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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

The mechanical properties of novel alloys with two-phase γ-TiAl + σ-Nb 2Al 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 affectively 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.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; DMR-0856622
Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 695; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1394482

Kesler, Michael S., Goyel, Sonalika, Ebrahimi, Fereshteh, and Manuel, Michele V.. Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature. United States: N. p., Web. doi:10.1016/j.jallcom.2016.11.181.
Kesler, Michael S., Goyel, Sonalika, Ebrahimi, Fereshteh, & Manuel, Michele V.. Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature. United States. doi:10.1016/j.jallcom.2016.11.181.
Kesler, Michael S., Goyel, Sonalika, Ebrahimi, Fereshteh, and Manuel, Michele V.. 2016. "Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature". United States. doi:10.1016/j.jallcom.2016.11.181. https://www.osti.gov/servlets/purl/1394482.
@article{osti_1394482,
title = {Effect of microstructural parameters on the mechanical behavior of TiAlNb(Cr,Mo) alloys with γ+σ microstructure at ambient temperature},
author = {Kesler, Michael S. and Goyel, Sonalika and Ebrahimi, Fereshteh and Manuel, Michele V.},
abstractNote = {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 affectively 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.},
doi = {10.1016/j.jallcom.2016.11.181},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 695,
place = {United States},
year = {2016},
month = {11}
}