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

被引：13

作者：

Kesler, Michael S. ^{[1
]}

Goyel, Sonalika ^{[1
]}

Ebrahimi, Fereshteh ^{[1
]}

Manuel, Michele V. ^{[1
]}

机构：

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

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 695卷

基金：

美国国家科学基金会;

关键词：

Titanium aluminides; Age hardening; Mechanical properties; Inhomogeneous deformation; PHASE-TRANSFORMATION; NB; FRACTURE; DEFORMATION; STRENGTH;

D O I：

10.1016/j.jallcom.2016.11.181

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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.

引用

页码：2672 / 2681

页数：10

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