Characterization of friction stir welded Al-4Cu-Mg alloy / Al-16Si-4Cu-10SiC composite joint

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Advanced Joining Processes Pub Date : 2024-01-20 DOI:10.1016/j.jajp.2024.100192
Hamed Jamshidi Aval , Ivan Galvão
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Abstract

This study investigated the tool's rotational speed effect during dissimilar friction stir welding of A390–10 wt.% SiC composite-AA2024 aluminum alloy on microstructure, mechanical properties, and corrosion resistance. The results show that the tunnel defect is created on the advancing side at low rotational speeds of 400 and 600 rpm due to insufficient material flow and a high rotational speed of 1200 rpm due to turbulent material flow in the stir zone. Finely equiaxed recrystallized grains are formed in the stir zone under a high plastic strain rate and particle-stimulated nucleation mechanism. The minimum hardness occurs in the TMAZ of the AA2024 aluminum alloy side, and by increasing the rotational speed from 800 to 1000 rpm, the average hardness in the stir zone decreases from 146.06±8.67 to 137.86±3.98 HV0.1. Also, by increasing the rotational speed from 800 to 1000 rpm, the stir zone's yield strength and ultimate tensile strength decrease by 4.9 and 5.2%, respectively. With the increased rotational speed from 800 to 1000 rpm, corrosion current increases from 0.0213 to 0.0225 mA.cm−2, and corrosion resistance decreases by 17 %. After friction stir welding with a rotational speed of 800 rpm and traverse speed of 20 mm/min, the corrosion resistance of the joint increases and decreases compared to the composite base metal and AA2024 aluminum alloy base metal, respectively.

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搅拌摩擦焊接 Al-4Cu-Mg 合金/Al-16Si-4Cu-10SiC 复合接头的特性分析
本研究调查了 A390-10 wt.% SiC 复合材料-AA2024 铝合金异种摩擦搅拌焊接过程中工具转速对微观结构、机械性能和耐腐蚀性能的影响。结果表明,在 400 和 600 转/分的低转速下,由于材料流动不充分,在前进侧产生了隧道缺陷;而在 1200 转/分的高转速下,由于搅拌区内材料流动紊乱,产生了隧道缺陷。在高塑性应变率和颗粒刺激成核机制下,细小的等轴再结晶晶粒在搅拌区形成。AA2024 铝合金侧的 TMAZ 硬度最低,将转速从 800 rpm 提高到 1000 rpm 后,搅拌区的平均硬度从 146.06±8.67 降至 137.86±3.98 HV0.1。此外,将转速从 800 转/分提高到 1000 转/分后,搅拌区的屈服强度和极限抗拉强度分别降低了 4.9% 和 5.2%。随着转速从 800 rpm 提高到 1000 rpm,腐蚀电流从 0.0213 mA.cm-2 增加到 0.0225 mA.cm-2,耐腐蚀性降低了 17%。以 800 rpm 的转速和 20 mm/min 的横移速度进行搅拌摩擦焊接后,与复合母材和 AA2024 铝合金母材相比,接头的耐腐蚀性分别增加和减少。
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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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