A nickel based superalloy reinforced by both Ni3Al and Ni3V ordered-fcc precipitates

Alexander J Knowles; Lucy Reynolds; Vassili A Vorontsov; David Dye

doi:10.1016/j.scriptamat.2018.12.013

A nickel based superalloy reinforced by both Ni₃Al and Ni₃V ordered-fcc precipitates

Alexander J Knowles, Lucy Reynolds, Vassili A Vorontsov, David Dye

Design, Manufacturing And Engineering Management

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Abstract

A nickel based superalloy has been designed where the fcc γ Ni matrix is reinforced by two different ordered-fcc intermetallic compounds, γ' L1₂Ni₃Al and γ'' D0₂₂ Ni₃V. Primary ageing at 900–1000 °C precipitated spherical L1₂ Ni₃Al, whose volume fraction and size were controlled by altering the ageing temperature and time. Secondary ageing at 700 °C for 1–1000 h precipitated D0₂₂ Ni₃V laths. The duplex precipitation increased hardness by up to 85 HV, with ∼ 500 MPa compressive proof strength maintained at 800 °C. Electron microscopy studied the Ni₃Al precipitation and confirmed the form of the secondary Ni₃V precipitates and their long term stability.

Original language	English
Pages (from-to)	472-476
Number of pages	5
Journal	Scripta Materialia
Volume	162
Early online date	21 Dec 2018
DOIs	https://doi.org/10.1016/j.scriptamat.2018.12.013
Publication status	Published - 15 Mar 2019

Keywords

superalloy
precipitation
intermetallics
microstructure
mechanical properties

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10.1016/j.scriptamat.2018.12.013

Knowles-etal-SM-2018-A-nickel-based-superalloy-reinforced-by-bothAccepted author manuscript, 16.9 MBLicence: CC BY-NC-ND 4.0

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title = "A nickel based superalloy reinforced by both Ni3Al and Ni3V ordered-fcc precipitates",

abstract = "A nickel based superalloy has been designed where the fcc γ Ni matrix is reinforced by two different ordered-fcc intermetallic compounds, γ' L12 Ni3Al and γ'' D022 Ni3V. Primary ageing at 900–1000 °C precipitated spherical L12 Ni3Al, whose volume fraction and size were controlled by altering the ageing temperature and time. Secondary ageing at 700 °C for 1–1000 h precipitated D022 Ni3V laths. The duplex precipitation increased hardness by up to 85 HV, with ∼ 500 MPa compressive proof strength maintained at 800 °C. Electron microscopy studied the Ni3Al precipitation and confirmed the form of the secondary Ni3V precipitates and their long term stability.",

keywords = "superalloy, precipitation, intermetallics, microstructure, mechanical properties",

author = "Knowles, {Alexander J} and Lucy Reynolds and Vorontsov, {Vassili A} and David Dye",

year = "2019",

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day = "15",

doi = "10.1016/j.scriptamat.2018.12.013",

language = "English",

volume = "162",

pages = "472--476",

journal = "Scripta Materialia",

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TY - JOUR

T1 - A nickel based superalloy reinforced by both Ni3Al and Ni3V ordered-fcc precipitates

AU - Knowles, Alexander J

AU - Reynolds, Lucy

AU - Vorontsov, Vassili A

AU - Dye, David

PY - 2019/3/15

Y1 - 2019/3/15

N2 - A nickel based superalloy has been designed where the fcc γ Ni matrix is reinforced by two different ordered-fcc intermetallic compounds, γ' L12 Ni3Al and γ'' D022 Ni3V. Primary ageing at 900–1000 °C precipitated spherical L12 Ni3Al, whose volume fraction and size were controlled by altering the ageing temperature and time. Secondary ageing at 700 °C for 1–1000 h precipitated D022 Ni3V laths. The duplex precipitation increased hardness by up to 85 HV, with ∼ 500 MPa compressive proof strength maintained at 800 °C. Electron microscopy studied the Ni3Al precipitation and confirmed the form of the secondary Ni3V precipitates and their long term stability.

AB - A nickel based superalloy has been designed where the fcc γ Ni matrix is reinforced by two different ordered-fcc intermetallic compounds, γ' L12 Ni3Al and γ'' D022 Ni3V. Primary ageing at 900–1000 °C precipitated spherical L12 Ni3Al, whose volume fraction and size were controlled by altering the ageing temperature and time. Secondary ageing at 700 °C for 1–1000 h precipitated D022 Ni3V laths. The duplex precipitation increased hardness by up to 85 HV, with ∼ 500 MPa compressive proof strength maintained at 800 °C. Electron microscopy studied the Ni3Al precipitation and confirmed the form of the secondary Ni3V precipitates and their long term stability.

KW - superalloy

KW - precipitation

KW - intermetallics

KW - microstructure

KW - mechanical properties

UR - https://www.sciencedirect.com/journal/scripta-materialia

U2 - 10.1016/j.scriptamat.2018.12.013

DO - 10.1016/j.scriptamat.2018.12.013

M3 - Article

SN - 1359-6462

VL - 162

SP - 472

EP - 476

JO - Scripta Materialia

JF - Scripta Materialia

ER -

A nickel based superalloy reinforced by both Ni₃Al and Ni₃V ordered-fcc precipitates

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