Erratum to “Microstructure determined fracture behavior of a high Nb containing TiAl alloy” [Mater. Sci. Eng. A 666 (2016) 297–304]

The mechanical properties of Ti -48 Al -2 Cr -2 Nb alloy were discussed after the high temperature corrosion tests carried out with salt mixture of 75wt. % Na 2 SO 4 and 25wt. % NaCl at 800°C. The microstructure of the alloy after corrosion was observed by SEM and the fracture behavior of the corroded and uncorroded alloys was investigated by means of the three-point bending tests. It has been shown that the corrosion path was mainly along the lamellar structure and rough surface with a large number of corrosion pits formed during the high temperature corrosion. The experimental results also indicated that the bearing capacity of bending fracture descended evidently due to the molten salt corrosion at high temperature, which only had remarkable effects on the surface state of the alloy. The microcracks inside the alloy always propagated along the phase interfaces and grain boundaries while the corrosion pits on salt-deposited surface became the main crack initiation location in corroded alloy. The stress concentration caused by corrosion was considered as the essential reason of the property reduction, which decreased the energy barrier of crack nucleation and shortened the incubation period.

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Effects of microcrack-damage on fracture behavior of TiAl alloy part I displacement-controlled tensile test

Materials Science and Engineering A ◽

10.1016/j.msea.2007.06.055 ◽

2008 ◽

Vol 474 (1-2) ◽

pp. 1-14 ◽

Cited By ~ 6

Author(s):

R. Cao ◽

H. Zhu ◽

J.H. Chen ◽

J. Zhang ◽

H.J. Yao

Keyword(s):

Tensile Test ◽

Fracture Behavior ◽

Tial Alloy ◽

Alloy Part

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Microstructure determined fracture behavior of a high Nb containing TiAl alloy

Materials Science and Engineering A ◽

10.1016/j.msea.2016.04.074 ◽

2016 ◽

Vol 666 ◽

pp. 297-304 ◽

Cited By ~ 16

Author(s):

Zeen Wu ◽

Rui Hu ◽

Tiebang Zhang ◽

Huan Zhou ◽

Hongchao Kou ◽

...

Keyword(s):

Fracture Behavior ◽

Tial Alloy

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The Micro Crack Nucleation Rule and Fracture Behavior of Titanium Aluminum Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.496-500.396 ◽

2014 ◽

Vol 496-500 ◽

pp. 396-400

Author(s):

Xiang Bin Yi ◽

Zhi Yuan Rui ◽

Rui Cheng Feng ◽

Chang Feng Yan ◽

Yan Rui Zuo

Keyword(s):

Fracture Behavior ◽

Tial Alloy ◽

Crack Nucleation ◽

Distribution Model ◽

Tensile Fracture ◽

Dislocation Model ◽

Tial Alloys ◽

Quantitative Analysis Method ◽

Fracture Theory ◽

Strain Energy Density Theory

Study on tensile fracture behavior of TiAl alloy by means of the macro fracture theory and micro dislocation block theory. A quantitative analysis method of micro crack nucleation and crack mechanism for TiAl alloy is performed with the help of the dislocation distribution model, and is based on the strain energy density theory and criterion, a crack criterion of TiAl alloy instability is established. The experimental results confirmed that the dislocation model and S criterion on tensile fracture behavior of TiAl alloys are effective.

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In Situ Straining Tem Observation of Fracture behavior in Pst Crystals of TiAl

MRS Proceedings ◽

10.1557/proc-364-1047 ◽

1994 ◽

Vol 364 ◽

Cited By ~ 1

Author(s):

Mingwei Chen ◽

Da Chen ◽

Dongliang Lin

Keyword(s):

Stress Concentration ◽

Crack Propagation ◽

Crack Growth ◽

Fracture Behavior ◽

Tial Alloy ◽

Propagation Process ◽

Fracture Behaviors ◽

Crack Propagation Process ◽

Crack Tips

AbstractCrack propagation process in TiAl alloy PST crystal has been investigated by in situ straining TEM observation. It has been found that the influence of lamellar boundaries on the fracture behaviors is connected with the types of interfaces (twin, pseudo-twin and α2/γ interfaces). Even though secondary microcracks always nucleate at α2/γ interfaces due to stress concentration, the crack growth is cleavage in α2 and γ phases rather than along interlamellae. When a crack meet γ/γ interfaces, its propagation can be inhibited and crack tips blunt by the slide of the interfaces. It also deserves to be mentioned that ductility of PST crystals has connection with the rate of crack propagation..

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