TY - JOUR AU - Takaya, S. AU - Uematsu, Y. AU - Kakiuchi, T. PY - 2015/09/28 Y2 - 2024/03/29 TI - EBSD-assisted fractographic analysis of crack paths in magnesium alloy JF - Frattura ed Integrità Strutturale JA - Fra&IntStrut VL - 9 IS - 34 SE - Miscellanea DO - 10.3221/IGF-ESIS.34.39 UR - https://www.fracturae.com/index.php/fis/article/view/1590 SP - AB - <p>&nbsp;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<br>or twinning can operate during plastic deformation because critical resolved shear stresses of the other slip<br>systems such as pyramidal or prismatic slips are much higher than the basal slip. Thus sometimes characteristic<br>fracture surfaces are formed during stress corrosion cracking (SCC) or fatigue crack propagation (FCP) in Mg<br>alloys, where many parallel lines are formed. These lines are different from so-called fatigue striations, because<br>they are formed even under sustained load condition of SCC. Consequently, electron back scattered diffraction<br>(EBSD) technique was applied on the fracture surface, and the formation mechanism of parallel lines was<br>investigated. EBSD-assisted fractography had revealed that the characteristic parallel lines were formed due to<br>the operation of basal slips, not twining. It is considered that hydrogen-enhanced localized plasticity (HELP)<br>mechanism had been activated under corrosive environment.</p> ER -