The effect of residual stresses and strain reversal on the fracture toughness of TiAl alloys

被引：27

作者：

Appel, Fritz ^{[1
]}

Paul, Jonathan D. H. ^{[1
]}

Staron, Peter ^{[1
]}

Oehring, Michael ^{[1
]}

Kolednik, Otmar ^{[2
]}

Predan, Jozef ^{[3
]}

Fischer, Franz Dieter ^{[4
]}

机构：

[1] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

[2] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria

[3] Univ Maribor, Fac Mech Engn, SI-2000 Maribor, Slovenia

[4] Univ Leoben, Inst Mech, A-8700 Leoben, Austria

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 709卷

关键词：

Titanium aluminides; Fracture behaviour; X-ray analysis; Finite element analysis; Intermetallics; Plasticity; Residual stresses; ALUMINIDE ALLOYS; ELASTIC-MODULI; PST-CRYSTALS; DEFORMATION; MICROSTRUCTURE; BEHAVIOR; FATIGUE; TEMPERATURE; COHERENCY; LAMELLAE;

D O I：

10.1016/j.msea.2017.10.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of local deformation on the fracture behaviour of TiAl alloys was investigated. Roller indentations impressed parallel to the crack plane significantly improve the fracture toughness. The residual strains present in the indentation zone were characterized by X-ray diffraction and modelled using finite element (FE) calculations. The experimentally observed macrostrains exhibit remarkable crystallographic anisotropies and are unequally shared between the major alloy constituents. The mechanisms behind the observed toughening have been discussed in terms of the residual strains and factors improving the crack tip plasticity. With regard to intended high-temperature applications, the temperature retention of the toughening effect was studied.

引用

页码：17 / 29

页数：13

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