通过拉伸试验机、透射电镜、扫描电镜等研究了添加微量铈对T8和T6时效态2195铝锂合金显微组织和拉伸性能的影响。结果表明：添加微量铈能使热处理态2195铝锂合金的组织及性能得到明显改善;微量铈一方面能使合金的主要强化相T1相和θ′相增多,且更均匀细小地弥散分布;另一方面能有效细化晶粒、净化晶界和抑制再结晶,使合金的组织分层更加薄化,在一定程度上改善合金的断裂行为,减少沿晶断裂倾向。
The effect of and trace Ce on the microstructure and tensile properties of T8 aged and T6 aged 2195 aluminum-lithium alloy had been studied by tensile tester,transmission electron microscopy and scanning electron microscopy,etc.The results show that the addition of Ce could significantly improve the microstructure and mechanical properties of heat-treated 2195 aluminum alloy.The trace Ce could increase the amount of the major strengthening phase of T1 and θ′ phase and make them distribute more dispersively and homogenously.On the other hand,Ce could refine the grain size,purify the grain boundaries,restrain the recrystallization and make the microstructure delamination of the alloy thinner,which could improve the fracture behavior of alloy and decrease the tendency of intergranular fracture in a certain degree.
参考文献
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