Complex investigation of deformation twinning in γ-TiAl by TEM and neutron diffraction

被引：16
作者：
Beran, Premysl [1 ]
Heczko, Milan [2 ]
Kruml, Tomas [2 ]
Panzner, Tobias [3 ]
van Petegem, Steven [4 ]
机构：
[1] ASCR, Inst Nucl Phys, Rez, Czech Republic
[2] ASCR, Inst Phys Mat, CEITEC, Brno, Czech Republic
[3] Paul Scherrer Inst, SINQ, Villigen, Switzerland
[4] Paul Scherrer Inst, Swiss Light Source, Villigen, Switzerland
来源：
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 2016年 / 95卷
关键词：
Dislocations; Twinning; Polycrystalline material; Neutron diffraction; Electron microscopy; ROOM-TEMPERATURE; TITANIUM ALUMINIDES; ALLOYS; FATIGUE; MO; DESIGN; CREEP; TWINS;
D O I：
10.1016/j.jmps.2016.05.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A near-gamma TiAl based alloy with 2 at% of Nb was investigated by means of collaborative research based on transmission electron microscopy and in-situ neutron diffraction techniques with the aim to study mechanical twinning and its role within the mechanisms governing fatigue response and material properties. In-situ neutron diffraction measurements were performed during low cycle fatigue straining at room temperature. Induced lattice strain related to the formation of deformation twins was detected and used to follow changes in the macroscopic material response caused by the twinning process during cycling. A microscopic insight was realised by using several transmission electron microscopy techniques to reveal in detail an internal deformation microstructure of the material at the beginning as well as at the end of the fatigue life. The study was focused on the first loading cycles where the material shows intense cyclic hardening. The effect of mechanical twinning on the material behaviour at several stages of the fatigue life is discussed for two different total strain amplitudes of 0.2% and 0.4%. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：647 / 662
页数：16
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