The Microstructure and Mechanical Properties of Hyper Eutectic Al-Si Alloy during Hot Extrusion Process
In this paper, the process parameters of hot extrusion of the hyper eutectic Al-Si alloy that has been dealt by electromagnetic stirring are studied. The results indicated, the ultimate tensile strength of the alloy reaches 229.5 MPa, the Elongation reaches 4. 6％ after extruded with extrusion ratio 10. Compared with extruded with extrusion ratio 20, the ultimate tensile strength reaches 263.2 Mpa, the elongation reaches 5.4％ , which indicates that the mechanical properties is obviously promoted. Primary Si phase, eutectic Si, Mg2Si,Al-Si-Ni-Cu-La-Ce and Al-Si-Mn-Fe-Cr-Mo phases become fine at some different degrees after hot extruded, and the degrees of refinement is increased with extrusion ratio improved. After T6 heat treatment, the sharp corners of these phases become passivity, their surface is more rounder, and the mechanical properties is enhanced even more, the ultimate tensile strength of the alloy reaches 335. 3 MPa after extruded with extrusion ratio 10. And it is increased to 353.6 MPa after extruded with extrusion ratio 20, however, the elongations is decreased a little.
hypereutectic Al-Si alloy electromagnetic stirring hot extrusion process pimary Si
Li Runxia Zhang Jia Chen Yujin Yuan Xiaoguang Li Rongde
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
267-270
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）