Characterization of the deformation behaviors associated with the serrated flow of a 5456 Al-based alloy using two orthogonal digital image correlation systems

Abstract The spatio-temporal characteristics associated with the Portevin–Le Chatelier (PLC) effect in a 5456 Al-based alloy were investigated by employing two orthogonal digital image correlation systems. This investigation yielded the first-ever experimental observations of the strain localization in the thickness direction, which was measured to be homogenous along the thickness of the specimen. In fact, this localization was more severe in the thickness plane than in the widthwise plane. This confirmed that the assumption of a plane-stress state is invalid for specimens, which are susceptible to the PLC effect. With respect to the deformation mode of the PLC bands, the localized region in the thickness and widthwise planes were actually in an unequal biaxial stress state and a state of simple shear, respectively. The deformation continuity of the boundary corresponding to the widthwise and thickness planes was discussed on the basis of the experimental data. Moreover, two different fracture modes, i.e., the shearing-to-opening mode and the pure shearing mode, were proposed. The aforementioned observations can provide new insights into the deformation behaviors of the plastic instabilities, especially as it relates to the numerical modeling of the morphology and propagation of the PLC band.

[1]  Qingchuan Zhang,et al.  On the propagation and pulsation of Portevin-Le Chatelier deformation bands: An experimental study with digital speckle pattern metrology , 2005 .

[2]  L. Casarotto,et al.  On nucleation and propagation of PLC bands in an Al–3Mg alloy , 2009 .

[3]  Qingchuan Zhang,et al.  Thermal analyses and simulations of the type A and type B Portevin–Le Chatelier effects in an Al–Mg alloy , 2012 .

[4]  F. Springer,et al.  A study of basic processes characterizing dynamic strain ageing , 1998 .

[5]  P. Manach,et al.  Relationship between Local Strain Jumps and Temperature Bursts Due to the Portevin-Le Chatelier Effect in an Al-Mg Alloy , 2013 .

[6]  P. Penning.  Mathematics of the portevin-le chatelier effect , 1972 .

[7]  Y. Estrin,et al.  The morphology of Portevin–Le Chatelier bands: finite element simulation for Al–Mg–Si , 2001 .

[8]  S. Boudrahem,et al.  The dynamics of Portevin–Le Chatelier bands in an Al–Mg alloy from infrared thermography , 2008 .

[9]  P. McCormick,et al.  Numerical Modelling of the Portevin Le Chatelier Effect , 1995 .

[10]  P. McCormick.  Theory of flow localisation due to dynamic strain ageing , 1988 .

[11]  Wei Tong,et al.  Detection of plastic deformation patterns in a binary aluminum alloy , 1997 .

[12]  Qingchuan Zhang,et al.  Study on the out-of-plane deformation of the Portevin-Le Chatelier band by using digital shearography , 2015 .

[13]  P. Hähner,et al.  Correlation of temporal instabilities and spatial localization during Portevin–LeChatelier deformation of Cu–10 at.% Al and Cu–15 at.% Al , 2000 .

[14]  W. Tong,et al.  Time-resolved strain mapping measurements of individual Portevin¿Le Chatelier deformation bands , 2005 .

[15]  Stephen F. Corbin,et al.  The influence of iron content on the plane strain fracture behaviour of AA 5754 Al–Mg sheet alloys , 2002 .

[16]  Xuedong Chen,et al.  Three types of Portevin–Le Chatelier effects: Experiment and modelling , 2007 .

[17]  A. Cottrell,et al.  LXXXVI. A note on the Portevin-Le Chatelier effect , 1953 .

[18]  J. Min,et al.  Spatio-temporal characteristics of propagative plastic instabilities in a rare earth containing magnesium alloy , 2014 .

[19]  D. Wagner,et al.  Experimental study by pyrometry of Portevin–Le Châtelier plastic instabilities—Type A to type B transition , 2008 .

[20]  T. Børvik,et al.  Effects of strain rate on the characteristics of PLC deformation bands for AA5083-H116 aluminium alloy , 2008 .

[21]  P. Vacher,et al.  Thermal observations associated with the Portevin–Le Châtelier effect in an Al–Mg alloy , 2005 .

[22]  Qingchuan Zhang,et al.  Effects of Various Shape Functions and Subset Size in Local Deformation Measurements Using DIC , 2015 .

[23]  Tore Børvik,et al.  An experimental and numerical investigation of the behaviour of AA5083 aluminium alloy in presence of the Portevin–Le Chatelier effect , 2008 .

[24]  H. Sehitoglu,et al.  Investigation using digital image correlation of Portevin-Le Chatelier Effect in Hastelloy X under thermo-mechanical loading , 2015 .

[25]  Qingchuan Zhang,et al.  Spatial characteristics of the Portevin-Le Chatelier deformation bands in Al-4 at%Cu polycrystals , 2005 .

[26]  D. Wilkinson,et al.  The Portevin-Le Chatelier (PLC) effect and shear band formation in an AA5754 alloy , 2007 .

[27]  G. Ananthakrishna,et al.  Correlation between band propagation property and the nature of serrations in the Portevin–Le Chatelier effect , 2015 .

[28]  Qingchuan Zhang,et al.  Time-resolved deformation measurements of the Portevin–Le Chatelier bands , 2007 .

[29]  Y. Estrin,et al.  Evolution of dislocation densities and the critical conditions for the Portevin-Le Châtelier effect , 1990 .

[30]  Xiaoping Wu,et al.  Fourier-based interpolation bias prediction in digital image correlation. , 2015, Optics express.

[31]  S. Kok,et al.  Spatial coupling in jerky flow using polycrystal plasticity , 2003 .

[32]  Hugh Alan Bruck,et al.  Full-field representation of discretely sampled surface deformation for displacement and strain analysis , 1991 .

[33]  Qingchuan Zhang,et al.  Spatiotemporal aspects of the Portevin–Le Chatelier effect in annealed and solution-treated aluminum alloys , 2006 .

[34]  Qingchuan Zhang,et al.  Influence of γʹ precipitates on Portevin–Le Chatelier effect of NI-based superalloys , 2015 .

[35]  Qingchuan Zhang,et al.  Two mechanisms for the normal and inverse behaviors of the critical strain for the Portevin–Le Chatelier effect , 2012 .

[36]  G. Ananthakrishna,et al.  A dynamical model for the Portevin-Le Chatelier bands , 2003 .