镁含量对挤压铸造Al-10Si-2.5Cu-xMg合金显微组织及力学性能的影响
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摘要
通过添加不同含量的镁制备出Al-10Si-2.5Cu-xMg(x=0.5%,1.0%,1.5%和2.0%)合金,研究镁含量对Al-10Si-2.5Cu合金组织及力学性能的影响。结果表明:随着镁含量的增加,铸态合金显微组织中的共晶硅得到了细化,而T6热处理使得合金显微组织中的硅相溶断并且球化;当镁含量为1.5%时,铸态和T6态合金的抗拉强度分别达到最大值290 MPa和305 MPa;铸态合金的硬度在镁含量为2.0%时达到最大值112 HV5,T6态合金的硬度在镁含量为1.5%时达到最大值127 HV5;铸态合金的拉伸断口中存在一定量的解理面和少量的韧窝,断裂方式由准解理断裂向脆性断裂转变。
Al-10Si-2.5Cu-xMg(x = 0.5%,1%,1.5% and 2%) alloys were prepared by adding different content of magnesium.The effect of magnesium content on the microstructure and mechanical properties of Al-10Si-2.5Cu alloy was investigated.The results show that the eutectic silicon in the microstructure of the as-cast alloy is refined with the increase of the magnesium content,and the T6 heat treatment makes the silicon phase disintegration and spheroidization in the microstructure of the alloys.When the magnesium content is 1.5%,the tensile strengths of the as-cast and T6-state alloys reach the maximum values of 290 MPa and 305 MPa,respectively.The hardness of the ascast alloy reaches a maximum of 112 HV5 at a magnesium content of 2.0%,and the hardness of the T6 alloy reaches a maximum of 127 HV5 at a magnesium content of 1.5%.There are a certain amount of cleavage planes and a small amount of dimples in the fractures of as-cast alloys,and the fracture mode changes from quasi-cleavage fracture to brittle fracture with the increase of the magnesium content.
Al-10Si-2.5Cu-xMg(x = 0.5%,1%,1.5% and 2%) alloys were prepared by adding different content of magnesium.The effect of magnesium content on the microstructure and mechanical properties of Al-10Si-2.5Cu alloy was investigated.The results show that the eutectic silicon in the microstructure of the as-cast alloy is refined with the increase of the magnesium content,and the T6 heat treatment makes the silicon phase disintegration and spheroidization in the microstructure of the alloys.When the magnesium content is 1.5%,the tensile strengths of the as-cast and T6-state alloys reach the maximum values of 290 MPa and 305 MPa,respectively.The hardness of the ascast alloy reaches a maximum of 112 HV5 at a magnesium content of 2.0%,and the hardness of the T6 alloy reaches a maximum of 127 HV5 at a magnesium content of 1.5%.There are a certain amount of cleavage planes and a small amount of dimples in the fractures of as-cast alloys,and the fracture mode changes from quasi-cleavage fracture to brittle fracture with the increase of the magnesium content.
引文
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[2]Chung I G,Bolouri A,Kang C G.A study on semisolid processing of A356 aluminum alloy through vacuum-assisted electromagnetic stirring[J].International Journal of Advanced Manufacturing Technology,2012,58(1/4):237-245.
[3]Jiang W M,Fan Z T,Chen X,et al.Combined effects of mechanical vibration and wall thickness on microstructure and mechanical properties of A356 aluminum alloy produced by expendable pattern shell casting[J].Materials Science and Engineering:A,2014,619:228-237.
[4]Alhawari K S,Omar M Z,Ghazali M J,et al.Dry sliding wear behaviour of thixoformed hypoeutectic Al-Si-Cu alloy with different amounts of magnesium[J].Composite Interfaces,2016,23(6):519-531.
[5]杜康.半固态铸造Al-Si-Cu-Mg合金热处理工艺及强化机理研究[D].北京:北京有色金属研究总院,2017.Du Kang.Heat treatment process and strengthening mechanism research on semi-solid casting Al-Si-Cu-Mg aluminum alloy[D].Beijing:General Research Institute for Nonferrous Metals,2017.
