ZrB2 based novel composite with NiAl as reinforcement phase

J. K. Sonber; Murthy Tammana; K. Sairam; A. Nagaraj; S. Majumdar; V. Kain

doi:10.1016/j.ijrmhm.2017.09.013

ZrB₂ based novel composite with NiAl as reinforcement phase

J. K. Sonber^*, Murthy Tammana, K. Sairam, A. Nagaraj, S. Majumdar, V. Kain

^*Corresponding author for this work

Metallurgy and Materials

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

11 Citations (Scopus)

Abstract

ZrB₂ based novel composites have been prepared using NiAl as reinforcement phase. Three samples of compositions (a) ZrB₂ + 5%NiAl (a) ZrB₂ + 10%NiAl (a) ZrB₂ + 20%NiAl were prepared by hot pressing at 1700 °C. All the three samples were densified to a density of > 94% of its theoretical value. Addition of NiAl resulted in liquid phase sintering and assisted in densification. The composite was characterized by mechanical property measurement and microstructure analysis. Flexural strength of the composite was found to be in the range of 421 to 438 MPa. Hardness of composite was found to decrease with addition of NiAl. Indentation fracture toughness was found to increase with increasing NiAl content. Microstructural characterization revealed the uniform distribution of NiAl phase in ZrB₂ matrix. Grain coarsening was observed in composite with higher NiAl content. Fracture surface analysis revealed that the mode of fracture is transgranular. Microstructure analysis of crack propagation revealed the presence of crack bridging and crack arrest near NiAl phase, which resulted in higher fracture toughness of 6.8 MPa·m^1/2. Isothermal oxidation study at 1400 °C revealed that the developed composite has good oxidation resistance.

Original language	English
Pages (from-to)	56-65
Number of pages	10
Journal	International Journal of Refractory Metals and Hard Materials
Volume	70
Early online date	22 Sept 2017
DOIs	https://doi.org/10.1016/j.ijrmhm.2017.09.013
Publication status	Published - 1 Jan 2018

Keywords

Composite
Hot pressing
Mechanical properties
Microstructure
NiAl
ZrB

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Cite this

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title = "ZrB2 based novel composite with NiAl as reinforcement phase",

abstract = "ZrB2 based novel composites have been prepared using NiAl as reinforcement phase. Three samples of compositions (a) ZrB2 + 5%NiAl (a) ZrB2 + 10%NiAl (a) ZrB2 + 20%NiAl were prepared by hot pressing at 1700 °C. All the three samples were densified to a density of > 94% of its theoretical value. Addition of NiAl resulted in liquid phase sintering and assisted in densification. The composite was characterized by mechanical property measurement and microstructure analysis. Flexural strength of the composite was found to be in the range of 421 to 438 MPa. Hardness of composite was found to decrease with addition of NiAl. Indentation fracture toughness was found to increase with increasing NiAl content. Microstructural characterization revealed the uniform distribution of NiAl phase in ZrB2 matrix. Grain coarsening was observed in composite with higher NiAl content. Fracture surface analysis revealed that the mode of fracture is transgranular. Microstructure analysis of crack propagation revealed the presence of crack bridging and crack arrest near NiAl phase, which resulted in higher fracture toughness of 6.8 MPa·m1/2. Isothermal oxidation study at 1400 °C revealed that the developed composite has good oxidation resistance.",

keywords = "Composite, Hot pressing, Mechanical properties, Microstructure, NiAl, ZrB",

author = "Sonber, {J. K.} and Murthy Tammana and K. Sairam and A. Nagaraj and S. Majumdar and V. Kain",

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T1 - ZrB2 based novel composite with NiAl as reinforcement phase

AU - Sonber, J. K.

AU - Tammana, Murthy

AU - Sairam, K.

AU - Nagaraj, A.

AU - Majumdar, S.

AU - Kain, V.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - ZrB2 based novel composites have been prepared using NiAl as reinforcement phase. Three samples of compositions (a) ZrB2 + 5%NiAl (a) ZrB2 + 10%NiAl (a) ZrB2 + 20%NiAl were prepared by hot pressing at 1700 °C. All the three samples were densified to a density of > 94% of its theoretical value. Addition of NiAl resulted in liquid phase sintering and assisted in densification. The composite was characterized by mechanical property measurement and microstructure analysis. Flexural strength of the composite was found to be in the range of 421 to 438 MPa. Hardness of composite was found to decrease with addition of NiAl. Indentation fracture toughness was found to increase with increasing NiAl content. Microstructural characterization revealed the uniform distribution of NiAl phase in ZrB2 matrix. Grain coarsening was observed in composite with higher NiAl content. Fracture surface analysis revealed that the mode of fracture is transgranular. Microstructure analysis of crack propagation revealed the presence of crack bridging and crack arrest near NiAl phase, which resulted in higher fracture toughness of 6.8 MPa·m1/2. Isothermal oxidation study at 1400 °C revealed that the developed composite has good oxidation resistance.

AB - ZrB2 based novel composites have been prepared using NiAl as reinforcement phase. Three samples of compositions (a) ZrB2 + 5%NiAl (a) ZrB2 + 10%NiAl (a) ZrB2 + 20%NiAl were prepared by hot pressing at 1700 °C. All the three samples were densified to a density of > 94% of its theoretical value. Addition of NiAl resulted in liquid phase sintering and assisted in densification. The composite was characterized by mechanical property measurement and microstructure analysis. Flexural strength of the composite was found to be in the range of 421 to 438 MPa. Hardness of composite was found to decrease with addition of NiAl. Indentation fracture toughness was found to increase with increasing NiAl content. Microstructural characterization revealed the uniform distribution of NiAl phase in ZrB2 matrix. Grain coarsening was observed in composite with higher NiAl content. Fracture surface analysis revealed that the mode of fracture is transgranular. Microstructure analysis of crack propagation revealed the presence of crack bridging and crack arrest near NiAl phase, which resulted in higher fracture toughness of 6.8 MPa·m1/2. Isothermal oxidation study at 1400 °C revealed that the developed composite has good oxidation resistance.

KW - Composite

KW - Hot pressing

KW - Mechanical properties

KW - Microstructure

KW - NiAl

KW - ZrB

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