Effect of strain-rate on the deformation response of D03-ordered Fe3Al

被引：17

作者：

Janda, D. ^{[1
]}

Ghassemi-Armaki, H. ^{[1
]}

Bruder, E. ^{[2
]}

Hockauf, M. ^{[3
]}

Heilmaier, M. ^{[4
]}

Kumar, K. S. ^{[1
]}

机构：

[1] Brown Univ, Sch Engn, Providence, RI 02912 USA

[2] Tech Univ Darmstadt, Dept Mat Sci, Div Phys Met, D-64287 Darmstadt, Germany

[3] Chemnitzer Werkstoff & Oberflachentech GmbH, D-09119 Chemnitz, Germany

[4] Karlsruhe Inst Technol, Inst Appl Mat IAM WK, D-76131 Karlsruhe, Germany

来源：

ACTA MATERIALIA | 2016年 / 103卷

关键词：

Iron aluminide; Strain rate; Shear localization; Twinning; Work-hardening; ADIABATIC SHEAR BANDS; IRON-ALUMINUM ALLOYS; AL SINGLE-CRYSTALS; YIELD STRESS; FLOW-STRESS; BEHAVIOR; PSEUDOELASTICITY; TEMPERATURE; STEEL; NB;

D O I：

10.1016/j.actamat.2015.11.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanical response of centrifugally cast Fe(3)A1 with the composition Fe-27A1 (at.%) containing microalloying additions of Nb, Zr, C, and B was investigated over a wide range of strain rates between 10(-4) and 10(3) s(-1) at room temperature. Tests were carried out in compression using a (i) screw-driven load frame, (ii) drop impact tester, and (iii) split-Hopkinson pressure bar at quasi-static, intermediate and dynamic strain rates respectively. Post deformation analysis was carried out by DSC, SEM/EBSD, TEM and micropillar deformation. In all instances, the stress-strain curves show initial hardening (-first 5% plastic strain) followed by a plateau in stress. A loss in work-hardening occurs at the highest strain rates examined (>10(3) s(-1)) and is likely associated with shear localization; in addition, (2 11) [11 1]-type twinning was observed at these high strain rates at room temperature. This observation is in line with previous theoretical calculations of the antiphase boundary (APB) energy. The consequence of a continuously increasing yield stress with strain rate and a loss in work hardening at the highest strain rates together yields a maximum in flow stress at the intermediate strain rate. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：909 / 918

页数：10

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