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《金属学报(英文版)》 2008-03
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RECIPROCATING EXTRUSION OF IN SITU Mg_2Si REINFORCED Mg-Al BASED COMPOSITE

Z.M.Zhang~* C.J.Xu X.F.Guo S.Z.Jia School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China  
Mg_2Si reinforced Mg-Al based composite with high amount of silicon was prepared by permanent mould casting,and then extruded by reciprocating extrusion (RE) after the composite was processed by homogenization heat treatment.The effect of RE process- ing on the morphology and size of Mg_2Si and the mechanical properties of the com- posite were investigated,to develop new ways to refine the Mg_2Si phase and improve its shape.The result showed that RE was very useful in refining the Mg_2Si phase. The more the RE processing passes,the better the refining effect would be.Moreover, the uniform distribution of Mg_2Si phases would be more in the composite.After the composite was processed by RE for 12 passes,most Mg_2Si phases were equiaxed,with granular diameter below 20μm,and distributed uniformly in the matrix of the com- posite.The mechanical properties of the composite could be increased prominently by RE processing,and were much higher than that in the as-cast state.As the tem- perature rises,the tensile strength is reduced.For the composite RE processed for 12 passes,the tensile strength,yield strength,and elongation are 325.9 MPa,211.4 MPa, and 3.3% at room temperature,whereas,288.2 MPa,207.7 MPa,and 7.8%,respec- tively,at 150℃.In comparison with the properties at room temperature,the tensile strength and yield strength are high and only decrease by 11.6% and 1.8% at 150℃. The Mg2Si reinforced Mg-Al based composite possesses good heat resistance at 150℃. The excellent resistance to effect of heat is attributed to the high melting tempera- ture and good thermal stability of fine Mg_2Si phases,which are distributed uniformly in the composite,and effectively hinder the grain boundary gliding and dislocation movement.
【CateGory Index】: TB33
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