Influence of second phase particles on the mechanical properties of a high solute Al-Zn-Mg alloy fabricated through laser powder bed fusion

A. P. Babu; M. C. Lam; J. Ma; A. Huang; N. Birbilis

doi:10.1016/j.jallcom.2021.162958

Influence of second phase particles on the mechanical properties of a high solute Al-Zn-Mg alloy fabricated through laser powder bed fusion

A. P. Babu, M. C. Lam, J. Ma, A. Huang, N. Birbilis^*

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

A high solute 7xxx series aluminium alloy, Al-14Zn-3Mg (in wt%), was prepared using laser powder bed fusion (LPBF). To provide an insight into the correlation of second phase particles and mechanical properties, several heat treatment conditions were modelled with CALPHAD, and phase transformations were realised through in-situ characterisation techniques. It was revealed that the formation of T-phase (Mg₃₂(Zn, Al)₄₉) at 400 °C contributed to loss of ductility from the direct heat treatment of as-LPBF Al-14Zn-3Mg. However, the improvement in hardness of solutionised and peak aged Al-14Zn-3Mg was attributed to the formation of high volume fraction of η’ and η (MgZn₂) precipitates with low inter-precipitate spacing.

Original language	English
Article number	162958
Journal	Journal of Alloys and Compounds
Volume	897
DOIs	https://doi.org/10.1016/j.jallcom.2021.162958
Publication status	Published - 15 Mar 2022

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10.1016/j.jallcom.2021.162958

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title = "Influence of second phase particles on the mechanical properties of a high solute Al-Zn-Mg alloy fabricated through laser powder bed fusion",

abstract = "A high solute 7xxx series aluminium alloy, Al-14Zn-3Mg (in wt%), was prepared using laser powder bed fusion (LPBF). To provide an insight into the correlation of second phase particles and mechanical properties, several heat treatment conditions were modelled with CALPHAD, and phase transformations were realised through in-situ characterisation techniques. It was revealed that the formation of T-phase (Mg32(Zn, Al)49) at 400 °C contributed to loss of ductility from the direct heat treatment of as-LPBF Al-14Zn-3Mg. However, the improvement in hardness of solutionised and peak aged Al-14Zn-3Mg was attributed to the formation of high volume fraction of η{\textquoteright} and η (MgZn2) precipitates with low inter-precipitate spacing.",

keywords = "Additive manufacturing, Aluminium, CALPHAD, In-situ TEM, Quasicrystal, T-phase",

author = "Babu, {A. P.} and Lam, {M. C.} and J. Ma and A. Huang and N. Birbilis",

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doi = "10.1016/j.jallcom.2021.162958",

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T1 - Influence of second phase particles on the mechanical properties of a high solute Al-Zn-Mg alloy fabricated through laser powder bed fusion

AU - Babu, A. P.

AU - Lam, M. C.

AU - Ma, J.

AU - Huang, A.

AU - Birbilis, N.

PY - 2022/3/15

Y1 - 2022/3/15

N2 - A high solute 7xxx series aluminium alloy, Al-14Zn-3Mg (in wt%), was prepared using laser powder bed fusion (LPBF). To provide an insight into the correlation of second phase particles and mechanical properties, several heat treatment conditions were modelled with CALPHAD, and phase transformations were realised through in-situ characterisation techniques. It was revealed that the formation of T-phase (Mg32(Zn, Al)49) at 400 °C contributed to loss of ductility from the direct heat treatment of as-LPBF Al-14Zn-3Mg. However, the improvement in hardness of solutionised and peak aged Al-14Zn-3Mg was attributed to the formation of high volume fraction of η’ and η (MgZn2) precipitates with low inter-precipitate spacing.

AB - A high solute 7xxx series aluminium alloy, Al-14Zn-3Mg (in wt%), was prepared using laser powder bed fusion (LPBF). To provide an insight into the correlation of second phase particles and mechanical properties, several heat treatment conditions were modelled with CALPHAD, and phase transformations were realised through in-situ characterisation techniques. It was revealed that the formation of T-phase (Mg32(Zn, Al)49) at 400 °C contributed to loss of ductility from the direct heat treatment of as-LPBF Al-14Zn-3Mg. However, the improvement in hardness of solutionised and peak aged Al-14Zn-3Mg was attributed to the formation of high volume fraction of η’ and η (MgZn2) precipitates with low inter-precipitate spacing.

KW - Additive manufacturing

KW - Aluminium

KW - CALPHAD

KW - In-situ TEM

KW - Quasicrystal

KW - T-phase

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DO - 10.1016/j.jallcom.2021.162958

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VL - 897

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 162958

ER -

Influence of second phase particles on the mechanical properties of a high solute Al-Zn-Mg alloy fabricated through laser powder bed fusion

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