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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.1; Jul 7-11, 2003; Leganes, Madrid, Spain >In-Situ, Laser-Ultrasonic Monitoring of the Recrystallization of Aluminum Alloys
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In-Situ, Laser-Ultrasonic Monitoring of the Recrystallization of Aluminum Alloys

机译：铝合金再结晶的原位激光超声监测

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摘要

Laser-ultrasonics is a non-destructive and non-contact technique to generate and detect ultrasound in materials. The measured ultrasonic velocity depends on the orientation distribution of the crystallites and may be used to infer the lowest order texture coefficients. Recrystallization generally involves texture changes and can thus be monitored using ultrasonics. In this paper, cold-rolled samples of an Al-Mg alloy (AA5754) and an Al-Si-Mg-Cu alloy (AA6111) are annealed in a Gleeble thermomechanical simulator at various temperatures. The recrystallization kinetics is monitored in-situ and in real time by laser-ultrasonics. It is found that longitudinal and shear velocity variations correlate well with the recrystallized fraction, as evaluated by metallography and by the softening behavior of samples submitted to similar thermal cycles. It is also found that the ultrasonic behavior is consistent with the randomization of texture and a reduction of the W_(400) and W_(420) texture coefficients.
机译：激光超声技术是一种非破坏性和非接触式技术，用于生成和检测材料中的超声。测得的超声速度取决于微晶的取向分布，并可用于推断最低阶的织构系数。重结晶通常涉及纹理变化，因此可以使用超声波进行监测。在本文中，将Al-Mg合金（AA5754）和Al-Si-Mg-Cu合金（AA6111）的冷轧样品在Gleeble热机械模拟器中于不同温度下进行退火。再结晶动力学通过激光-超声技术进行实时监测。发现，通过金相学和通过经历相似热循环的样品的软化行为进行评估，纵向和剪切速度的变化与重结晶部分具有很好的相关性。还发现超声行为与纹理的随机化以及W_（400）和W_（420）纹理系数的减小是一致的。

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