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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:695

Article

Kesler, Michael S.¹  Goyel, Sonalika¹  Ebrahimi, Fereshteh¹  Manuel, Michele V.¹ 

[1] Univ Florida, Mat Sci & Engn, POB 116400, Gainesville, FL 32611 USA

关键词: Titanium aluminides;    Age hardening;    Mechanical properties;    Inhomogeneous deformation;   

DOI  :  10.1016/j.jallcom.2016.11.181

来源: Elsevier

【 摘 要 】

The mechanical properties of novel alloys with two-phase gamma-TiAl + sigma-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 gamma+sigma microstructures were achieved for the alloys which effectively retained high volume fractions of the parent beta-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 sigma-phase particles were not found to control fracture in the refined microstructures. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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