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首页> 外文期刊>Materials Characterization >Friction stir welding of 2060-T8 Al-Li alloy. Part I: Microstructure evolution mechanism and mechanical properties
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Friction stir welding of 2060-T8 Al-Li alloy. Part I: Microstructure evolution mechanism and mechanical properties

机译：2060-T8 Al-Li合金的摩擦搅拌焊接。 第一部分：微观结构演化机制和机械性能

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摘要

2 mm thick rolled 2060-T8 Al-Li alloy plates were subjected to friction stir welding (FSW) under rotation rates of 400-1200 rpm and welding speeds of 50-200 mm/min. In the nugget zone (NZ), FSW resulted in the dissolution of the precipitates and the formation of delta ' (Al3Zr) precipitates, as well as the formation of Guinier-Preston (GP) and Guinier-Preston-Bagaryatsky (GPB) zones except for at 400 rpm-200 mm/min. In the heat affected zone (HAZ), FSW led to the dissolution and coarsening of T1 (Al2CuLi) and S ' (Al2CuMg), and the subsequent formation of new theta ' (Al2Cu) and sigma (Al5Cu6Mg2) precipitates. The lowest hardness zones (LHZs) of the FSW joints were located at either the NZ or the HAZ under varied welding parameters. Different from the FSW joints of conventional precipitation-hardened aluminum alloys, the ultimate tensile strength of FSW 2060-T8 joints increased as the rotation rate increased from 400 to 800 rpm, but was unchanged with further increasing the rotation rate from 800 to 1200 rpm under a constant welding speed of 200 mm/min. On the other hand, the joint strength increased as the welding speed increased from 50 to 200 mm/min under a constant rotation rate of 1200 rpm. While the FSW joints fractured at the LHZs under 400 rpm-200 mm/min and 1200 rpm-50 mm/min, abnormal fracture at the thermo-mechanically affected zone (TMAZ) was observed under 800 rpm-200 mm/min and 1200 rpm-200 mm/min.
机译：在400-1200rpm的旋转速率下进行2 mm厚的轧制2060-T8 Al-Li合金板（FSW），摩擦速度为400-1200rpm，焊接速度为50-200mm / min。在核心区（NZ）中，FSW导致沉淀物的溶解和δ（Al3Zr）沉淀物的形成，以及Guinier-Preston（GP）和Guinier-Preston-Bagryatsky（GPB）区的形成除外适用于400 rpm-200 mm / min。在热影响区（HAZ）中，FSW导致T1（Al 2Culi）和S'（Al2cumG）的溶解和粗化，以及随后形成新的Theta'（Al2Cu）和Sigma（Al5Cu6mg2）沉淀物。 FSW关节的最低硬度区域（LHZ）位于各种焊接参数下的NZ或HAZ中。与常规沉淀硬化铝合金的FSW关节不同，FSW 2060-T8接头的最终拉伸强度随着旋转速率从400增加到800 rpm而增加，但不变，进一步增加了800至1200 rpm的旋转速率恒定焊接速度为200毫米/分钟。另一方面，随着焊接速度从1200rpm的恒定旋转速率的恒定旋转速率增加到200至200mm / min，接合强度增加。虽然在400 rpm-200mm / min和1200 rpm-50mm / min的LHz下裂缝的FSW关节在800 rpm-200mm / min和1200rpm下观察到热机械受影响的区域（TMAZ）处的异常断裂-200 mm / min。

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