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用Hopkinson杆实验装置在不同温度下对LY12铝合金进行动态压缩实验.采用XRD线形分析对压缩试样的微细观结构演化进行研究.由XRD的积分宽度确定试样中位错为刃型位错.衍射峰形的Fourier分析表明,在动态加载下,材料内部的位错密度在塑性流动的初期迅速趋于饱和,且随着测试温发的升高,位错密度呈递减趋势,同时亚结构的尺寸不断增加.衍射峰形分析结果显示在280—300℃之间亚结构尺寸迅速增长,与LY12铝合金在280℃附近发生第:相粒子的溶解对应.
The dynamic compression experiments of LY12 aluminum alloy were carried out at different temperatures by using Hopkinson rod test apparatus. The microstructure evolution of the compressed samples was investigated by XRD linear analysis. The dislocations of the specimens were determined as edge dislocations by the integral width of XRD The Fourier analysis of the diffraction peaks shows that the dislocation density inside the material rapidly saturates at the initial stage of plastic flow under dynamic loading, and the dislocation density decreases with the increase of the test temperature. At the same time, the substructure Diffraction peak shape analysis showed that the size of the sub-structure rapidly increased between 280-300 ℃, corresponding to the dissolution of the phase particles in the vicinity of 280 ℃ of LY12 aluminum alloy.