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陈志强.Er和Sr共同作用对A356铝合金显微组织与力学性能的影响[J].稀有金属材料与工程(英文),2020,49(10):3382~3394.[chen zhiqiang.Combining effect of Er and Sr on the microstructure and mechanical properties of the as-casted A356 alloy[J].Rare Metal Materials and Engineering,2020,49(10):3382~3394.]
Combining effect of Er and Sr on the microstructure and mechanical properties of the as-casted A356 alloy
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Received:September 25, 2019  Revised:November 27, 2019
DOI:
Key words: Al-10Er-5Sr master alloy  Modification and grain refinement  Combining effect  Mechanical properties
Foundation item:国家重点研发计划项目(2016YFB0101205)
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chen zhiqiang  
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Abstract:
      In order to investigate the combing effect of Er and Sr on the microstructure and mechanical properties of A356 alloy, Al-10Er-5Sr master alloy was fabricated and its microstructure and phase compositions were investigated. The optimal percentage of Al-10Er-5Sr in A356 alloy was obtained according to the evolution of microstructure and mechanical properties. The results showed that α-Al, Al4Sr and Al3Er were the main phases in Al-10Er-5Sr. In addition, the aluminum alloy with 0.6 wt% Al-10Er-5Sr exhibited optimal microstructure and mechanical properties, with the secondary dendrite arm spacing (SDAS) decreasing to 20.2 μm and acicular-like eutectic silicon transforming to fibrous. Due to the improved microstructure, the ultimate tensile strength of the alloy (with 0.6wt% Al-10Er-5Sr) increased to 203.5 MPa, which are much better than that of untreated A356 aluminum alloy. Finally, the grain refinement and modification mechanisms were discussed.