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The forming process of thixo-forging alloy Al-7%Si/Al-17%Si was simulated by finite element software Deform-3D. The influences of billets initial temperature and die temperature on composite forming were investigated. Simulation results show that when the initial temperature of the bottom billet is low, the composite interface line is close to the upper surface of middle part, and the bottom is not filled entirely; however, when the initial temperature of the bottom billet is high, the billet temperature and stress at interface were seriously uneven. With the die temperature of die drops, the billets temperature drops fast and the stress increases fast, so the semi-solid forming time becomes inadequate. With the bad inhomogeneity of billet temperature and stress at interface, the lower part of the composite part is filled incompletely. When the initial temperature of top billet is 580 ℃, the initial temperature of bottom billet is 570 ℃, and the die temperature of die is 400 ℃, the thixo-forging is composited entirely and filled fully with constant and even billet temperature and stress at interface, straight interface line in the middle, thin central part of the composite part. The reliability of the simulation was verified by experiments.
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［1］井玉安, 董海雪, 孙本良, 等. 薄规格双金属复合板剪切强度的测试方法[J]. 热加工工艺, 2011, 40(12): 103-106.Jing Y A, Dong H X, Sun B L, et al. Test methods for shear strength of thin bi-metal sheet[J]. Hot Working Technology, 2011, 40(12): 103-106.
［2］孙显俊, 陶杰, 郭训忠, 等. Fe/Al复合管液压胀形数值模拟及试验研究[J]. 锻压技术, 2010, 35(3):66-70.Sun X J, Tao J, Guo X Z, et al. FE Simulation and practice of the hydro-bulging process for Fe/Al clad tube T-shape[J]. Forging & Stamping Technology, 2010, 35(3):66-70.
［3］Bulent K, Mustafa U. Interfacial microstructure of diffusion bonded inconel 738 and ferritic stainless steel couple[J]. Journal of Material Science & Technology, 2009, 25(4): 527-530.
［4］Yang Z, Zhou L, Dong J X, et a1. An inspiration of the method of manufacturing bi-material composite parts through semisolid metal processing[J]. Metallurgical and Materials Transactions A, 2011, 42A: 1709-1716.
［5］Yang Z, Zhou L, Dong J X. Observation of interface of two kinds of bi-metal composite parts prepared by thixo-forging[J]. Trans. Nonferrous Met. Soc. China, 2010, 20: 1579-1584.
［6］田文彤. 半固态触变模锻7A04合金的力学性能[J]. 锻压技术, 2012, 37(5): 63-66.Tian W T. Mechanical properties of semi-solid thixoforging 7A04 alloy parts[J]. Forging & Stamping Technology, 2012, 37(5): 63-66.
［7］沈利, 栗嵘光, 黎天保, 等. 触变成形亚/过共晶铝-硅双金属复合材料性能研究[J]. 轻合金加工技术, 2012, 39(9): 44-48.Shen L, Li R G, Li T B, et al. Mechanical properties of hypo/hyper-eutectic Al-Si bimetal bomposite prepared by thixo-forging[J]. Light Alloy Fabrication Technology, 2012, 39(9): 44-48.
［8］Tang P, Mei D Q, Zhou H H, et al. Experimental study on the reheating process for A356 alloy in thixoforming[J]. Advanced Materials Research, 2011, （154/155）:1324-1329.
［9］Kang C G, Youn S W, Seo P K. The effect of globular microstructure size on the mechanical properties in reheating process of aluminum alloys[J]. Journal of Materials Engineering and Performance, 2004, 13(2): 172-184.
［10］Nguyen T G, Favier D, Suery M. Theoretical and experimental study of the isothermal mechanical behavior of alloys in the semi-solid state[J]. International Journal of Plasticity, 1994, 10(6): 663-693.
［11］罗中华, 张质良, 杨红亮. A356合金半固态流动特性的研究[J]. 热加工工艺, 2008, 37(17): 1-5.Luo Z H, Zhang Z L, Yang H L. Investigation of flow behavior of A356 semi-solid alloy[J]. Hot Working Technology, 2008, 37(17): 1-5.
［12］Hogg S C, Atkinson H V, Kapranos P. Semi-solid rapid compression testing of spray-formed hypereutectic Al-Si alloys[J]. Metallurgical and Materials Transactions A,2004, 35A(3): 899-910.
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