Some aspects of Portevin–Le Chatelier plastic instabilities investigated by infrared pyrometry
Some aspects of Portevin–Le Chatelier plastic instabilities investigated by infrared pyrometry
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DOI：
10.1016/j.msea.2004.11.042
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发表时间：
2005-03
期刊：
影响因子：
6.4
通讯作者：
N. Ranc;D. Wagner
中科院分区：
文献类型：
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作者：
N. Ranc;D. Wagner
研究了铝铜合金在室温拉伸过程中与Portevin-Le Chatelier效应有关的变形不均匀性。塑性变形伴随着机械能耗散成热。为了观察变形带的局部化，我们使用了一个高温计耦合到一个红外摄像机。该装置用于可视化变形带的形成并量化表观速度。从这些热数据中，我们还可以确定带的几何特征：方向，带宽和两个带之间的空间。在1500μs的孔径时间和60 Hz的采集频率下，可以估计出带形成时间和中间带时间。在带的出现期间的温度变化的测量被用于量化带中的塑性变形。
The deformation heterogeneity related to the Portevin–Le Chatelier effect has been studied for aluminium–copper alloy during a tensile test at ambient temperature. Plastic deformation is accompanied by dissipation of mechanical energy into heat. To observe the localization of deformation in bands, we used a pyrometer coupled to an infrared camera. This device serves to visualize the formation of the deformation bands and to quantify apparent velocity. From these thermal data, we can also determine the geometrical characteristics of the bands: orientation, bandwidth, and space between two bands. The aperture time (1500μs) and the acquisition frequency of the camera (60Hz) allow the band-formation time and the middle-band time to be estimated. The measurement of the variation in temperature during the appearance of a band is used to quantify the plastic deformation in the band.