Effect of gallium addition on the microstructure and micromechanical properties of constituents in Nb[sbnd]Si based alloys

Enyu Guo; Sudhanshu S. Singh; Carl Mayer; Xianyu Meng; Yanjin Xu; Liangshun Luo; Mingyue Wang; Nikhilesh Chawla

doi:10.1016/j.jallcom.2017.02.054

Effect of gallium addition on the microstructure and micromechanical properties of constituents in Nb[sbnd]Si based alloys

Enyu Guo, Sudhanshu S. Singh, Carl Mayer, Xianyu Meng, Yanjin Xu, Liangshun Luo, Mingyue Wang, Nikhilesh Chawla

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

36 Scopus citations

Abstract

The effect of gallium addition on the solidification microstructure and micromechanical properties of constituents was investigated in two sets of Nb[sbnd]16Si(1Ga) (in at.%) and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al[sbnd]2Hf(5Ga) (all in at.%) alloys. The addition of gallium was found to promote the formation of Nb₅Si₃and (Nb,Ti)₅Si₃phases in Nb[sbnd]16Si[sbnd]1Ga and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al-2Hf[sbnd]5Ga alloys, respectively. Evaluation of micromechanical properties of constituents were done by nanoindentation and micropillar compression testing. Nanoindentation showed that gallium addition reduces hardness and Young's modulus for both Nb_ssand silicide phases (Nb₃Si and (Nb,Ti)₅Si₃); while it enhances fracture toughness of silicide phases. However, micropillar compressions showed that the addition of gallium decreases the compressive strength of the Nb_ssphase while increasing the strength of the silicides.

Original language	English (US)
Pages (from-to)	89-100
Number of pages	12
Journal	Journal of Alloys and Compounds
Volume	704
DOIs	https://doi.org/10.1016/j.jallcom.2017.02.054
State	Published - 2017

Keywords

Fracture toughness
Intermetallic
Mechanical property
Micropillar compression
Nb[sbnd]Si alloy

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2017.02.054

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title = "Effect of gallium addition on the microstructure and micromechanical properties of constituents in Nb[sbnd]Si based alloys",

abstract = "The effect of gallium addition on the solidification microstructure and micromechanical properties of constituents was investigated in two sets of Nb[sbnd]16Si(1Ga) (in at.%) and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al[sbnd]2Hf(5Ga) (all in at.%) alloys. The addition of gallium was found to promote the formation of Nb5Si3and (Nb,Ti)5Si3phases in Nb[sbnd]16Si[sbnd]1Ga and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al-2Hf[sbnd]5Ga alloys, respectively. Evaluation of micromechanical properties of constituents were done by nanoindentation and micropillar compression testing. Nanoindentation showed that gallium addition reduces hardness and Young's modulus for both Nbssand silicide phases (Nb3Si and (Nb,Ti)5Si3); while it enhances fracture toughness of silicide phases. However, micropillar compressions showed that the addition of gallium decreases the compressive strength of the Nbssphase while increasing the strength of the silicides.",

keywords = "Fracture toughness, Intermetallic, Mechanical property, Micropillar compression, Nb[sbnd]Si alloy",

author = "Enyu Guo and Singh, {Sudhanshu S.} and Carl Mayer and Xianyu Meng and Yanjin Xu and Liangshun Luo and Mingyue Wang and Nikhilesh Chawla",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

doi = "10.1016/j.jallcom.2017.02.054",

language = "English (US)",

volume = "704",

pages = "89--100",

journal = "Journal of Alloys and Compounds",

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T1 - Effect of gallium addition on the microstructure and micromechanical properties of constituents in Nb[sbnd]Si based alloys

AU - Guo, Enyu

AU - Singh, Sudhanshu S.

AU - Mayer, Carl

AU - Meng, Xianyu

AU - Xu, Yanjin

AU - Luo, Liangshun

AU - Wang, Mingyue

AU - Chawla, Nikhilesh

PY - 2017

Y1 - 2017

N2 - The effect of gallium addition on the solidification microstructure and micromechanical properties of constituents was investigated in two sets of Nb[sbnd]16Si(1Ga) (in at.%) and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al[sbnd]2Hf(5Ga) (all in at.%) alloys. The addition of gallium was found to promote the formation of Nb5Si3and (Nb,Ti)5Si3phases in Nb[sbnd]16Si[sbnd]1Ga and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al-2Hf[sbnd]5Ga alloys, respectively. Evaluation of micromechanical properties of constituents were done by nanoindentation and micropillar compression testing. Nanoindentation showed that gallium addition reduces hardness and Young's modulus for both Nbssand silicide phases (Nb3Si and (Nb,Ti)5Si3); while it enhances fracture toughness of silicide phases. However, micropillar compressions showed that the addition of gallium decreases the compressive strength of the Nbssphase while increasing the strength of the silicides.

AB - The effect of gallium addition on the solidification microstructure and micromechanical properties of constituents was investigated in two sets of Nb[sbnd]16Si(1Ga) (in at.%) and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al[sbnd]2Hf(5Ga) (all in at.%) alloys. The addition of gallium was found to promote the formation of Nb5Si3and (Nb,Ti)5Si3phases in Nb[sbnd]16Si[sbnd]1Ga and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al-2Hf[sbnd]5Ga alloys, respectively. Evaluation of micromechanical properties of constituents were done by nanoindentation and micropillar compression testing. Nanoindentation showed that gallium addition reduces hardness and Young's modulus for both Nbssand silicide phases (Nb3Si and (Nb,Ti)5Si3); while it enhances fracture toughness of silicide phases. However, micropillar compressions showed that the addition of gallium decreases the compressive strength of the Nbssphase while increasing the strength of the silicides.

KW - Fracture toughness

KW - Intermetallic

KW - Mechanical property

KW - Micropillar compression

KW - Nb[sbnd]Si alloy

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Effect of gallium addition on the microstructure and micromechanical properties of constituents in Nb[sbnd]Si based alloys

Abstract

Keywords

ASJC Scopus subject areas

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