Sr变质对Al-Si-Mg合金的流动性、力学性能和导热系数的影响
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摘要
采用扫描电镜、拉伸试验机和激光导热仪,研究了Sr变质处理对Al-3.2Si-0.8Mg合金铸造流动性、导热系数与力学性能的影响。结果表明:随着共晶Si相形貌的细化,Al-3.2Si-0.8Mg合金的上述性能逐渐提高。当Al-10Sr合金添加量为0.4%时,该合金的铸造流动性试样长度为922 mm(提高了8.2%),抗拉强度和伸长率分别为243 MPa(提高了3.8%)和11.3%(提高了11.9%),导热系数为187.6 W/(m·K)(提高了3.1%)。
The effects of Sr modification on casting fluidity, thermal conductivity and mechanical properties of as-cast Al-3.2Si-0.8Mg alloy was researched by scanning electron microscope, tensile testing machine and flash thermal conductivity meter. The results indicate that with the modification of eutectic Si phase, the above properties were improved. When the addition of Al-10 Sr alloy is 0.4%, the length of casting fluidity sample is 922 mm, the tensile strength and elongation are 243 MPa and 11.3% respectively, and the thermal conductivity is187.6 W/(m·K). Compared with that of Al-3.2Si-0.8Mg alloy without modification, the above properties were increased by 8.2%, 3.8%, 11.9% and 3.1% respectively.
The effects of Sr modification on casting fluidity, thermal conductivity and mechanical properties of as-cast Al-3.2Si-0.8Mg alloy was researched by scanning electron microscope, tensile testing machine and flash thermal conductivity meter. The results indicate that with the modification of eutectic Si phase, the above properties were improved. When the addition of Al-10 Sr alloy is 0.4%, the length of casting fluidity sample is 922 mm, the tensile strength and elongation are 243 MPa and 11.3% respectively, and the thermal conductivity is187.6 W/(m·K). Compared with that of Al-3.2Si-0.8Mg alloy without modification, the above properties were increased by 8.2%, 3.8%, 11.9% and 3.1% respectively.
引文
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[3]罗淞,林高用,曾菊花,等.硬质相对6061铝合金异型散热型材表面质量的影响[J].中国有色金属学报,2015,21(7):1521-1526.
[4]黄泽涛,袁鸽成,刘洪,等.6061铝合金壁板型材等温挤压的研究[J].材料研究与应用,2012,6(1):29-33.
[5]郑亚虹,王自东.复杂薄壁精密铝合金铸件铸造技术进展[J].铸造,2010,59(8):796-799.
[6]邢书明.挤压铸造铝合金材料及其工艺性能[J].铸造,2015,64(7):628-631.
[7]Cho Y H,Kim H W,Kim W,et al.The Effect of Ni additions on the microstructure and cast ability of low Si added Al casting alloys[J].Materials Today:Proceedings,2015,2(10):4924-4930.
[8]Zhang Peng,Li Zhenming,Liu Baoliang,et al.Improved tensile properties of a new aluminum alloy for high pressure die casting[J].Materials Science and Engineering A,2016,651:376-390.
[9]彭勇,王顺成,郑开宏,等.铸锻复合一体化成形6061铝合金的组织和力学性能[J].中国有色金属学报,2014,24(2):325-334.
[10]齐丕骧.变形铝合金挤压铸造[J].特种铸造及有色合金,2008,28(10):769-772.
[11]牛艳萍,赵禹凯,王顺成,等.Si含量对Al-Si-Mg合金铸造流动性、热导率和力学性能的影响[J].铸造,2016,65(4):366-370.
[12]代雨成,樊自田,蒋文明,等.Sr变质对ZL114A合金共晶硅形貌和拉伸性能的影响[J].铸造,2014,63(3):221-231.
[13]Chang Joonyeon.Crystal morphology of eutectic Si in rare earth modified Al-7wt%Si alloy[J].Journal of materials science letters,2001,20:1305-1307.
[14]Lu Shuzu,Hellawell A.The mechanisms of silicon in Al-Si alloys crystal growth[J].Journal of Crystal Growth,1985,73(2):316-328.
[15]Ravi K R,Pillai R M,Amaranathan K R,et al.Fluidity of aluminum alloys and composites:a review[J].Journal of Alloys and Compounds,2008,456(1):201.
[16]朱必武,李落星,刘筱,等.薄壁铝合金压铸充型过程中的流动特征及其凝固组织[J].中国有色金属学报,2014,24(1):43.
[17]Liu L,Samuel A M,Samuel F H.Characteristics of a-dendritic and eutectic structures in Sr-treated Al-Si casting alloys[J].Journal of materials science.2004,39:215-224.
[18]Shi D,Li D,Gao G.Relation between surface tension and microstructural modification in Al-Si alloys[J].Materials Characterization,2008,59(11):1541-1545.
[19]郭有军,史志铭.Sr变质对铸造Al-Si-Mg合金组织和熔体粘度的影响[J].内蒙古工业大学学报:自然科学版,2007,26(1):21-25.
[20]代雨成,樊自田,蒋文明,等.Sr变质对ZL114合金共晶硅形貌和拉伸性能的影响[J].铸造,2014,63(3):221-231.
[21]张建新,高爱华.热处理工艺对Al-Mg-Si系合金导热性能的影响[J].特种铸造及有色合金,2011,31(10):911-913.
[22]Shin J S,Ko S H,Kim K T.Development and characterization of low-silicon cast aluminum alloys for thermal dissipation[J].Journal of Alloys and Compounds,2015,664:673-686.