Microstructural characteristics and deformation behaviors of an Al–Mg–Si alloy with improved strength and conductivity processed by continuous casting and expansion extrusion
Microstructural characteristics and deformation behaviors of an Al–Mg–Si alloy with improved strength and conductivity processed by continuous casting and expansion extrusion
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连铸扩挤压Al-Mg-Si合金的显微组织特征及变形行为
DOI：
10.1016/j.jmrt.2022.11.156
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发表时间：
2023-01
期刊：
影响因子：
--
通讯作者：
Jie Teng
中科院分区：
文献类型：
--
作者：
Zeye Chen;Ruiqing Lu;Shuwei Zheng;Jie Tang;Fulin Jiang;Lei Deng;Liang Huang;Jie Teng
铝镁硅合金导体的工业应用仍然面临着强度和导电性权衡的巨大挑战。本文对6101铝合金棒材进行了特殊的强剪切连续膨胀挤压成形（CEEF）工艺，结合各种人工时效处理，使棒材的力学性能和电性能得到改善。结果表明：在冷却速度快的连铸棒材中，可获得晶间相少、固溶度高的细化枝晶；在CEEF薄片中，观察到从核心到表面的晶粒尺寸梯度分布，其中动态恢复（DRV）和动态再结晶（DRX）显著细化了加工薄片的晶粒尺寸。分别对挤压态、固溶态和预变形态合金试样进行人工时效处理，发现析出响应不同。预变形合金中的高密度位错充当了固溶原子快速扩散的管道，加速了固溶原子的析出，降低了基体固溶原子含量，减轻了电子散射现象。因此，结合上述优化策略，可以同时获得强度和电导率的提高。
The industrial applications of Al–Mg–Si alloys conductors still meet the big challenges of strength and conductivity trade-off. In the present work, a special continuous expansion extrusion forming (CEEF) with violent shearing deformation was performed on continuous cast 6101 Al alloy rods to process the sheets with improved mechanical and electrical properties by combining various artificial aging treatments. The results showed that refined dendrites with few intergranular phases and high supersaturation solid solubility could be obtained in the continuous casted rods with fast cooling rate. In the CEEF sheet, the gradient distribution of grain size from the core to the surface of the sheet was observed, where the grain size of processed sheet was refined remarkably by dynamic recovery (DRV) and dynamic recrystallization (DRX). When artificial aging was conducted on the as-extruded, solid-solution and pre-deformed alloy specimens respectively, different precipitation responses were found. The high-density dislocations in the pre-deformed alloy acted as pipes for rapid diffusion of solid solution atoms to accelerate their precipitation, reducing the matrix solid solution atom content and mitigating electron scattering phenomena. As a result, simultaneous improvements of strength and conductivity could be obtained by combining the above optimized strategies.
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DOI：
10.1016/j.msea.2013.01.075
发表时间：
2013-06
影响因子：
6.4
作者：
Hui Zhang;Fulin Jiang;X. Shang;Luoxing Li
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DOI：
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影响因子：
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作者：
Sun, L. X.;Tao, N. R.;Lu, K.
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