Enhanced age-hardening response in Mg–Zn–Co alloys with Bi additions

C. He; C. Q. Liu; H. W. Chen; J. F. Nie

doi:10.1016/j.jallcom.2019.152419

Enhanced age-hardening response in Mg–Zn–Co alloys with Bi additions

C. He, C. Q. Liu, H. W. Chen, J. F. Nie

Materials Science & Engineering

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

14 Citations (Scopus)

Abstract

Effects of Bi additions on age-hardening response and precipitation of Mg–2.31Zn–0.31Co (at.%) alloy have been investigated. The addition of Bi can substantially promote the age-hardening response at 200 °C. The precipitates microstructure is characterized using high-angle annular dark-field scanning transmission electron microscope, and the results show that the remarkable improvement is attributed to a much higher number density of β₁^' rods and the formation of prismatic Mg₃Bi₂ plates. At the early stage of ageing, Mg₃Bi₂ precipitates out first and then Zn segregates to the Mg₃Bi₂/Mg interface, which could provide chemical environment and heterogeneous nucleation sites for the subsequent precipitation of the β₁^' phase.

Original language	English
Article number	152419
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	815
DOIs	https://doi.org/10.1016/j.jallcom.2019.152419
Publication status	Published - 30 Jan 2020

Keywords

Age-hardening
Heterogeneous precipitation
Interface segregation
Magnesium alloys

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10.1016/j.jallcom.2019.152419

291826817-oaAccepted author manuscript, 981 KBLicence: CC BY-NC-ND

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title = "Enhanced age-hardening response in Mg–Zn–Co alloys with Bi additions",

abstract = "Effects of Bi additions on age-hardening response and precipitation of Mg–2.31Zn–0.31Co (at.%) alloy have been investigated. The addition of Bi can substantially promote the age-hardening response at 200 °C. The precipitates microstructure is characterized using high-angle annular dark-field scanning transmission electron microscope, and the results show that the remarkable improvement is attributed to a much higher number density of β1' rods and the formation of prismatic Mg3Bi2 plates. At the early stage of ageing, Mg3Bi2 precipitates out first and then Zn segregates to the Mg3Bi2/Mg interface, which could provide chemical environment and heterogeneous nucleation sites for the subsequent precipitation of the β1' phase.",

keywords = "Age-hardening, Heterogeneous precipitation, Interface segregation, Magnesium alloys",

author = "C. He and Liu, {C. Q.} and Chen, {H. W.} and Nie, {J. F.}",

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T1 - Enhanced age-hardening response in Mg–Zn–Co alloys with Bi additions

AU - He, C.

AU - Liu, C. Q.

AU - Chen, H. W.

AU - Nie, J. F.

PY - 2020/1/30

Y1 - 2020/1/30

N2 - Effects of Bi additions on age-hardening response and precipitation of Mg–2.31Zn–0.31Co (at.%) alloy have been investigated. The addition of Bi can substantially promote the age-hardening response at 200 °C. The precipitates microstructure is characterized using high-angle annular dark-field scanning transmission electron microscope, and the results show that the remarkable improvement is attributed to a much higher number density of β1' rods and the formation of prismatic Mg3Bi2 plates. At the early stage of ageing, Mg3Bi2 precipitates out first and then Zn segregates to the Mg3Bi2/Mg interface, which could provide chemical environment and heterogeneous nucleation sites for the subsequent precipitation of the β1' phase.

AB - Effects of Bi additions on age-hardening response and precipitation of Mg–2.31Zn–0.31Co (at.%) alloy have been investigated. The addition of Bi can substantially promote the age-hardening response at 200 °C. The precipitates microstructure is characterized using high-angle annular dark-field scanning transmission electron microscope, and the results show that the remarkable improvement is attributed to a much higher number density of β1' rods and the formation of prismatic Mg3Bi2 plates. At the early stage of ageing, Mg3Bi2 precipitates out first and then Zn segregates to the Mg3Bi2/Mg interface, which could provide chemical environment and heterogeneous nucleation sites for the subsequent precipitation of the β1' phase.

KW - Age-hardening

KW - Heterogeneous precipitation

KW - Interface segregation

KW - Magnesium alloys

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DO - 10.1016/j.jallcom.2019.152419

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

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Enhanced age-hardening response in Mg–Zn–Co alloys with Bi additions

Abstract

Keywords

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