EBSD-assisted fractographic analysis of crack paths in magnesium alloy
Journal Title: Frattura ed Integrità Strutturale - Year 2015, Vol 9, Issue 34
Abstract
Magnesium (Mg) alloys are attractive as structural materials due to their light weight and high specific strength. It is well known that Mg alloy has hexagonal close-packed (HCP) structure and only basal slip or twinning can operate during plastic deformation because critical resolved shear stresses of the other slip systems such as pyramidal or prismatic slips are much higher than the basal slip. Thus sometimes characteristic fracture surfaces are formed during stress corrosion cracking (SCC) or fatigue crack propagation (FCP) in Mg alloys, where many parallel lines are formed. These lines are different from so-called fatigue striations, because they are formed even under sustained load condition of SCC. Consequently, electron back scattered diffraction (EBSD) technique was applied on the fracture surface, and the formation mechanism of parallel lines was investigated. EBSD-assisted fractography had revealed that the characteristic parallel lines were formed due to the operation of basal slips, not twining. It is considered that hydrogen-enhanced localized plasticity (HELP) mechanism had been activated under corrosive environment.
Authors and Affiliations
S. Takaya, Y. Uematsu, T. Kakiuchi
Keywords
Related Articles
- EP ID EP143575
- DOI 10.3221/IGF-ESIS.34.39
- Views 59
- Downloads 0
Inter-laminar shear stress in hybrid CFRP/austenitic steel
Bolted joints are the most common solution for joining composite components in aerospace structures. Critical structures such as wing to fuselage joints, or flight control surface fittings use bolted joining tech...
Mechanical behaviour of wood T-joints. Experimental and numerical investigation
Results of a double-shear single-dowel wood connection tested under monotonic quasi-static compression loading are presented and discussed in this paper. The wood used in this study was a pine wood, namely the Pi...
Time and frequency domain models for multiaxial fatigue life estimation under random loading
Engineering structures and components are often subjected to random fatigue loading produced, for example, by wind turbulences, marine waves and vibrations. The methods available in the literature for fatigue ass...
Studio del danneggiamento mediante tomografia in luce del sincrotrone: impatto di un cono d’ombra sulla qualità finale delle ricostruzioni
Un’accurata osservazione della geometria tridimensionale di cricche e difetti è necessaria per lo studio dei meccanismi alla base del processo di danneggiamento. I metodi convenzionali utilizzati a questo scopo sono dist...
A numerical approach for the analysis of deformable journal bearings
This paper presents a numerical approach for the analysis of hydrodynamic radial journal bearings. The effect of shaft and housing elastic deformation on pressure distribution within oil film is investigated. An it...