[6]官鑫,薛林涛.Mg和Cu对铸造Al-Si-Cu-Mg合金组织与性能的影响[J].铸造技术,2018(3):543-545.Guan Xin,Xue Lintao.Effect of Mg and Cu on microstructure and properties of Al-Si-Cu-Mg alloy[J].Foundry Technology,2018(3):543-545.
[7]李润霞,刘兰吉,史原脊,等.挤压铸造对过共晶Al-Si-Cu-Mg合金组织与性能的影响[J].铸造,2017,66(4):367-371.Li Runxia,Liu Lanji,Shi Yuanji,et al.Effect of squeeze casting on microstructures and mechanical properties of hypereutectic Al-Si-Cu-Mg alloy[J].Foundry,2017,66(4):367-371.
[8]鄂猛,屈华,张旭,等.Mg含量对Al-5.3Cu-xMg-0.6Ag合金组织与时效行为的影响[J].辽宁工业大学学报(自然科学版),2016,36(5):330-333.E Meng,Qu Hua,Zhang Xu,et al.Effects of Mg addition on microstructures and aging behaviour of Al-5.3Cu-x Mg-0.6Ag alloys[J].Journal of Liaoning University of Technology(Natural Science Edition),2016,36(5):330-333.
[9]李润霞,李荣德,吕伟,等.固溶处理对铸造Al-Si-Cu-Mg合金组织与性能的影响[J].中国有色金属学报,2007,17(2):193-199.Li Runxia,Li Rongde,LüWei,et al.Effects of solution heat treatment on microstructures and properties of Al-Si-Cu-Mg cast alloys[J].Transactions of Nonferrous Metals Society of China,2007,17(2):193-199.
[10]黄晓锋,田载友,朱凯,等.压铸铝合金及压铸技术的研究进展[J].热加工工艺,2008,37(17):137-141.Huang Xiaofeng,Tian Zaiyou,Zhu Kai,et al.Study and application of die-casting aluminum alloy and die-casting technology[J].Hot Working Technology,2008,37(17):137-141.
[11]陈忠伟,介万奇.Mg含量对Al-Si-Mg铸造合金微观组织与力学性能的影响[J].材料科学与工程学报,2004,22(5):647-652.Chen Zhongwei,Jie Wanqi.Effects of Mg on the microstructure and mechanical property of Al-Si-Mg casting alloys[J].Journal of Materials Science and Engineering,2004,22(5):647-652.
[12]Wu C T,Lee S L,Hsieh M H,et al.Effects of Mg content on microstructure and mechanical properties of Al-14.5Si-4.5Cu alloy[J].Materials Science and Engineering A,2010,485(1):461-467.
[13]焦文祝,荀诗文,吴雪丰,等.Mg含量对Al-Si-Cu-Mg合金组织和力学性能的影响[C]//2012年中国铸造活动周论文集.2012:570-575.Jiao Wenzhu,Xun Shiwen,Wu Xuefeng,et al.Effect of Mg content on microstructure and mechanical properties of Al-Si-Cu-Mg alloy[C]//2012 China Foundry Congress.2012:570-575.
[14]Nemri Y,Gueddouar B,Benamar M E A,et al.Effect of Mg and Zn contents on the microstructures and mechanical properties of Al-Si-CuMg alloys[J].International Journal of Metalcasting,2017,12(1):1-8.
[15]Mandal A,Chippa N,Jayasankar K,et al.Effect of high magnesium content on microstructure of Al-7Si alloy[J].Materials Letters,2014,117(7):168-170.
[16]Alhawari K S,Omar M Z,Ghazali M J,et al.Microstructural evolution during semisolid processing of Al-Si-Cu alloy with different Mg contents[J].Transactions of Nonferrous Metals Society of China,2017,27(7):1483-1497.
[17]Abedi A,Shahmiri M,Amir E B,et al.Microstructural evolution during partial remelting of Al-Si alloys containing different amounts of magnesium[J].Journal of Materials Science and Technology,2013,29:971-978.
[18]Salleh M S,Omar M Z,Syarif J.The effects of Mg addition on the microstructure and mechanical properties of thixoformed Al-5%Si-Cu alloys[J].Journal of Alloys and Compounds,2015,621:121-130.