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周吉学,马百常.半连续铸造AZTYM66310合金铸态与热处理后的相组成与拉伸性能研究[J].稀有金属材料与工程(英文),2019,48(7):2258~2265.[Zhou Jixe and Ma Baichang.Phase Constitution and Tensile Properties of Semi-continuous Cast AZTYM66310 alloy at Casting State and Heat Treatment State[J].Rare Metal Materials and Engineering,2019,48(7):2258~2265.]
Phase Constitution and Tensile Properties of Semi-continuous Cast AZTYM66310 alloy at Casting State and Heat Treatment State
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Received:March 15, 2018  Revised:June 15, 2018
DOI:
Key words: Key words: AZTYM66310 magnesium alloy  semi-continuous casting  phase constitution  tensile properties  heat treatment
Foundation item:国家重点研发计划(2017YFB0103904);山东省自然科学基金(ZR2017PEE007)
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Zhou Jixe and Ma Baichang  
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Abstract:
      Abstract: The phase constitution, tensile properties and failure mechanism during tensile process of as-cast, as-solutioned and as-aged samples of a Mg-6Al-6Zn-3Sn-1Y-0.5Mn (AZTYM66310) magnesium alloy are investigated. The α-Mg primaries in the microstructure of as-cast AZTYM66310 alloy appear typical equiaxed dendrites morphology, and a large number of interdendritic phases formed during solidification, including Mg + Mg32 (Al, Zn) 49 eutectic, Mg2Sn divorced eutectic phases, Al2Y phases and Al8Mn4Y phases. After the solution treatment of 380℃ × 6h, the majority of Mg32(Al, Zn)49 phases and part of Mg2Sn phases were dissolved into the matrix, contributing the contents of Al, Zn and Sn in the matrix increasing significantly, while Al2Y phase and Al8Mn4Y phase not changing significantly. Solution treatment significantly improves the tensile strength and the elongation of the alloy. After aging treatment of 380 ℃ × 6h + 150 ℃ × 16h, a large number of nano-scaled particle reinforced phases precipitated in the alloy, especially near the grain boundary, contributing to the yield strength increasing to 187.4 MPa. During the tensile process of the alloy, the second phases in the structure first break or separate from the matrix, resulting in the generation of microcracks. And then these microcracks propagate along the grain boundaries, eventually causing the sample to fracture.