Experimental study of Portevin-Le Châtelier plastic instabilities by infrared pyrometry – Type A to type B transition

摘要: In general, at the macroscopic scale plastic strain in materials ishomogeneous. However, under certain conditions of temperature and strainrate, it can become heterogeneous. There is then localization plasticstrain. The dynamic aging (DSA) phenomenon which occurs somematerial rate cause a ofthe form bands called Portevin Le Chatelier(PLC). For tensile test imposed rate, they are associated on thetensile curve with repeated serrations resulting from succession stressdrops. case stress PLC arecharacterized by discontinuities levels strain. Thislocalization appear different crystallattice (mild steels, austenitic stainless aluminium alloys, zirconiumalloys…).