title = "Microstructure and mechanical properties of hot-pressed Ti–Co–Si compounds reinforced by intermetallic phases",

abstract = "Monolithic TiCo and Ti5Si3 phases and Co(ss)/Ti5Si3–Ti3Co2Si nanocomposite were fabricated via mechanical alloying followed by hot-pressing (HP). The XRD patterns of bulk samples showed a general decrease in peak widths after hot-pressing owing to an increase in crystal size caused by exposure to high temperature during the HP process. Nevertheless, the nano-crystallinity of the structure was retained after HP and no new phase was formed. As a dominant fracture mode, this material exhibited an intergranular fracture feature with low dimpled ruptures. Dry-sliding wear behavior was evaluated at room and high temperatures. The mean coefficient of friction and wear rate gradually decreased with increasing temperature due to the presence of discontinuous thin tribo-oxide and tribo-nitride layers on the worn surface. The wear rate obtained in this work was ~10 times lower than that previously reported for Ti compounds.",

author = "Marzieh Ebrahimian and Enayati, {Mohammad Hossein} and Fathallah Karimzadeh and Min, {You Jin} and Kim, {Dae Eun}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C2004714 ). The authors would like to thank Professor Lee Woo Young at Materials Science and Engineering Department, Yonsei University for providing the hot pressing process facilities. Publisher Copyright: {\textcopyright} 2020 Elsevier Inc.",

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doi = "10.1016/j.matchar.2020.110816",

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AU - Ebrahimian, Marzieh

AU - Enayati, Mohammad Hossein

AU - Karimzadeh, Fathallah

AU - Min, You Jin

AU - Kim, Dae Eun

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C2004714 ). The authors would like to thank Professor Lee Woo Young at Materials Science and Engineering Department, Yonsei University for providing the hot pressing process facilities. Publisher Copyright: © 2020 Elsevier Inc.

PY - 2021/1

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N2 - Monolithic TiCo and Ti5Si3 phases and Co(ss)/Ti5Si3–Ti3Co2Si nanocomposite were fabricated via mechanical alloying followed by hot-pressing (HP). The XRD patterns of bulk samples showed a general decrease in peak widths after hot-pressing owing to an increase in crystal size caused by exposure to high temperature during the HP process. Nevertheless, the nano-crystallinity of the structure was retained after HP and no new phase was formed. As a dominant fracture mode, this material exhibited an intergranular fracture feature with low dimpled ruptures. Dry-sliding wear behavior was evaluated at room and high temperatures. The mean coefficient of friction and wear rate gradually decreased with increasing temperature due to the presence of discontinuous thin tribo-oxide and tribo-nitride layers on the worn surface. The wear rate obtained in this work was ~10 times lower than that previously reported for Ti compounds.

AB - Monolithic TiCo and Ti5Si3 phases and Co(ss)/Ti5Si3–Ti3Co2Si nanocomposite were fabricated via mechanical alloying followed by hot-pressing (HP). The XRD patterns of bulk samples showed a general decrease in peak widths after hot-pressing owing to an increase in crystal size caused by exposure to high temperature during the HP process. Nevertheless, the nano-crystallinity of the structure was retained after HP and no new phase was formed. As a dominant fracture mode, this material exhibited an intergranular fracture feature with low dimpled ruptures. Dry-sliding wear behavior was evaluated at room and high temperatures. The mean coefficient of friction and wear rate gradually decreased with increasing temperature due to the presence of discontinuous thin tribo-oxide and tribo-nitride layers on the worn surface. The wear rate obtained in this work was ~10 times lower than that previously reported for Ti compounds.

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Microstructure and mechanical properties of hot-pressed Ti–Co–Si compounds reinforced by intermetallic phases

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