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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting; 20040314-20040318; Charlotte,NC; US >The Role of Slip Length and Precipitation on the Ductility and Fracture Behavior of Isotropic Al-Li-Cu-X Alloys AF/C-458 and AF/C-489
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The Role of Slip Length and Precipitation on the Ductility and Fracture Behavior of Isotropic Al-Li-Cu-X Alloys AF/C-458 and AF/C-489

机译：滑移长度和沉淀对各向同性Al-Li-Cu-X合金AF / C-458和AF / C-489的延性和断裂行为的影响

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摘要

This study examines the role of composition, grain structure, and precipitate microstructures on the slip, deformation, and fracture behaviors of two isotropic Al-Li-Cu-X alloys designated AF/C-458 (1.8wt% Li) and AF/C-489 (2.1wt% Li). Quantitative precipitate density measurements of T_1 (Al_2CuLi), θ"/θ' (Al_2Cu), and δ' (Al_3Li) were used in planar slip intensity calculations, which predicted the amount of strain localization impinging at sub-grain and high-angle grain boundaries. This investigation demonstrated that the shearing of the δ', θ"/θ', and T_1 precipitates led to the fine and coarse planar slip found in the AF/C-458 and AF/C-489 alloys, respectively. These results suggest that the low ductility and coarse intergranular fracture behavior of AF/C-489 in comparison to the higher ductility and transgranular fracture behavior of AF/C-458 is most strongly attributed to the ～3 times greater slip length and to a much lesser extent on the higher Li content for AF/C-489. Duplex aging practices were then employed in an attempt to increase the ductility of AF/C-489 by either refining the matrix T_1 precipitate microstructure or reverting the shearable δ' precipitates back into solution. These duplex practices proved successful as the ductility of AF/C-489 was increased by 65-75% with a reduction of only 4-11% from the baseline 150℃ 24H yield strength.
机译：本研究探讨了成分，晶粒结构和析出物微观结构对两种分别称为AF / C-458（1.8wt％Li）和AF / C的各向同性Al-Li-Cu-X合金的滑动，变形和断裂行为的作用-489（2.1wt％Li）。在平面滑动强度计算中使用了T_1（Al_2CuLi），θ“ /θ'（Al_2Cu）和δ'（Al_3Li）的定量沉淀密度测量值，从而预测了在局部晶粒和高角度晶粒上发生的应变局部化的量。这项研究表明，δ'，θ'/θ'和T_1析出物的剪切导致分别在AF / C-458和AF / C-489合金中产生了精细和粗糙的平面滑移。这些结果表明，与AF / C-458较高的延展性和经颗粒断裂行为相比，AF / C-489较低的延展性和较粗的晶间断裂行为最主要归因于滑移长度的约3倍，并且是对于AF / C-489，较高的Li含量影响较小。然后采用双工时效实践，通过细化基质T_1沉淀物的微观结构或将可剪切的δ'沉淀物还原回溶液中来尝试提高AF / C-489的延展性。这些双工实践证明是成功的，因为AF / C-489的延展性提高了65-75％，而从150℃24H屈服强度的基线仅降低了4-11％。

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