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测定了 8 090 Al-Li合金的沉淀硬化动力学曲线,以及在峰值时效(T6),欠、过时效和预延展应变时效(T8)状态下的机械性能。用透射、扫描电镜考察了对应组织特征。指出,时效温度是控制δ′和s′相复合沉淀动力学的关键参数;在δ′和s′相优化组合的 T6状态,σ_(0.2)达 420 MPa;T8状态的 σ_(0.2)为 440 MPa,略改善塑性发现一种热加工后残存的块状富Cu脆性组织对塑性有重要影响。
The precipitation hardening kinetics curves of 8 090 Al-Li alloy were measured and the mechanical properties under peak aging (T6), under-aging, over-aging and pre-stretching strain aging (T8) were measured. The corresponding tissue characteristics were examined by transmission electron microscopy and scanning electron microscopy. It is pointed out that the aging temperature is the key parameter to control the composite precipitation kinetics of δ ’and s’ phase. Σ_ (0.2) reaches 420 MPa in the optimized combination of δ’ MPa, a slight improvement in ductility Found a thermal processing residual Cu-rich massive brittle tissue has a significant impact on plasticity.