等通道转角挤压Al-Li-Cu-Mg-Zr合金的循环形变行为

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1μm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。

Cyclic Deformation Behavior Of ECAP Al--Li--Cu--Mg--Zr Alloy

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 softenscontinuously to failure at higher strain amplitude of p/2=5.510 -3, but cyclically softens initially and then harden continuously to failure at lower strain amplitudes of p/2=510 -4---2.610 -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.