Abstract
The temperature-strain rate domain of the Portevin-Le Chatelier (PLC) effect has been determined for three ultrafine grained aluminum alloys: Al-3Mg (A1), Al-4,57Mg-0,35Mn-0,2Sc-0,09Zr (A2) and Al-5,4Mg-0,52Mn-0,1Zr (A3) (wt.%). The apparent activation energy of the serrated yielding was estimated. It was found that the presence of dispersed particles leads to a decrease in the activation energy and the temperature–strain rate domain of the PLC effect becomes narrower.
Highlights
Non-heat treatable Al-Mg alloys are widely used in various industries, in particular, in aircraft, automotive and shipbuilding industries, and operated at cryogenic temperature
The temperature-strain rate domain of the Portevin-Le Chatelier (PLC) effect has been determined for three ultrafine grained aluminum alloys: Al-3Mg (А1), Al-4,57Mg0,35Mn-0,2Sc-0,09Zr (А2) and Al-5,4Mg-0,52Mn-0,1Zr (А3)
It was found that the presence of dispersed particles leads to a decrease in the activation energy and the temperature–strain rate domain of the PLC effect becomes narrower
Summary
Non-heat treatable Al-Mg alloys are widely used in various industries, in particular, in aircraft, automotive and shipbuilding industries, and operated at cryogenic temperature. Al-Mg alloys have been used as the common materials for studying the PortevinLe Chatelier (PLC) effect [3,4]. These alloys are characterized by the instability of plastic deformation in a wide temperature/strain rate interval [4,5,6]. The PLC effect in Al-Mg alloys can be observed at the room temperature in a certain strain-strain rate interval [7,8] and it is characterized by strain localization in the form of narrow bands of intense shear. The purpose of the present study is to establish the influence of the phase composition on the region of existence of the PLC effect in Al-Mg alloys
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