Abstract

The separate and joint effect of IR laser irradiation and electric current on the Portevin–Le Chatelier effect and generation of deformation bands in aluminum–magnesium alloy AlMg6 has been investigated in situ by complex methods, including acoustic emission (AE) and high-speed video recording. The nucleation and evolution of the deformation bands initiated by pulsed laser radiation focused on the surface of deformed sample have been investigated with the time resolution up to 0.1 ms. The conditions under which a single laser “puncture” with a duration of up to ~1 ms initiates discontinuous deformation during several tens of seconds and reduces significantly (by a factor of 1.5) the critical strain of the onset of Portevin–Le Chatelier effect in AlMg6 alloy are revealed. It is established that transmission of low-density (below 40 А/mm²) direct electric current suppresses the negative influence of laser irradiation and completely stabilizes the deformation behavior of the alloy. Possible applications of the obtained results are discussed.

中文翻译：

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红外激光辐照和电流作用下铝合金中Portevin-Le Chatelier效应的引发和抑制

摘要

通过包括声发射（AE）和高速视频在内的复杂方法，就地研究了红外激光辐照和电流对Portevin-Le Chatelier效应和铝镁合金AlMg6的变形带产生的单独联合作用。记录。已经研究了脉冲激光辐射聚焦在变形样品表面上引起的形变带的形核和演化，其时间分辨率高达0.1 ms。在单个激光“穿刺”持续约1毫秒的条件下，会在几十秒内引发不连续变形，并显着降低（因数1.5）Portevin–Le Chatelier效应发作的临界应变。揭示了AlMg6合金。已确定低密度传输（低于40А/ mm²）直流电可抑制激光辐照的负面影响，并完全稳定合金的变形行为。讨论了所得结果的可能应用。