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<p>This study experimentally investigates the Portevin–Le Chatelier (PLC) phenomenon in a strain-hardened 5083 Al-Mg alloy deformed in tension at a nominal strain rate of 10<sup>−3</sup> s<sup>−1</sup> and at room temperature, using digital image correlation (DIC) as the main measurement technique, complemented by optical profilometry. The combined analysis of serration morphology, statistical features, and DIC fields shows that, under these conditions, the unstable regime is initially governed by Type B PLC activity associated with a propagating PLC front that is clearly distinct from the deformation bands nucleating in its wake. The results further indicate that Type B PLC affects the entire gauge length before Type C PLC takes over, with a short hybrid transition regime where features of both types coexist. A highly localized instantaneous mechanical response is observed in the front region, together with a measurable thickness variation between PLC-affected and unaffected areas, confirmed by profilometry. On this basis, a simple conceptual framework is proposed to explain the main features of the propagating PLC front under Type B activity.</p>

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Unstable Plastic Behavior in Al-Mg Alloy: Insights into PLC Type B Activity

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Walid Najjar,
  • Idriss Tiba,
  • Quentin Hatte,
  • Philippe Dal Santo

摘要

This study experimentally investigates the Portevin–Le Chatelier (PLC) phenomenon in a strain-hardened 5083 Al-Mg alloy deformed in tension at a nominal strain rate of 10−3 s−1 and at room temperature, using digital image correlation (DIC) as the main measurement technique, complemented by optical profilometry. The combined analysis of serration morphology, statistical features, and DIC fields shows that, under these conditions, the unstable regime is initially governed by Type B PLC activity associated with a propagating PLC front that is clearly distinct from the deformation bands nucleating in its wake. The results further indicate that Type B PLC affects the entire gauge length before Type C PLC takes over, with a short hybrid transition regime where features of both types coexist. A highly localized instantaneous mechanical response is observed in the front region, together with a measurable thickness variation between PLC-affected and unaffected areas, confirmed by profilometry. On this basis, a simple conceptual framework is proposed to explain the main features of the propagating PLC front under Type B activity.