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采用多道次搅拌摩擦加工技术(MFSP)对冷喷涂增材制造(CSAM)6061铝合金进行大面积加工改性。采用SEM、EBSD和XRD对CSAM试样和MFSP试样不同区域的微观组织进行了表征，并利用显微硬度和室温拉伸测试对其力学性能进行了研究。结果表明，CSAM试样存在大量微孔、裂纹缺陷，晶粒分布不均匀，大角度晶界占比仅为41.4%。相比CSAM试样，MFSP试样晶粒均匀并细化至2.09μm,大角度晶界占比升高至78.0%,位错密度显著降低。其中，加工区和界面区的晶粒分别细化至2.31和1.86μm,大角度晶界占比分别升高至72.8%和83.1%。相比加工区，界面区晶粒细化程度和大角度晶界占比更高，这是由于界面区经历了重复机械搅拌和热作用，促进了连续动态再结晶。MFSP试样平均显微硬度、极限抗拉强度和伸长率分别为58 HV、177 MPa和14.5%,相比CSAM试样分别提高了35%、101%和753%。
Abstract：The cold spray additive manufactured(CSAM) 6061 aluminum alloy was modified in a large area by multi-pass friction stir processing(MFSP). The microstructures of different zones of the CSAM sample and the MFSP sample were characterized by SEM, EBSD and XRD, and their mechanical properties were investigated by microhardness and tensile at room temperature tests. The results show that a large number of micropores and cracks are displayed in the CSAM samples, with an uneven grain distribution and a high proportion of high-angle grain boundaries(41.4%). Compared with the CSAM sample, the grains of the MFSP sample are more uniform and refined to 2.09 μm, the proportion of high-angle grain boundaries is increased to 78.0%, and the dislocation density is significantly reduced. The grains in the processed zone and interfacial zone are refined to 2.31 and 1.86 μm, and the proportions of high-angle grain boundaries are increased to 72.8% and 83.1%, respectively. The grain refinement and the proportion of high-angle grain boundaries in the interfacial zone are higher than those in the processed zone, which is attributed to the repeated mechanical stirring and thermal effects in the interfacial zone, promoting continuous dynamic recrystallization. The microhardness, ultimate tensile strength and elongation of the MFSP sample are 58 HV, 177 MPa and 14.5%, respectively, which represent improvements of 35%, 101% and 753% compared with the CSAM sample.
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基本信息:
中图分类号:TG146.21;TG453.9
引用信息:
[1]段佳兴,韩鹏,王文,等.多道次搅拌摩擦加工改性冷喷涂增材制造6061铝合金微观组织及力学性能[J].塑性工程学报,2025,32(12):194-201.
基金信息:
国家自然科学优秀青年科学基金资助项目(52222410); 国家自然科学基金面上项目(51974220); 陕西省杰出青年科学基金资助项目(2022JC-24); 中央引导地方科技发展资金资助项目(2024ZY-JCYJ-04-09)
2025-12-29
2025-12-29
2025-12-29