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搅拌摩擦沉积增材2219铝合金组织及性能
Microstructure and properties of 2219 aluminum alloy fabricated via additive friction stir deposition

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王瑞林 1 *   杨新岐 1 *   唐文珅 1   罗庭 1   赵耀邦 2   窦恩惠 2  
文摘 在主轴转速250~350 r/min、横向移动速度50~150 mm/min工艺参数下进行2219-T87铝合金搅拌摩擦沉积增材(additive friction stir deposition,AFSD)实验,探究工艺参数与多层热循环对沉积层宏观成形、微观组织和力学性能的影响。结果表明:在主轴转速250 r/min,移动速度100 mm/min工艺参数下可获得成形良好的单道16层增材试样。增材区晶粒尺寸发生显著细化,在4~6 μm之间,细小等轴晶组织取代沉积棒料粗大的无规则晶粒组织。增材试样发生剧烈的动态再结晶,整体再结晶晶粒在80%以上,试样底部(第1层)受到多次热循环影响,再结晶晶粒达到91.8%。增材区域织构基本由Cube、Copper、P和RtB四种再结晶织构以及S、T和Brass织构构成。增材试样的硬度和抗拉强度相比于沉积棒料都明显降低,其中,第16层沉积层硬度最大为80HV,约为沉积棒料母材的55.6%;第1~8层沉积层硬度均匀在60HV。增材区水平(longitudinal direction, LD)方向第9~16层和1~8层的平均抗拉强度分别为243.0 MPa和219.3 MPa,约为母材的60.0%和52.9%;平均伸长率为19.4%和24.5%,分别约为母材的181.1%和229.0%。增材试样LD方向断裂模式均为韧性断裂。
其他语种文摘 The additive friction stir deposition(AFSD) experiment of 2219 aluminum alloy was conducted under the process parameters of the spindle rotational speed of 250-350 r/min and transverse speed of 50-150 mm/min,the effects of varying process parameters and multilayer thermal cycling on the macroscopic forming of deposited materials, microstructures and mechanical properties were investigated. The results show that well-formed single-pass 16-layer additive specimens can be successfully obtained under the process parameters of the spindle rotational speed of 250 r/min and the traverse speed of 100 mm/min. The grain size in the additive zone undergoes significant refinement, ranging from 4 to 6 μm, and the fine equiaxial crystal organization replaces the coarse irregular grain organization characteristic of the feed rod. The additive specimen undergoes intense dynamic recrystallization, with overall recrystallized grains above 80%,and the bottom of the specimen(the 1st Layer)is subjected to multiple thermal cycles, with recrystallized grains reaching 91.8%. The texture of the additive zone basically consists of four recrystallized textures(Cube, Copper, P and RtB), as well as S, Brass and T textures. Significant softening of the hardness and tensile strength of the additive specimens occurs. The maximum hardness of the 16th layer is 80HV,which is about 55.6% of the base material of the feed rod,the hardness of the 1st-8th layers is uniformly 60HV. The average tensile strength of Layer 9-16 and 1-8 in the LD(longitudinal direction) direction of the additive zone is 243.0 MPa and 219.3 MPa respectively, which is about 60.0% and 52.9% of the base material, the average elongation is 19.4% and 24.5%, which is about 181.1% and 229.0% of the base material respectively. The fracture modes in the LD direction of the additive specimens are all ductile fracture.
来源 航空材料学报 ,2024,44(1):152-162 【核心库】
DOI 10.11868/j.issn.1005-5053.2023.000158
关键词 搅拌摩擦沉积增材 ; 2219-T87铝合金 ; 微观组织 ; 力学性能
地址

1. 天津大学材料科学与工程学院, 天津, 300354  

2. 上海航天精密机械研究所, 上海, 201600

语种 中文
文献类型 研究性论文
ISSN 1005-5053
学科 金属学与金属工艺
基金 上海航天精密机械研究所产学研合作基金 ;  国家自然科学基金
文献收藏号 CSCD:7676473

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引证文献 1 篇

1 江小辉 层间距对棒材送进式搅拌摩擦沉积增材2219铝合金组织及力学性能影响 焊接学报,2025,46(2):102-111
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