Abstract The addition of lithium to high strength aluminum alloys significantly improves specific strength as is the case with AA 2195. However, unlike non-lithium containing alloys, such as AA 7075, lithium containing alloys display anisotropic mechanical properties in low aspect ratio extruded sections. The goal of this study is to elucidate the origins of anisotropy in AA 2195 and to investigate processing methods to control mechanical properties. To this end, both AA 2195 and AA 7075 were systematically extruded over a range of aspect ratios from 2 to 15 while maintaining a constant extrusion ratio. Through crystallographic texture component analysis and the use of a newly proposed parameter termed the “Plate-Like Number”, this study indicates that the Copper texture is primarily responsible for previously observed anisotropic properties of AA 2195. A series of rolling studies analyzed using the Plate-Like Number suggest that a higher initial billet temperature will minimize the Copper texture component and thus reduce the anisotropy in extruded AA 2195.

中文翻译：

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挤压 AA 2195 和 AA 7075 中的晶体结构发展

摘要 向高强度铝合金中添加锂可显着提高比强度，就像 AA 2195 一样。然而，与不含锂的合金（如 AA 7075）不同，含锂合金在低纵横比挤压截面中显示出各向异性的机械性能。本研究的目的是阐明 AA 2195 各向异性的起源，并研究控制机械性能的加工方法。为此，AA 2195 和 AA 7075 都在 2 到 15 的纵横比范围内系统地挤出，同时保持恒定的挤出比。通过晶体结构成分分析和使用新提出的称为“板状数”的参数，