1 沈阳航空航天大学材料科学与工程学院,沈阳 110000 2 The University of Queensland,Brisbane 4072, Australia
Effect of Friction Stir Processing Parameters and Water Cooling on Grain Refinement and Deformation Control of A356 Casting Aluminum Alloy
MA Lin1,2, SONG Yujian1, CUI Qinghe1, SHI Yao1, JI Shude1, LI Zhuang1
1 School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110000, China 2 The University of Queensland,Brisbane 4072, Australia
Abstract: A356 as-cast aluminum alloy can be widely used in aerospace and automobile manufacturing due to its advantages such as good processability, weldability and low cost. However, the casting defects, coarse grains and second phases of casting A356 aluminum caused the deterioration of mechanical properties and limited the applications in industry. Friction stir processing (FSP) is one of the most effective methods to solve the problems of casting A356 aluminum by eliminating casting defects, and refining grains and the second phases. In order to explore the internal relationship between FSP process and grain refinement, and realize the optimization of the structure and performance of as-cast A356 aluminum alloy, the effects of processing parameters and cooling processes on the processing zone forming, grain refinement, microhardness, and processing deformation are systematically analyzed. The results show that the strain and heat caused by the FSP rotation speed and the processing speed affect the grain refinement; the increase of the rotation speed can help the grain refinement by increasing the strain on the material, while the high heat is generated by the high rotation speed and the low processing speed at the same time, which will lead to grain growth. The water-cooling process can effectively suppress the grain growth and processing deformation. Besides, the accumulation of dislocations around the Si second-phase particles triggers local grain ultra-fineness.
马琳, 宋雨键, 崔庆贺, 石瑶, 姬书得, 李壮. 搅拌摩擦加工工艺及水冷对A356铸铝合金晶粒细化作用及变形控制[J]. 材料导报, 2021, 35(24): 24122-24127.
MA Lin, SONG Yujian, CUI Qinghe, SHI Yao, JI Shude, LI Zhuang. Effect of Friction Stir Processing Parameters and Water Cooling on Grain Refinement and Deformation Control of A356 Casting Aluminum Alloy. Materials Reports, 2021, 35(24): 24122-24127.
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2021, Vol. 35 
