新型低合金化高强Mg-0.2Ce-0.2Ca合金挤压过程中的组织演变机理

李景仁, 谢东升, 张栋栋, 谢红波, 潘虎成, 任玉平, 秦高梧

Microstructure Evolution Mechanism of New Low-Alloyed High-Strength Mg-0.2Ce-0.2Ca Alloy During Extrusion

LI Jingren, XIE Dongsheng, ZHANG Dongdong, XIE Hongbo, PAN Hucheng, REN Yuping, QIN Gaowu

图4 距离挤压出口17.5 mm位置处的典型EBSD和TEM像

Fig.4 Typical EBSD and TEM images at the position of 17.5 mm below extrusion die exit of Mg-0.2Ce-0.2Ca billet (a) the IPF map (b) grain boundary (GB) and twin boundary (TB) (θ—crystallographic misorientation angle between the two sides of the boundary) (c) enlarged zone of Fig.4b (The schematic insert in Fig.4c illustrates characteristic position of the billet below extrusion die exit in Figs.4-7) (d-f) existence of <a> dislocations (d) and <c + a> dislocations (e, f) (Insets in Figs.4e and f show the two-beam conditions of g = 0002 and g = 112¯0, respectively)