采用Ag-Nb-Ti-Zr合金诱导晶粒细化和T1-Ω相协同强化实现2195-T8 AlLi合金双丝VPPA熔覆焊接接头的高强度

IF 6.8 1区工程技术 Q1 ENGINEERING, MANUFACTURING

Journal of Manufacturing Processes Pub Date : 2025-09-18 DOI:10.1016/j.jmapro.2025.09.030

Guihan Cui , Chunli Yang

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This dual-phase system achieved breakthrough weld properties in strength (maximum 572 MPa, 101.2 % BM) and hardness (187.9 HV<sub>0.2</sub>, 129.9 % BM), exceeding BM for the first time. T1 and Ω phases eliminated universal PFZ at conventional boundaries and enhanced maximum elongation to 6.9 %. 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引用次数: 0

摘要

铝铜锂合金熔焊接头普遍存在强度退化问题，这对实现高强度钢焊缝的贱金属匹配性能提出了重大挑战。这种限制源于粗糙的枝晶结构、共晶偏析和强化相不足。采用双线变极性等离子弧（VPPA）熔覆焊接工艺，对2195 AlLi合金与Ag/In-Nb-Ti-Zr合金进行了显微组织和性能调节。通过时效处理，获得了强度超过BM的VPPA焊接接头。系统研究了晶粒形貌和析出行为，阐明了显微组织演变和强化机制。结果表明，双线喂料和电弧包覆减少了热输入，抑制了粗晶的生长。Nb-Ti-Zr合金诱导Al₃（Ti, Zr, Nb， V）和βv′相。这些相通过包晶反应、提高成核速率和钉钉效应使晶粒细化，形成细小的等轴细胞和枝晶晶粒。由于cui空位结合能较低，Nb-Ti-Zr合金时效焊缝以θ′相为主，T1相形成较少。此外，铟（In）捕获了淬火空位，通过In- cu空位配合物促进θ′成核。完全T1相抑制和PFZ加宽降低了强度和伸长率。银（Ag）的加入促进了MgAg共簇的形成，提供了除淬火空位之外的T1成核位置，并促进了沉淀动力学。富MgAg的{111}Al GP带演化为t1样Ω期。该双相体系在强度（最大572 MPa， 101.2% BM）和硬度（187.9 HV0.2, 129.9% BM）方面均取得突破性的焊接性能，首次超过BM。T1和Ω相消除了常规边界处的PFZ，最大伸长率提高到6.9%。T1/Ω相的析出强化占总屈服强度增强的41.2%。

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Achieving high-strength 2195-T8 AlLi alloy double-wire VPPA cladding welded joint by Ag-Nb-Ti-Zr alloying induced grain refinement and T1-Ω phase synergistic strengthening

The prevalent strength degradation in fusion welded joints of Al-Cu-Li alloys poses significant challenges in achieving base metal (BM) matching properties like high-strength steel welds. This limitation stems from coarse dendritic structures, eutectic segregation, and insufficient strengthening phases. This study employed double -wire variable polarity plasma arc (VPPA) cladding welding process to weld 2195 AlLi alloy coupled with Ag/In-Nb-Ti-Zr alloying for microstructural and property regulation. With aging treatment, superior strength VPPA welded joints exceeding BM were obtained. A systematic investigation was conducted on grain morphology and precipitation behavior, elucidating microstructural evolution and strengthening mechanisms. The results showed that double-wire feed and arc cladding reduced heat input and suppressed coarse grain growth. Nb-Ti-Zr alloying induced Al₃(Ti, Zr, Nb, V) and β_v' phase. These phases refined grains through peritectic reactions, enhanced nucleation rates, and pinning effect, resulting in fine equiaxed cellular and dendritic grains. θ' phase dominated aged Nb-Ti-Zr alloying welds due to low CuLi vacancy binding energy, yielding minimal T1 phase formation. Indium (In) addition captured quenched vacancies, promoting θ' nucleation via In-Cu-vacancy complexes. Complete T1 phase suppression and PFZ widening degraded strength and elongation. Silver (Ag) addition promoted MgAg co-cluster formation, providing alternative T1 nucleation sites beyond quenching vacancies and promoting precipitation kinetics. The MgAg riched {111}_Al GP zones evolved into the T1-like Ω phase. This dual-phase system achieved breakthrough weld properties in strength (maximum 572 MPa, 101.2 % BM) and hardness (187.9 HV_0.2, 129.9 % BM), exceeding BM for the first time. T1 and Ω phases eliminated universal PFZ at conventional boundaries and enhanced maximum elongation to 6.9 %. Precipitation strengthening from T1/Ω phases contributed 41.2 % of total yield strength enhancement.

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来源期刊

Journal of Manufacturing Processes ENGINEERING, MANUFACTURING-

CiteScore

10.20

自引率

11.30%

发文量

833

审稿时长

50 days

期刊介绍： The aim of the Journal of Manufacturing Processes (JMP) is to exchange current and future directions of manufacturing processes research, development and implementation, and to publish archival scholarly literature with a view to advancing state-of-the-art manufacturing processes and encouraging innovation for developing new and efficient processes. The journal will also publish from other research communities for rapid communication of innovative new concepts. Special-topic issues on emerging technologies and invited papers will also be published.