Microstructure, tensile properties of SLMed TNT5Zr-0.2O alloys without/with keyholes produced by different Post-processing treatments

Weihuan Kong; Qi Shi; Sophie C. Cox; Min Kuang; Moataz M. Attallah

doi:10.1016/j.matlet.2021.131448

Microstructure, tensile properties of SLMed TNT5Zr-0.2O alloys without/with keyholes produced by different Post-processing treatments

Weihuan Kong, Qi Shi, Sophie C. Cox, Min Kuang, Moataz M. Attallah^*

^*Corresponding author for this work

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

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Abstract

Ti-34Nb-13Ta-5Zr-0.2O alloy (hereafter termed TNT5Zr-0.2O) with keyhole defects was fabricated by SLM. The microstructure and tensile properties have been investigated after two post-processing treatments, namely vacuum heat treatment (HT) and hot isostatic pressing (HIP). Microstructure shows both alloys retain beta grain matrix along with discrete nano-sized grain boundary alpha precipitates. The stress concentrations at the edge of keyholes make the voids wall collapse under tension and cracks propagate more easily in that region. Notably, the pore enclosure by HIP is not contribute to a better ductility of this alloy. This explains why the TNT5Zr-0.2O-HT alloy possesses lower UTS (978 ± 19 MPa) and elastic modulus (49 ± 3 GPa), but higher elongation (4.5% ± 0.6%) in comparison with TNT5Zr-0.2O-HIP sample.

Original language	English
Article number	131448
Journal	Materials Letters
Volume	309
Early online date	8 Dec 2021
DOIs	https://doi.org/10.1016/j.matlet.2021.131448
Publication status	Published - 15 Feb 2022

Bibliographical note

Funding Information:
MMA acknowledges the financial support for work provided by Institute of New Materials, Guangdong Academy of Sciences (PI: MMA, grant: 17-0551).

Keywords

Beta Ti alloy
Keyhole
Microstructure
Selective laser melting
Tensile properties

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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KongW2021MicrostructureAccepted author manuscript, 1.67 MBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

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title = "Microstructure, tensile properties of SLMed TNT5Zr-0.2O alloys without/with keyholes produced by different Post-processing treatments",

abstract = "Ti-34Nb-13Ta-5Zr-0.2O alloy (hereafter termed TNT5Zr-0.2O) with keyhole defects was fabricated by SLM. The microstructure and tensile properties have been investigated after two post-processing treatments, namely vacuum heat treatment (HT) and hot isostatic pressing (HIP). Microstructure shows both alloys retain beta grain matrix along with discrete nano-sized grain boundary alpha precipitates. The stress concentrations at the edge of keyholes make the voids wall collapse under tension and cracks propagate more easily in that region. Notably, the pore enclosure by HIP is not contribute to a better ductility of this alloy. This explains why the TNT5Zr-0.2O-HT alloy possesses lower UTS (978 ± 19 MPa) and elastic modulus (49 ± 3 GPa), but higher elongation (4.5% ± 0.6%) in comparison with TNT5Zr-0.2O-HIP sample.",

keywords = "Beta Ti alloy, Keyhole, Microstructure, Selective laser melting, Tensile properties",

author = "Weihuan Kong and Qi Shi and Cox, {Sophie C.} and Min Kuang and Attallah, {Moataz M.}",

note = "Funding Information: MMA acknowledges the financial support for work provided by Institute of New Materials, Guangdong Academy of Sciences (PI: MMA, grant: 17-0551).",

year = "2022",

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doi = "10.1016/j.matlet.2021.131448",

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AU - Kong, Weihuan

AU - Shi, Qi

AU - Cox, Sophie C.

AU - Kuang, Min

AU - Attallah, Moataz M.

N1 - Funding Information: MMA acknowledges the financial support for work provided by Institute of New Materials, Guangdong Academy of Sciences (PI: MMA, grant: 17-0551).

PY - 2022/2/15

Y1 - 2022/2/15

N2 - Ti-34Nb-13Ta-5Zr-0.2O alloy (hereafter termed TNT5Zr-0.2O) with keyhole defects was fabricated by SLM. The microstructure and tensile properties have been investigated after two post-processing treatments, namely vacuum heat treatment (HT) and hot isostatic pressing (HIP). Microstructure shows both alloys retain beta grain matrix along with discrete nano-sized grain boundary alpha precipitates. The stress concentrations at the edge of keyholes make the voids wall collapse under tension and cracks propagate more easily in that region. Notably, the pore enclosure by HIP is not contribute to a better ductility of this alloy. This explains why the TNT5Zr-0.2O-HT alloy possesses lower UTS (978 ± 19 MPa) and elastic modulus (49 ± 3 GPa), but higher elongation (4.5% ± 0.6%) in comparison with TNT5Zr-0.2O-HIP sample.

AB - Ti-34Nb-13Ta-5Zr-0.2O alloy (hereafter termed TNT5Zr-0.2O) with keyhole defects was fabricated by SLM. The microstructure and tensile properties have been investigated after two post-processing treatments, namely vacuum heat treatment (HT) and hot isostatic pressing (HIP). Microstructure shows both alloys retain beta grain matrix along with discrete nano-sized grain boundary alpha precipitates. The stress concentrations at the edge of keyholes make the voids wall collapse under tension and cracks propagate more easily in that region. Notably, the pore enclosure by HIP is not contribute to a better ductility of this alloy. This explains why the TNT5Zr-0.2O-HT alloy possesses lower UTS (978 ± 19 MPa) and elastic modulus (49 ± 3 GPa), but higher elongation (4.5% ± 0.6%) in comparison with TNT5Zr-0.2O-HIP sample.

KW - Beta Ti alloy

KW - Keyhole

KW - Microstructure

KW - Selective laser melting

KW - Tensile properties

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Microstructure, tensile properties of SLMed TNT5Zr-0.2O alloys without/with keyholes produced by different Post-processing treatments

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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