等通道转角挤压(ECAP)方法制备的Al--Li--Cu--Mg--Zr合金主要由晶粒小于1 m的等轴晶组成。循环形变时， ECAP Al--Li--Cu--Mg--Zr合金在应变幅较小时先出现短暂软化, 然后持续硬化；在应变幅较大时持续软化直至断裂。ECAP Al--Li--Cu--Mg--Zr合金的Coffin--Manson曲线近似一条直线。这些特性均与文献报道的峰时效Al--Li--Cu--Mg--Zr合金有所不同。
Equal--channel angular pressed (ECAP) Al--Li--Cu--Mg--Zr alloy mainly consists of near equi--axial grains with size smaller than 1 m. ECAP Al--Li--Cu--Mg--Zr alloy cyclically softens continuously to failure at higher strain amplitude of p/2=5.510 -3, but cyclically softens initially and then harden continuously to failure at lower strain amplitudes of p/2=510 -4---2.610 -3. The Coffin--Manson curve of the ECAP Al--Li--Cu--Mg--Zr alloy shows an ideal straight line. All these properties are different from those reported previously for the conventional peak--aged Al--Li--Cu--Mg--Zr alloy.
参考文献
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