搅拌时间对P变质的Al-20%Si合金初生硅尺寸与力学性能的影响
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摘要
对Cu-9%P中间合金变质的Al-20%Si合金熔体进行了搅拌处理,研究了搅拌时间对P变质的Al-20%Si合金初生硅尺寸与力学性能的影响。研究表明:机械搅拌使Cu-P合金周围形成的Al P细小,同时使其弥散地分布于Al-Si合金熔体中,作为初生硅的结晶核心。随着搅拌时间的增加,初生硅由棱角尖锐、粗大的块状变为尖角钝化的颗粒状,搅拌时间从8 min增加到28 min时,初生硅尺寸由56.56μm减小到21.74μm,试样的抗拉强度由96.2 MPa增加到164.3 MPa,提高了70.8%,伸长率由1.5%提高到2.5%,提高了66.7%。
The Al-20%Si alloy melt modified by Cu-9%P intermediate alloy was stirred. The influence of stirring time on the size of primary silicon and mechanical properties of Al-20%Si alloy modified by P was studied. The results show that mechanical stirring makes the Al P formed around Cu-P alloy small and distribute evenly in the melt, which becomes the core of the crystallization nucleus of primary silicon. With the increase of stirring time, the primary silicon changes from sharp edge and thick block to sharp edge passivation particle. When the stirring time increases from 8 min to 28 min, the size of primary Si decreases from 56.56 μm to 21.74 μm, the tensile strength of the sample increases from 96.2 MPa to 164.3 MPa, which increases by 70.8%, and the elongation increases from 1.5% to 2.5%, which increases by 66.7%.
The Al-20%Si alloy melt modified by Cu-9%P intermediate alloy was stirred. The influence of stirring time on the size of primary silicon and mechanical properties of Al-20%Si alloy modified by P was studied. The results show that mechanical stirring makes the Al P formed around Cu-P alloy small and distribute evenly in the melt, which becomes the core of the crystallization nucleus of primary silicon. With the increase of stirring time, the primary silicon changes from sharp edge and thick block to sharp edge passivation particle. When the stirring time increases from 8 min to 28 min, the size of primary Si decreases from 56.56 μm to 21.74 μm, the tensile strength of the sample increases from 96.2 MPa to 164.3 MPa, which increases by 70.8%, and the elongation increases from 1.5% to 2.5%, which increases by 66.7%.
引文
[1]Liu J,Kevin C Y.On temperatures and tool wear in machining hypereutectic Al-Si alloys with vortex-tube cooling[J].International Journal of Machine Tools&Manufacture,2007,47:635-645.
[2]Zhan Q,Liu X F,Zhao D G,et al.Effects of trace Mn addition on the elevated temperature tensile strength and microstructure of a low-iron Al-Si piston alloy[J].Materials Letters,2008,62(14):2146-2149.
[3]Lasa L,Rodriguez-Ibabe J M.Wear behaviour of eutectic and hypereutectic Al-Si-Cu-Mg casting alloys tested against a composite brake pad[J].Materials Science and Engineering A,2003,363(1/2):193-202.
[4]Joseps S,Tewari A,Kumar S.The fracture characteristics of a near eutectic Al-Si based alloy under compression[J].Metallurgical and Materials Transactions A,2013,44(5):2358-2368.
[5]Wang Q L,Geng H R,Zuo M,et al.Effects of melt thermal rate treatment and modification of P and RE on hypereutectic Al-Si-Cu-Mg alloy[J].Materials Science and Technology,2013,29(10):1233-1240.
[6]Kobayashi K F,Hogan L M.The crystal growth of silicon in Al-Si alloys[J].Journal of Materials Science,1985,20:1961-1975.
[7]Yilmaz F,Atasoy O A,The influence of strontium[J].Journal of Crystal Growth,1992,118(3/4):377-384.
[8]Kim H J.Effect of calcium on primary silicon particle size in hypereutectic Al-Si alloys[J].Materials Science and Technology,2003,19:915-918.
[9]Lee T H,Ko H J,Jeong T S,et al.The effect of Sc on the microstructure and mechanical properties of hypereutectic Al-Si alloy fabricated by a gas atomization process[J].Current Nanoscience,2014,10(1):146-150.
[10]Xu C L,Wang H Y,Yang Y F,et al.Effect of Al-P-Ti-TiC-Nd2O3modifier on the microstructure and mechanical properties of hypereutectic Al-20%Si alloy[J].Materials Science and Engineering A,2007,452-453(15):341-346.
[11]Liu X F,Wu Y Y,Bian X F.The nucleation sites of primary Si in Al-Si alloys after addition of boron and phosphorus[J].Journal of Alloys and Compounds,2005,391:90-94.
[2]Zhan Q,Liu X F,Zhao D G,et al.Effects of trace Mn addition on the elevated temperature tensile strength and microstructure of a low-iron Al-Si piston alloy[J].Materials Letters,2008,62(14):2146-2149.
[3]Lasa L,Rodriguez-Ibabe J M.Wear behaviour of eutectic and hypereutectic Al-Si-Cu-Mg casting alloys tested against a composite brake pad[J].Materials Science and Engineering A,2003,363(1/2):193-202.
[4]Joseps S,Tewari A,Kumar S.The fracture characteristics of a near eutectic Al-Si based alloy under compression[J].Metallurgical and Materials Transactions A,2013,44(5):2358-2368.
[5]Wang Q L,Geng H R,Zuo M,et al.Effects of melt thermal rate treatment and modification of P and RE on hypereutectic Al-Si-Cu-Mg alloy[J].Materials Science and Technology,2013,29(10):1233-1240.
[6]Kobayashi K F,Hogan L M.The crystal growth of silicon in Al-Si alloys[J].Journal of Materials Science,1985,20:1961-1975.
[7]Yilmaz F,Atasoy O A,The influence of strontium[J].Journal of Crystal Growth,1992,118(3/4):377-384.
[8]Kim H J.Effect of calcium on primary silicon particle size in hypereutectic Al-Si alloys[J].Materials Science and Technology,2003,19:915-918.
[9]Lee T H,Ko H J,Jeong T S,et al.The effect of Sc on the microstructure and mechanical properties of hypereutectic Al-Si alloy fabricated by a gas atomization process[J].Current Nanoscience,2014,10(1):146-150.
[10]Xu C L,Wang H Y,Yang Y F,et al.Effect of Al-P-Ti-TiC-Nd2O3modifier on the microstructure and mechanical properties of hypereutectic Al-20%Si alloy[J].Materials Science and Engineering A,2007,452-453(15):341-346.
[11]Liu X F,Wu Y Y,Bian X F.The nucleation sites of primary Si in Al-Si alloys after addition of boron and phosphorus[J].Journal of Alloys and Compounds,2005,391:90-94.