Inducement of kink-band formation in directionally solidified Mg/Mg17Al12 eutectic alloy - Inspired by the deformation behavior of the long-period stacking ordered (LPSO) phase

2020 ◽  
Vol 798 ◽  
pp. 140087
Author(s):  
Koji Hagihara ◽  
Kyohei Hayakawa ◽  
Kosuke Miyoshi
Keyword(s):  
Eutectic Alloy ◽  
Deformation Behavior ◽  
Kink Band ◽  
Directionally Solidified ◽  
Band Formation ◽  
Lpso Phase ◽  
Long Period

Deformation Behavior of LPSO Phase and Zn Accompanied by Kink Band Formation

PRICM ◽  
2013 ◽  
pp. 973-978
Author(s):  
Koji Hagihara ◽  
Yoshihiro Fukusumi ◽  
Michiaki Yamasaki ◽  
Ryosuke Matsumoto ◽  
Masahito Honnami ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
Kink Band ◽  
Band Formation ◽  
Lpso Phase

Deformation Behavior of Lpso Phase and Zn Accompanied by Kink Band Formation

2013 ◽  
pp. 973-978
Author(s):  
Koji Hagihara ◽  
Yoshihiro Fukusumi ◽  
Michiaki Yamasaki ◽  
Ryosuke Matsumoto ◽  
Masahito Honnami ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
Kink Band ◽  
Band Formation ◽  
Lpso Phase

A Dislocation-Based Crystal Plasticity Simulation on Kink Band Formation and Evolution in Polycrystalline Mg Alloy with LPSO Phase

2014 ◽  
Vol 626 ◽  
pp. 281-286 ◽  
Author(s):  
Ryo Ueta ◽  
Kazuyuki Shizawa
Keyword(s):  
Crystal Plasticity ◽  
Three Dimensional ◽  
Kink Band ◽  
Mg Alloy ◽  
Shear Stresses ◽  
Band Formation ◽  
Polycrystalline Specimen ◽  
Lpso Phase ◽  
Crystal Plasticity Model ◽  
Formation And Evolution

A three-dimensional compression analysis is performed by finite element method using a dislocation-based crystal plasticity model to clarify the formation mechanism of kink band in a polycrystalline Mg alloy with a long-period stacking ordered structure (LPSO) phase. The crystalline structure of LPSO phase is regarded as a HCP for simplicity, however, any deformation twinning is not taken into account. In addition, the activities of non-basal systems are considerably limited in the LPSO phase setting the values of their critical resolved shear stresses to large ones. We analyze a simple polycrystalline specimen composed of two α-Mg matrix phases and a LPSO phase both having a rectangular shape and twist grain boundaries are introduced into the interface. The obtained result shows that the kink band formation in the alloy is accomplished by the basal slips with different variants and the non-basal slips are activated on the grain boundary to maintain the continuity of deformation.

Microstructural Factors Affecting the Deformation Behavior of Mg12ZnY LPSO-Phase Alloys

2012 ◽  
Vol 706-709 ◽  
pp. 1158-1163 ◽  
Author(s):  
Koji Hagihara ◽  
Akihito Kinoshita ◽  
Yoshihiro Fukusumi ◽  
Michiaki Yamasaki ◽  
Yoshihito Kawamura
Keyword(s):  
Plastic Deformation ◽  
Yield Stress ◽  
Deformation Behavior ◽  
Basal Slip ◽  
The Other ◽  
Factors Affecting ◽  
Lpso Phase ◽  
Long Period ◽  
Other Hand

Microstructural factors that govern the plastic deformation of the long-period stacking ordered (LPSO) phase were clarified. The decrease in length of the long-axis for the plate-like shape of LPSO-phase grains increases the yield stress of the alloy in which basal slip is predominant in deformation. On the other hand, the yield stress tended to increase as the thickness of the plate-like shapes of the grains decreased for the alloy in which the formation of deformation kinks carried the strain.

Effect of a magnetic field on the banding phenomenon in aluminium–silicon eutectic alloy

1968 ◽  
Vol 46 (14) ◽  
pp. 1589-1595 ◽  
Author(s):  
E. A. Falquero ◽  
W. Saunders ◽  
W. V. Youdelis
Keyword(s):  
Magnetic Field ◽  
Eutectic Alloy ◽  
Solidification Rate ◽  
Magnetic Field Effect ◽  
Impurity Level ◽  
Directionally Solidified ◽  
Band Formation ◽  
Band Spacing ◽  
Solidification Speed ◽  
Solid Liquid Interface

The effect of a magnetic field on the frequency of transverse band formation in directionally solidified Al–Si eutectic alloy is investigated for a range of solidification speeds. The band spacing for both field and no-field ingots is found to be linearly dependent on the solidification rate, but for a given solidification speed a magnetic field of 30 000 Oe, applied perpendicular to the solidification direction, reduced the band spacing by approximately 35%. The results are explained in terms of the effects of the solidification rate and magnetic field on the impurity concentration ahead of the solid–liquid interface, a fluctuating impurity level being the direct cause of the banding phenomenon. It is shown that the magnetic-field effect on band spacing is consistent with the theories (previously published) developed to account for the observed effects of a magnetic field on alloy diffusion and solidification.

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