【摘 要】
：
0The effect of peak temperature (Tp) at 200,300,400,500 and 550 ℃ on the microstructural evolution and softening behavior of the simulated heat-affected zone (HAZ) was studied in the 2219-T87 alloy by electron-backscatter diffraction,transmission electron
【机 构】
：
School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;School of Mat
论文部分内容阅读
0The effect of peak temperature (Tp) at 200,300,400,500 and 550 ℃ on the microstructural evolution and softening behavior of the simulated heat-affected zone (HAZ) was studied in the 2219-T87 alloy by electron-backscatter diffraction,transmission electron microscopy,X-ray diffraction,micro-hardness and micro-tensile tests.The results showed that the grain size in the HAZs at 200-500 ℃ was comparable,but the number density of the strengthening precipitates (GP zones/θ\') decreased with increasing Tp.At a Tp of 550 ℃,the grain size significantly decreased and the distribution of the misorientation angles corresponded to the MacKenzie distribution.The GP zones/θ\'phase coarsened and translated into θ phases at Tp values in the range of 200-400 ℃.Increasing the Tp to 500 ℃ and above,some θ\'phases translated into θ phases and others dissolved into the α-Al matrix which led to an increase in the solid solution strengthening.The reduction of the number density of the GP zones/θ\'was responsible for the softening behavior.
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