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Experimental investigation of the dynamic impact responses of as-cast and homogenized A535 aluminum alloy

机译：铸态均质A535铝合金动态冲击响应的实验研究

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Aluminum A535 alloy plates were received in the as-cast condition. Some specimens cut from the cast plates were homogenized at 400 degrees C for 5h and then quenched in water to room temperature. SEM, EDS, and EBSD analyses of ground and polished specimens show that in addition to a change in crystallographic texture of the A535 alloy, significant reduction in pores and removal of microsegregation occurred during homogenization heat-treatment of the as-cast specimens. Homogenizing heat treatment also decreased the average grain size of the alloy by discontinuous static recrystallization mechanism. The dynamic impact responses of as-cast and homogenized aluminum A535 alloy were experimentally determined using the split Hopkinson pressure bar system. At a true strain rate between 4 x 10(3) and 14.2 x 10(3 )s(-1), the homogenized specimens exhibited better dynamic mechanical strength and ductility than the as-cast specimens. Higher strength in the homogenized specimen is attributed to higher grain boundary area and stronger evolution of CD parallel to[110] grains than in the as-cast specimens. On the other hand, severe mechanical damage such as loss of roundness of cylindrical specimen, severe micro-cracks and formation of adiabatic shear bands occurred more in homogenized specimens than in as-cast specimens. Using the electron back-scattered diffraction technique, activation of multiple dynamic recrystallization (DRX) mechanisms and the role of crystallographic texture were observed in the investigated alloy. While continuous DRX occurred at the center of the deformed specimens, discontinuous DRX occurred homogenously on the entire polished surface of the specimen at particle sites. Microsegregation and texture-related conditions enhanced DRX more readily in as-cast specimens than in the homogenized specimens. The mode of dynamic failure and fracture in the investigated alloy deviates from those reported in the literature for wrought alloys.
机译：铝A535合金板在铸态下接收。从铸板上切下的一些样品在400摄氏度下均化5h，然后在水中淬火至室温。 SEM，EDS和EBSD对研磨和抛光试样的分析表明，除了改变A535合金的晶体织构外，在铸态试样的均质化热处理过程中，孔隙的显着减少和微偏析的消除也发生了。均质热处理还通过不连续的静态再结晶机制降低了合金的平均晶粒尺寸。使用分开的霍普金森压力棒系统通过实验确定铸态和均质铝A535合金的动态冲击响应。在4 x 10（3）和14.2 x 10（3）s（-1）之间的真实应变率下，均质试样比铸态试样具有更好的动态机械强度和延展性。与铸态试样相比，均质试样中较高的强度归因于较高的晶界面积和平行于[110]晶粒的CD的更强演化。另一方面，均质的试样比铸态的试样更严重地发生机械损伤，例如圆柱形试样的圆度损失，严重的微裂纹和绝热剪切带的形成。使用电子背散射衍射技术，在研究的合金中观察到了多种动态再结晶（DRX）机理的激活以及晶体织构的作用。当连续DRX发生在变形试样的中心时，不连续DRX均匀地发生在试样整个抛光表面的颗粒位置。与均质样品相比，铸态样品中的微观偏析和与纹理相关的条件更容易增强DRX。所研究合金的动态失效和断裂模式与锻造合金文献中报道的那些不同。

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