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以6061铝合金棒球棒为研究对象,研究了铸造成形工艺过程中合金力学性能与微观组织。结果表明:合金在温度较低时其组织主要为动态回复组织,晶粒沿变形方向明显被拉长,表现为宏观上纤维状,随温度升高,在拉长的晶粒旁边不断出现极少量的细小再结晶晶粒,在高温时部分晶粒在晶界部位出现锯齿化现象;典型的单峰型动态再结晶曲线为合金的应力应变曲线的特征,且合金的稳态和峰值应力都随应变速率增加和实验温度降低而增加,对应的最小值分别为26、23MPa,最大值分别达到104、86MPa;动态再结晶晶粒尺寸和动态再结晶体积分数随温度的升高和应变速率的降低而增加。
Taking 6061 aluminum alloy baseball bat as the research object, the mechanical properties and microstructure of the alloy during the casting forming process were studied. The results show that the microstructure of the alloy is mainly the dynamic recovery structure when the temperature is low, and the grains are obviously elongated along the deformation direction. The grains appear macroscopically fibrous. As the temperature increases, a very small amount Of the fine recrystallized grains, some of the grains appear to be sawtooth in the grain boundary part at high temperature. The typical unimodal dynamic recrystallization curve is characteristic of the stress-strain curve of the alloy, and the steady-state and the peak stress of the alloy both follow Strain rate increases and the experimental temperature decreases. The corresponding minimum values are respectively 26,23MPa and maximum values of 104,86MPa respectively. The dynamic recrystallization grain size and dynamic recrystallization volume fraction increase with the increase of temperature and strain rate Increase.