Structure-property correlation for friction stir welded joints of 2219Al alloys microalloyed with Cd

IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
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Abstract

Present study aimed at experimental investigation of microstructural evolution, microhardness profile, tensile and impact properties of friction stir welded (FSW) joints of 2219Al alloys microalloyed with varying (up to 0.1 wt%) Cd contents. FSW was performed on the cast and homogenized alloys. Microstructural analysis from weld line up to base metal, identified three sequential heat affected weld zones having separate grain morphologies, namely Weld Nugget Zone (WNZ), Thermo-Mechanical Affected Zone (TMAZ) and Heat Affected Zone (HAZ). Vickers microhardness value increased from weld line towards the WNZ, then decreased towards the TMAZ, and finally increased through HAZ towards the base metal, which exhibited higher hardness compared to all the heat affected weld zones. Microhardness, yield and tensile strengths of the FSW joint of 2219Al alloy increased, due to microalloying with 0.06 wt% of Cd contents, which was attributed to continuous grain refinement. While tensile ductility and toughness, and impact toughness of the welded joint reduced, resulting from trace additions of Cd. Investigated alloys retained significant mechanical strength, ductility and toughness, on the respective joints, following to the FSW operation. Cd was observed to be a potential microalloying element to control the microstructure, refine grain size and improve mechanical strength and hardness of the welded joint of 2219Al alloy. Present experimental results established a structure-property correlation, in order to validate potential application of FSW technique on investigated 2219Al alloys with trace additions of Cd, to attain desirable weld-quality avoiding welding imperfections.

Abstract Image

镉微合金化 2219Al 合金搅拌摩擦焊接接头的结构-性能相关性
本研究旨在对镉含量不同(最高达 0.1 wt%)的 2219Al 合金微合金摩擦搅拌焊接(FSW)接头的微结构演变、显微硬度曲线、拉伸和冲击性能进行实验研究。对铸造和均化合金进行了 FSW。从焊缝到基体金属的微观结构分析确定了三个具有不同晶粒形态的连续热影响焊接区,即焊块区(WNZ)、热机械影响区(TMAZ)和热影响区(HAZ)。维氏硬度值从焊接线向 WNZ 增加,然后向 TMAZ 减小,最后通过 HAZ 向母材增加,与所有热影响焊接区相比,HAZ 的硬度更高。2219Al 合金 FSW 接头的显微硬度、屈服强度和拉伸强度均有所提高,这是由于镉含量为 0.06 wt% 时进行了微合金化,从而导致晶粒不断细化。而焊接接头的拉伸延展性、韧性和冲击韧性则因镉的微量添加而降低。在 FSW 操作后,所研究的合金在各自的焊点上保持了显著的机械强度、延展性和韧性。据观察,镉是一种潜在的微合金元素,可控制 2219Al 合金焊接接头的微观结构、细化晶粒尺寸并提高机械强度和硬度。目前的实验结果建立了结构与性能之间的相关性,从而验证了在痕量添加镉的 2219Al 合金上应用 FSW 技术的可能性,以获得理想的焊接质量,避免焊接缺陷。
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来源期刊
Materials Chemistry and Physics
Materials Chemistry and Physics 工程技术-材料科学:综合
CiteScore
8.70
自引率
4.30%
发文量
1515
审稿时长
69 days
期刊介绍: Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.
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