Laves phase intermetallic matrix composite in situ toughened by ductile precipitates

Alexander J. Knowles; Ayan Bhowmik; Surajit Purkayastha; Nicholas G. Jones; Finn Giuliani; William J. Clegg; David Dye; Howard J. Stone

doi:10.1016/j.scriptamat.2017.06.043

Laves phase intermetallic matrix composite in situ toughened by ductile precipitates

Alexander J. Knowles^*, Ayan Bhowmik, Surajit Purkayastha, Nicholas G. Jones, Finn Giuliani, William J. Clegg, David Dye, Howard J. Stone

^*Corresponding author for this work

Metallurgy and Materials

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

13 Citations (Scopus)

Abstract

Laves phase based materials are of interest for elevated temperature applications for their high melting points and strengths but are critically limited by their low fracture toughness. Here, a Laves phase intermetallic matrix composite toughened by ductile precipitates has been studied. This microstructure was produced in situ by heat treating a Fe₂(Mo,Ti) based alloy to precipitate ∼ 12% volume fraction of fine ∼ 250 nm bcc, A2 (Mo,Ti), phase, with an orientation relationship of [100]_C14//[113]_A2,[010]_C14//[11¯1¯]_A2,[001]_C14//[121¯]_A2. The precipitated A2 phase increased the indentation fracture toughness from 1.1 to 2.2 MPa m^1/2 while maintaining a high hardness of HV_0.5 = 8.9 GPa similar to monolithic Laves phases.

Original language	English
Pages (from-to)	59-62
Number of pages	4
Journal	Scripta Materialia
Volume	140
Early online date	14 Jul 2017
DOIs	https://doi.org/10.1016/j.scriptamat.2017.06.043
Publication status	Published - 1 Nov 2017

Keywords

Composites
Intermetallics
Mechanical properties
Orientation relationship
Precipitation

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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10.1016/j.scriptamat.2017.06.043

https://spiral.imperial.ac.uk/handle/10044/1/50320

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title = "Laves phase intermetallic matrix composite in situ toughened by ductile precipitates",

abstract = "Laves phase based materials are of interest for elevated temperature applications for their high melting points and strengths but are critically limited by their low fracture toughness. Here, a Laves phase intermetallic matrix composite toughened by ductile precipitates has been studied. This microstructure was produced in situ by heat treating a Fe2(Mo,Ti) based alloy to precipitate ∼ 12% volume fraction of fine ∼ 250 nm bcc, A2 (Mo,Ti), phase, with an orientation relationship of [100]C14//[113]A2,[010]C14//[11¯1¯]A2,[001]C14//[121¯]A2. The precipitated A2 phase increased the indentation fracture toughness from 1.1 to 2.2 MPa m1/2 while maintaining a high hardness of HV0.5 = 8.9 GPa similar to monolithic Laves phases.",

keywords = "Composites, Intermetallics, Mechanical properties, Orientation relationship, Precipitation",

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AU - Knowles, Alexander J.

AU - Bhowmik, Ayan

AU - Purkayastha, Surajit

AU - Jones, Nicholas G.

AU - Giuliani, Finn

AU - Clegg, William J.

AU - Dye, David

AU - Stone, Howard J.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Laves phase based materials are of interest for elevated temperature applications for their high melting points and strengths but are critically limited by their low fracture toughness. Here, a Laves phase intermetallic matrix composite toughened by ductile precipitates has been studied. This microstructure was produced in situ by heat treating a Fe2(Mo,Ti) based alloy to precipitate ∼ 12% volume fraction of fine ∼ 250 nm bcc, A2 (Mo,Ti), phase, with an orientation relationship of [100]C14//[113]A2,[010]C14//[11¯1¯]A2,[001]C14//[121¯]A2. The precipitated A2 phase increased the indentation fracture toughness from 1.1 to 2.2 MPa m1/2 while maintaining a high hardness of HV0.5 = 8.9 GPa similar to monolithic Laves phases.

AB - Laves phase based materials are of interest for elevated temperature applications for their high melting points and strengths but are critically limited by their low fracture toughness. Here, a Laves phase intermetallic matrix composite toughened by ductile precipitates has been studied. This microstructure was produced in situ by heat treating a Fe2(Mo,Ti) based alloy to precipitate ∼ 12% volume fraction of fine ∼ 250 nm bcc, A2 (Mo,Ti), phase, with an orientation relationship of [100]C14//[113]A2,[010]C14//[11¯1¯]A2,[001]C14//[121¯]A2. The precipitated A2 phase increased the indentation fracture toughness from 1.1 to 2.2 MPa m1/2 while maintaining a high hardness of HV0.5 = 8.9 GPa similar to monolithic Laves phases.

KW - Composites

KW - Intermetallics

KW - Mechanical properties

KW - Orientation relationship

KW - Precipitation

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DO - 10.1016/j.scriptamat.2017.06.043

M3 - Article

AN - SCOPUS:85023605965

SN - 1359-6462

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EP - 62

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Laves phase intermetallic matrix composite in situ toughened by ductile precipitates

Abstract

Keywords

ASJC Scopus subject areas

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