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Microtexture and nanoindentation study of delamination cracking in Al-Cu-Li-X alloys

机译：铝 - Li-X合金中分层裂纹的微调和纳米凸缘研究

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Commercial Al-Li alloys have strength and weight advantages over non-Al-Li alloys. The fracture behavior of these alloys is unusual and has limited their use. The fracture mode, described as delamination, is intergranular, along the broad grain boundaries parallel to the rolling plane of the plate. Microtexture analyses have shown that delaminations occur along boundaries with greater than 30° misorientation. However, it was observed that relatively few of the high angle boundaries exhibited this behavior. Some grains of the retained deformation texture show high internal misorientation, which is a measure of stored strain energy. Delamination tends to occur between these grains and adjacent, recrystallized grains. Nanoindentation studies indicate a higher hardness for the high internal misorientation grains. These results suggest that the delamination could be reduced by processing the alloys to minimize grain-to-grain property disparities.
机译：商业Al-Li合金具有优于非Al-Li合金的强度和体重优势。这些合金的断裂行为是不寻常的，并限制了它们的使用。将被描述为分层的断裂模式是跨晶状体的，沿着与板的滚动平面平行的宽晶界。 MicroTexture分析表明，Deraminations沿着具有大于30°的界限发生。然而，观察到，相对较少的高角度边界表现出这种行为。保留变形纹理的一些颗粒显示出高内部杂乱素，这是一种储存应变能量的量度。倾向于在这些晶粒和相邻的重结晶晶粒之间发生分层。纳米indentation研究表明高内部杂乱素谷物的更高硬度。这些结果表明，通过加工合金可以减少谷物对谷物性能差异，可以减少分层。

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