MAX phases, include Ti_3SiC_2, Ti_2AlC etc, are machinable ternary carbides or nitrides with excellent properties. These materials, however, have obvious nonlinear elastic deformation due to nano-layered crystal structure. The stress-strain curves of cyclically load-unload test have obvious hysteretic loops. Because of this mechanical hysteresis, the strain of MAX phases at one time is not determined only by the stress applied to the sample at this time. Here the influence of grain size, chemical composition and porosity on the nonlinear elastic strain was introduced. Because of two properties of this hysteresis: wiping out and congruency, the classic hysteretic mathematic model (Preisach-Mayergoyz model, P-M model) can be applied to calculate the strain of MAX phases after any complex deformation history.
MAX phasesnonlinear elasticityP-M modelmechanical hysteresis
Aiguo Zhou、M. W. Barsoum
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School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454100, China Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA
Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA
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