2A12铝基复合材料表面损伤的预测.pdf

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1、?23?6?Vol.23 No.62 0 0 9?12?CHINESE JOURNAL OF MATERIALS RESEARCHDecember 2 0 0 9?Al2O3sf/2A12?(?710072)?Al2O3sf/2A12?,?L9(34)?9?Al2O3sf/2A12?,?.?:?,?;?,?,?.?,?,?,?.?,?,?,?,?TB331,TG37?1005-3093(2009)06-0616-06Prediction of surface damage for Al2O3sf/2A12composites by liquid infiltration-extrusion p

2、rocessLIU JianQI LehuaZHOU JimingSU Lizheng(School of Mechatronics,Northwestern Polytechnical University,Xi?an 710072)*Supported by National Natural Science Foundation of China No.50575185,the National Defense Pre-Research Foundation of China No.9140A18040709HK03,and the Foundation of Key Laboratory

3、 for AdvancedMaterials Processing of Education,No.2008004.Manuscript received March 25,2009;in revised form June 8,2009.*To whom correspondence should be addressed,Tel:(029)88460447,Email:ABSTRACTA model for predicting the surface damage of Al2O3sf/2A12 composites by liquidinfiltration-extrusion pro

4、cess was established,and the distribution of surface damage was obtained un-der nine groups of process parameters based on orthogonal experimental design.The influence of processparameters on the surface damage was investigated.The results show that the surface cracks usuallyform at the mould outlet

5、,which results from the inhomogeneous metal flow and the partial overheating.Pressure-keeping time is the dominant parameter for controlling the surface quality.Surface damage canbe effectively avoided by optimizing the process parameters.The simulated values basicly accord with theexperiment result

6、s.KEY WORDS composites,liquid infiltration-extrusion,surface damage,FEM,prediction?,?,?,?,?1.?,?*?50575185?9140A18040709HK03?2008004?.2009?3?25?;2009?6?8?.?:?,?.?,?2.?,?Al2O3sf/2A12?.?,?,?,?.?.?35?,?6?:?Al2O3sf/2A12?6176?:?Al2O3sf/2A12?6176?:?Al2O3sf/2A12?617?;?68?,?.?,?.?Al2O3sf/2A12?,?,?,?.1?Al2O3

7、sf/2A12?,?,?2A12,?,?,?,?.?,?,?1?.?,?.?,?529?,483?.?,?.?,?Al2O3sf/2A12?9,?=B0sinh1(/A)1/nexpQ/(nRT)(1)?1?Fig.1 Finite element model of liquid infiltration-extrusion process?.?10,?Al2O3sf/2A12?,?,?(1)?A?B0?n?Q?21013?40.65 MPa?3.7?224.053 kJ/mol.?,?R0f(,eq)deq C RTj RTm Rv,?,?,?,?.?,?.?2?,?30 s?.?,?6?8

8、?,?,?,?.3.2?2?5?,?5?.?,?,?0.51 mm,?.?:(1)?,?,?,?13;(2)?,?,?.?620?23?620?23?620?23?3Al2O3sf/2A12?(Tm=360?,Tj=760?,t=20 s,v=9 mm/s,D?)Fig.3 Damage distribution of Al2O3sf/2A12 composite by liquid infiltration-extrusion process(a)D=5.3 mm,(b)D=7.5 mm,(c)D=9.0 mm,(d)D=11 mm?4?Fig.4 Damage distribution f

9、rom center to surface ofworkpiece?3?Table 3 Range analysis resultsContentTmTjtvFirst level value0.2720.3940.2340.492Second level value0.4930.4890.2690.376Third level value0.3770.2590.6390.275Range R0.2210.2300.4050.217Order of range3214?,?.?,?5?Fig.5 Extruded bar with surface cracks?6?Fig.6 Extruded

10、 bar with sound surface?14;(3)?,?,?,?15.?,?,?6?:?Al2O3sf/2A12?6216?:?Al2O3sf/2A12?6216?:?Al2O3sf/2A12?621?.?,?,?.?,?.?2?6?8?,?6?.?,?.?,?.4?1.Al2O3sf/2A12?,?,?,?,?,?.2.?,?.?,?Tm=360?Tj=740?t=30 s?v=6 mm/s?Tm=320?Tj=760?t=30 s?v=3 mm/s?,?,?.3.?Al2O3sf/2A12?,?.?1QI Lehua,LI Hejun,CUI Peiling,SHI Zhongk

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