Crack nucleation and elastic / plastic deformation of TiAl alloys investigated by in-situ loaded atomic force microscopy

被引：20

作者：

Iqbal, F. ^{[1
]}

Pyczak, F. ^{[1
]}

Neumeier, S. ^{[1
]}

Goeken, M. ^{[1
]}

机构：

[1] Friedrich AlexanderUniv Erlangen Nurnberg FAU, Inst 1, Mat Sci & Engn, Erlangen, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 689卷

关键词：

TiAl; Crack nucleation; In-situ observation; AFM; Elastic/plastic deformation; GAMMA-TITANIUM ALUMINIDES; PST-CRYSTALS; FRACTURE MECHANISMS; LAMELLAR; BEHAVIOR; MICROSTRUCTURE; PROPAGATION; SINGLE; GROWTH; TEM;

D O I：

10.1016/j.msea.2017.02.017

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The crack propagation mechanisms of gamma-titanium aluminides with fully lamellar microstructure have been studied using in-situ deformation in the Atomic Force Microscope (AFM). AFM demonstrated the unique capability to detect elastic as well as plastic deformation during in-situ tests from topography changes on the surface. It was found that the crack nucleation, which can occur at gamma/gamma and alpha 2/y interfaces as well as inside the gamma-phase, is always preceded by strong local elastic deformation. No cracking inside the alpha 2-phase was observed. The elastic and plastic deformation was confined inside the gamma-phase and especially pronounced near interfaces which can be explained by the differences of the elastic and plastic deformation behavior of the gamma-and alpha 2-phase.

引用

页码：11 / 16

页数：6

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