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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 13/2011

01.12.2011

In-Situ Fracture Observation and Fracture Toughness Analysis of Ni-Mn-Ga-Fe Ferromagnetic Shape Memory Alloys

verfasst von: Kwangjun Euh, Jung-Moo Lee, Duk-Hyun Nam, Sunghak Lee

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 13/2011

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Abstract

The fracture property improvement of Ni-Mn-Ga-Fe ferromagnetic shape memory alloys containing ductile γ particles was explained by direct observation of microfracture processes using an in-situ loading stage installed inside a scanning electron microscope (SEM) chamber. The Ni-Mn-Ga-Fe alloys contained a considerable amount of γ particles in β grains after the homogenization treatment at 1073 K to 1373 K (800 °C to 1100 °C). With increasing homogenization temperature, γ particles were coarsened and distributed homogeneously along β grain boundaries as well as inside β grains. According to the in-situ microfracture observation, γ particles effectively acted as blocking sites of crack propagation and provided the stable crack growth, which could be confirmed by the R-curve analysis. The increase in fracture resistance with increasing crack length improved overall fracture properties of the Ni-Mn-Ga-Fe alloys. This improvement could be explained by mechanisms of blocking of crack propagation and crack blunting and bridging.
Vorheriger Artikel Solute Behavior in the Initial Nucleation of V- and Nb-Containing Carbide
Nächster Artikel Quantitative Measurements of Grain Boundary Sliding in an Ultrafine-Grained Al Alloy by Atomic Force Microscopy

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Fußnoten
1
JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
 
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Metadaten
Titel
In-Situ Fracture Observation and Fracture Toughness Analysis of Ni-Mn-Ga-Fe Ferromagnetic Shape Memory Alloys
verfasst von
Kwangjun Euh
Jung-Moo Lee
Duk-Hyun Nam
Sunghak Lee
Publikationsdatum
01.12.2011
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 13/2011
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-011-0804-y

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