微结构演变对通过搅拌摩擦焊制造的铝合金异种焊缝的机械和电化学性质的影响

Marta Lipińska, Agnieszka Kooijman, Lucjan Śnieżek, Ireneusz Szachogłuchowicz, Janusz Torzewski, Yaiza Gonzalez-Garcia, Małgorzata Lewandowska
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摘要

本研究调查了两种铝合金搅拌摩擦焊接接头的新结构。研究了 AA6082/AA1350 异种焊缝,并对 AA1350 的两种状态--粗晶粒 (CG) 和超细晶粒 (UFG) 进行了调查。讨论了焊缝微观结构演变过程中机械和电化学性能的变化。所有材料在搅拌区(SZ)的平均晶粒大小均为 4 至 5 µm,高角度晶界的比例约为 77%,表明发生了连续的动态再结晶。焊缝显微硬度的变化与晶粒大小的差异(AA1350)和 AA6082 搅拌区中 β″ 沉淀的溶解有关。因此,与 AA6082 和 AA1350 UFG 母材相比,焊缝的抗拉强度有所降低;但与 AA1350 CG 母材相比,焊缝的抗拉强度有所提高。电化学实验表明,AA1350 发生了点状腐蚀,而 AA6082 则同时发生了点状腐蚀和晶间腐蚀。AA1350 的腐蚀深度较高,基体材料的最大值约为 70 µm,而在 SZ 中,腐蚀深度降至 50 µm。AA6082 的最大腐蚀深度是在 SZ 中测得的,不超过 30 微米。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Influence of Microstructure Evolution on the Mechanical and Electrochemical Properties of Dissimilar Welds from Aluminum Alloys Manufactured Via Friction Stir Welding

The Influence of Microstructure Evolution on the Mechanical and Electrochemical Properties of Dissimilar Welds from Aluminum Alloys Manufactured Via Friction Stir Welding

The present study investigated a new configuration of friction stir welded joints from two aluminum alloys. Dissimilar welds AA6082/AA1350 were examined, whereas, for AA1350, two states were investigated—coarse-grained (CG) and ultrafine-grained (UFG). Changes in the mechanical and electrochemical properties regarding the microstructure evolution across the welds were discussed. The average grain size in the stir zone (SZ) for all materials equaled 4 to 5 µm with a fraction of high-angle grain boundaries of about 77 pct, indicating the occurrence of continuous dynamic recrystallization. Changes in the microhardness across the welds were connected with differences in grain size (AA1350) and dissolution of β″ precipitates in the SZ of AA6082. As a result, the tensile strength of the welds decreased compared to base materials AA6082 and AA1350 UFG; however, there was an increase when compared to the base material AA1350 CG. Electrochemical experiments revealed that pitting corrosion occurred for AA1350, while for AA6082, it was a combination of pitting and intergranular corrosion. The depth of corrosion attack was higher for AA1350, with a maximum value of ~ 70 µm for base materials, while in the SZ, a depth decreased to 50 µm. For the AA6082, the maximum depth was measured in the SZ and did not exceed 30 µm.

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