Effect of temperature on creep aging behavior of the nugget zone of AA2195 AlLi alloy produced by friction stir welding

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-09-23 DOI:10.1016/j.matchar.2024.114408

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Abstract

This paper aims to study the effect of temperatures on the creep aging behaviors of the nugget zone (NZ) of AlLi alloy by friction stir welding (FSW). The results suggest that the creep strain of the NZ experiences a significant increase as the temperature rises, surpassing that of the base material (BM) at equivalent temperatures. In the case of NZ, the elevation of temperature from 160 to 190 °C induces a pronounced increase in both the size and volume fraction of the T₁ phase, which results in a substantial enhancement in the strength. In contrast, the peak-aged strengths of the BM exhibit minimal variation in this temperature range. As the temperature increases, the time required for the BM to reach its peak aging state significantly decreases, whereas the changes in the NZ are less pronounced. For the NZ, the time required to reach the peak aging state is obviously longer than that for the BM. Although the average length of the T₁ phase in the NZ is markedly greater than that in the BM, its volume fraction and number density in the NZ are considerably lower than those in the BM, resulting in inferior strength reinforcement in the NZ compared to the BM after creep aging.

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温度对搅拌摩擦焊生产的 AA2195 AlLi 合金金块区蠕变时效行为的影响

本文旨在研究温度对搅拌摩擦焊（FSW）铝锂合金金块区（NZ）蠕变时效行为的影响。结果表明，随着温度的升高，NZ 的蠕变应变显著增加，超过了同等温度下母材（BM）的蠕变应变。就 NZ 而言，温度从 160 °C 升至 190 °C 会导致 T1 相的尺寸和体积分数明显增加，从而大幅提高强度。相比之下，BM 的峰值老化强度在此温度范围内变化极小。随着温度的升高，BM 达到峰值老化状态所需的时间明显缩短，而 NZ 的变化则不太明显。就 NZ 而言，达到峰值老化状态所需的时间明显长于 BM。虽然 NZ 中 T1 相的平均长度明显大于 BM 中的 T1 相，但 NZ 中 T1 相的体积分数和数量密度却大大低于 BM 中的 T1 相，导致 NZ 在蠕变老化后的强度强化效果不如 BM。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.