半固态挤压过共晶铝硅铁合金组织与性能的研究
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摘要
采用半固态反挤压成形方式制备了Al-17Si-3Fe-2Mn-4Cu-1Mg-1Ti合金。利用金相显微镜分析了合金铸态、电磁搅拌态、半固态挤压成形态的组织;利用SEM电子显微镜对拉伸断口进行观察。用拉伸试验机对合金铸态和半固态挤压成形态力学性能进行测试。试验结果表明:经过半固态挤压后,合金组织发生了明显细化,第二相长度和厚度减小,同时尖角发生钝化,且分布较均匀,半固态挤压成形后合金抗拉强度达到233.6 MPa,伸长率为1.6%。
The Al-17Si-3Fe-2Mn-4Cu-1Mg-1Ti alloy was prepared by semi-solid backward extruded process. The structure of as-cast, electromagnetic stirring and semi-solid extruding of alloy were analyzed by metallography microscope. Fracture was studied by scanning electronic microscope. Tensile testing machine was used to measure mechanics properties of as-cast and extruded alloy. The results show that compared with the as-cast alloy after extrusion, the structure of alloy obviously refined. The length and thickness of the second phase decreased, the sharp corner change rounding, and distribution becomes more homogeneous. Tensile strength of extruded alloy is 233.6 MPa, and extension percentage can get 1.6%.
The Al-17Si-3Fe-2Mn-4Cu-1Mg-1Ti alloy was prepared by semi-solid backward extruded process. The structure of as-cast, electromagnetic stirring and semi-solid extruding of alloy were analyzed by metallography microscope. Fracture was studied by scanning electronic microscope. Tensile testing machine was used to measure mechanics properties of as-cast and extruded alloy. The results show that compared with the as-cast alloy after extrusion, the structure of alloy obviously refined. The length and thickness of the second phase decreased, the sharp corner change rounding, and distribution becomes more homogeneous. Tensile strength of extruded alloy is 233.6 MPa, and extension percentage can get 1.6%.
引文
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[7]王娜,周志敏.近液相线半连续铸造过程中A390合金初生硅的形成机理[J].中国有色金属学报,2010,20(10):1895-1900.
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[11]李树索,赵爱民,毛卫民,等.半固态过共晶A1-Si合金显微组织中近球形α相形成机理的研究[J].金属学报,2000,36(5):545-549.
[2]钟鼓,吴树森,万里,等.半固态流变压铸Al-20%Si合金充型能力的研究[J].铸造,2010,59(10):1044-1048.
[3]Wu Y P,Wang S J,Li H,et al.A new technique to modify hypereutectic Al-24%Si alloys by a Si-P master alloy[J].J.Alloys Compound,2009,477:139-144.
[4]袁晓光,赵树国,李胜,等.半固态挤压Al-Si-Fe合金组织与性能[J].铸造,2006,55(5):466-468.
[5]Skjerpe P.Intermetallic phase formed duringDC-casting of an Al-0.25wt pct Fe-0.13wt pct Si alloy[J].Metallurgical Transaction,1987,18A(2):189-199.
[6]吴亮,金青林,蒋业华,等.Mn、Sr对铝硅合金中铁相的影响[J].铸造,2011,60(12):1185-1189.
[7]王娜,周志敏.近液相线半连续铸造过程中A390合金初生硅的形成机理[J].中国有色金属学报,2010,20(10):1895-1900.
[8]Lee J,Lee H,Kim M.Formation of spherical primary silicon crystals during semi-solid processing of hypereutectic A1-15.5wt%Si alloy[J].Scripta Meterialia,1995,32(12):1945-1949.
[9]Smith D M,Eady J A,Hogan L M.Crystallization of a faceted primary phase in a slurry[J].Metallurgical Transactions A,1991,22(2):549-575.
[10]Garat M,Blais S,Pluchon C.Aluminium semi-solidprocessing:from the billet to the finished part[C]//Proceeding of 5th International Conference on Semi-solid Processing of Alloysand Composites.Colorado,USA:Colorado School of Mines,1998:199-213.
[11]李树索,赵爱民,毛卫民,等.半固态过共晶A1-Si合金显微组织中近球形α相形成机理的研究[J].金属学报,2000,36(5):545-549.