Y对AZ91D合金的组织与性能影响研究
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摘要
采用消失模铸造的方法制备了不同Y含量的AZ91D合金,研究了Y含量对AZ91D合金铸态组织、物相组成和力学性能的影响,并分析了Y元素的存在形式和作用机理。结果表明,在AZ91D合金中添加Y元素可以细化合金铸态组织,在Y含量为1%时AZ91D+Y合金的铸态组织可以达到最好细化效果;在合金中添加1%Y后,不仅会改变合金中β-Mg17Al12相的尺寸和分布,还会形成Al2Y相;在AZ91D合金中添加Y元素后,合金的抗拉强度、断后伸长率和布氏硬度都得到不同程度提高,在Y含量达到1%时取得最大值。
The AZ91 D alloy with different Y content was prepared by EPC process, the effects of Y content on microstructure, phase composition and mechanical properties of as-cast AZ91 D alloy were studied, and the existing form and mechanism of Y elements were also analyzed. The results show that the addition of Y element can refine the microstructure of as cast AZ91 D alloy, and the microstructure of as cast AZ91 D alloy can reach the best refinement effect when the content of Y is 1%. The grain size and distribution of the β-Mg17 Al12 phase in AZ91 D alloy will be changed with addition of 1%Y, and the Al2 Y phase will be precipitation. When Y element is added to AZ91 D alloy, the tensile strength,elongation after fracture and Brinell hardness of the alloy are improved to different degrees, and the maximum value is obtained when Y content reaches 1%.
The AZ91 D alloy with different Y content was prepared by EPC process, the effects of Y content on microstructure, phase composition and mechanical properties of as-cast AZ91 D alloy were studied, and the existing form and mechanism of Y elements were also analyzed. The results show that the addition of Y element can refine the microstructure of as cast AZ91 D alloy, and the microstructure of as cast AZ91 D alloy can reach the best refinement effect when the content of Y is 1%. The grain size and distribution of the β-Mg17 Al12 phase in AZ91 D alloy will be changed with addition of 1%Y, and the Al2 Y phase will be precipitation. When Y element is added to AZ91 D alloy, the tensile strength,elongation after fracture and Brinell hardness of the alloy are improved to different degrees, and the maximum value is obtained when Y content reaches 1%.
引文
[1]徐玉磊,张奎.微量钇对压铸AZ91D镁合金组织及力学性能的影响[J].热加工工艺,2018,47(1):79-82,87.
[2]张尧成,宋兵兵,张韦袆,等.热处理对汽车用AZ91镁合金微观组织和力学性能的影响[J].热加工工艺,2018,47(4):238-241.
[3] Zhang J S, Gao Y B, Pei L X, et al. Effect of P modifying on microstructures and mechanical properties of Si alloying AZ91 magnesium alloys[J]. Chinese Journal of Nonferrous Metals, 2006, 16(8):1361-1367.
[4] Bavister B D. Effects of Technological Factors on Average Mold-filling Velocity of Lost Foam Casting for Magnesium Alloys[J]. Light Alloy Fabrication Technology, 2005, 10(1):124-129.
[5] Zhao Z, Fan Z, Tang B, et al. Influence of pressure solidification on AZ91D magnesium alloy feeding in lost foam casting process[J].International Journal of Cast Metals Research, 2013, 24(24):13-21.
[6] Luo Q, Cai Q Z, Fan Z T, et al. Effects of Y on microstructure and property of heat treated AZ91D magnesium alloy prepared by lost foam casting process[J]. International Journal of Cast Metals Research, 2015, 25(6):341-346.
[7] Fan Z T, Ji S. Low pressure lost foam process for casting magnesium alloys[J]. Materials Science&Technology, 2005, 21(6):727-734.
[2]张尧成,宋兵兵,张韦袆,等.热处理对汽车用AZ91镁合金微观组织和力学性能的影响[J].热加工工艺,2018,47(4):238-241.
[3] Zhang J S, Gao Y B, Pei L X, et al. Effect of P modifying on microstructures and mechanical properties of Si alloying AZ91 magnesium alloys[J]. Chinese Journal of Nonferrous Metals, 2006, 16(8):1361-1367.
[4] Bavister B D. Effects of Technological Factors on Average Mold-filling Velocity of Lost Foam Casting for Magnesium Alloys[J]. Light Alloy Fabrication Technology, 2005, 10(1):124-129.
[5] Zhao Z, Fan Z, Tang B, et al. Influence of pressure solidification on AZ91D magnesium alloy feeding in lost foam casting process[J].International Journal of Cast Metals Research, 2013, 24(24):13-21.
[6] Luo Q, Cai Q Z, Fan Z T, et al. Effects of Y on microstructure and property of heat treated AZ91D magnesium alloy prepared by lost foam casting process[J]. International Journal of Cast Metals Research, 2015, 25(6):341-346.
[7] Fan Z T, Ji S. Low pressure lost foam process for casting magnesium alloys[J]. Materials Science&Technology, 2005, 21(6):727-734.