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[TIAN Chao-bo,YANG Xin-qi,TANG Wen-shen and XU Yong-sheng.Microstructure features and mechanical properties of single-pass multilayer 6061 aluminium alloy based on friction extrusion additive manufacturing[J].Rare Metal Materials and Engineering,2022,51(8):2870~2880.]
Microstructure features and mechanical properties of single-pass multilayer 6061 aluminium alloy based on friction extrusion additive manufacturing
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Received:November 30, 2021  Revised:January 14, 2022
DOI:
Key words: Solid-state additive manufacturing  6061 aluminium alloy  Microstructure  Mechanical properties  Precipitated phase
Foundation item:国家自然科学基金面上项目(项目号51775371和52175356)天津市自然科学基金重点资助项目(项目号19JCZDJC39200)
Author NameAffiliation
TIAN Chao-bo,YANG Xin-qi,TANG Wen-shen and XU Yong-sheng  
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Abstract:
      The friction extrusion additive manufacturing (FEAM) process of 6061 aluminium alloy was successfully performed. The microstructure features, interface bonding mechanism and mechanical properties of single-pass one-layer, two-layer and nine-layer additive specimens were discussed in detail. It is found that under the process conditions of a spindle speed of 600 rpm and a moving speed of 300 mm/min, completely dense and defect-free 6061one-layer, two-layer and nine-layer additive specimens with layer thickness and width of 4 mm and 32 mm are obtained. The uniform microstructures of additive specimens are composed of fine and uniform equiaxed grains. The average grain size of one-layer and nine-layer additive specimens are 5.63±1.66 μm and 8.31±1.68 μm, which are significantly refined compared with the bar base metal (24.21±5.3 μm) . In the microstructures of single-pass one-layer additive specimen, the main strengthening phase b2 is almost completely dissolved and phase b′ is coarsed, so the average hardness is 64.7% of the bar base metal. The additive interface realizes metallurgical bonding and has the most significant degree of grain refinement. The hardness of interface reduce to 56.9% of the bar base metal because the strengthening phases b2 and b′ are almost completely dissolved. The average hardness of nine-layer specimen after multiple thermal cycles is 50.6% of the base metal. The nine-layer additive specimen exhibits excellent strength and toughness matching. The average tensile strength and elongation along the length direction of the additive specimen are 194 MPa and 34.6%, respectively, and the average tensile strength and elongation along the vertical direction of the additive specimen is 151.0 MPa and 10.4%, respectively.