Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature

Michael S. Kesler; Sonalika Goyel; Fereshteh Ebrahimi; Michele V. Manuel

doi:10.1016/j.jallcom.2016.11.181

Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature

Michael S. Kesler, Sonalika Goyel, Fereshteh Ebrahimi, Michele V. Manuel

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

17 Scopus citations

Abstract

The mechanical properties of novel alloys with two-phase γ-TiAl + σ-Nb₂Al microstructures were evaluated under compression at room temperature. Microstructures of varying scales were developed through solutionizing and aging heat treatments and the volume fraction of phases were varied with changes in composition. Ultra-fine, aged γ+σ microstructures were achieved for the alloys which effectively retained high volume fractions of the parent β-phase upon quenching from the solutionizing temperature. The yield strength and compressive strain to failure of these alloys show a strong dependence on the relative scale and volume fraction of phases. Surprisingly, the hard brittle σ-phase particles were not found to control fracture in the refined microstructures.

Original language	English
Pages (from-to)	2672-2681
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	695
DOIs	https://doi.org/10.1016/j.jallcom.2016.11.181
State	Published - 2017
Externally published	Yes

Funding

This research was supported by the National Science Foundation under the grant number DMR-0856622.

Keywords

Age hardening
Inhomogeneous deformation
Mechanical properties
Titanium aluminides

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10.1016/j.jallcom.2016.11.181

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title = "Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature",

abstract = "The mechanical properties of novel alloys with two-phase γ-TiAl + σ-Nb2Al microstructures were evaluated under compression at room temperature. Microstructures of varying scales were developed through solutionizing and aging heat treatments and the volume fraction of phases were varied with changes in composition. Ultra-fine, aged γ+σ microstructures were achieved for the alloys which effectively retained high volume fractions of the parent β-phase upon quenching from the solutionizing temperature. The yield strength and compressive strain to failure of these alloys show a strong dependence on the relative scale and volume fraction of phases. Surprisingly, the hard brittle σ-phase particles were not found to control fracture in the refined microstructures.",

keywords = "Age hardening, Inhomogeneous deformation, Mechanical properties, Titanium aluminides",

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year = "2017",

doi = "10.1016/j.jallcom.2016.11.181",

language = "English",

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T1 - Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature

AU - Kesler, Michael S.

AU - Goyel, Sonalika

AU - Ebrahimi, Fereshteh

AU - Manuel, Michele V.

PY - 2017

Y1 - 2017

N2 - The mechanical properties of novel alloys with two-phase γ-TiAl + σ-Nb2Al microstructures were evaluated under compression at room temperature. Microstructures of varying scales were developed through solutionizing and aging heat treatments and the volume fraction of phases were varied with changes in composition. Ultra-fine, aged γ+σ microstructures were achieved for the alloys which effectively retained high volume fractions of the parent β-phase upon quenching from the solutionizing temperature. The yield strength and compressive strain to failure of these alloys show a strong dependence on the relative scale and volume fraction of phases. Surprisingly, the hard brittle σ-phase particles were not found to control fracture in the refined microstructures.

AB - The mechanical properties of novel alloys with two-phase γ-TiAl + σ-Nb2Al microstructures were evaluated under compression at room temperature. Microstructures of varying scales were developed through solutionizing and aging heat treatments and the volume fraction of phases were varied with changes in composition. Ultra-fine, aged γ+σ microstructures were achieved for the alloys which effectively retained high volume fractions of the parent β-phase upon quenching from the solutionizing temperature. The yield strength and compressive strain to failure of these alloys show a strong dependence on the relative scale and volume fraction of phases. Surprisingly, the hard brittle σ-phase particles were not found to control fracture in the refined microstructures.

KW - Age hardening

KW - Inhomogeneous deformation

KW - Mechanical properties

KW - Titanium aluminides

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SN - 0925-8388

VL - 695

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature

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