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研究了一种 Al-Li 合金的低温力学性能,并探讨了其低温变形机制.合金低温变形时由于位错组态的改变导致了变形微裂纹的产生,从而引起紧凑拉伸试样中微裂纹的大量分岔和转向扩展,此时试样能承受很高的载荷。微裂纹的形成还对光滑试样强度和形变硬化指数的提高以及缺口敏感性能的改善都有一定的作用。
The mechanical properties of Al-Li alloy at low temperature were studied and the mechanism of low temperature deformation was also discussed.The deformation of dislocation caused by the change of dislocation configuration resulted in the formation of micro-cracks during low temperature deformation, A large number of bifurcation and steering expansion, this time the sample can withstand high loads. The formation of microcracks also has a certain effect on the improvement of the strength and deformation hardening index of smooth specimens and the improvement of notch sensitivity.