摘要
对过共晶Al-Si-Fe合金进行了搅拌摩擦加工(FSP),研究了不同FSP转速和道次对过共晶铝硅合金强度和组织的影响。其中,选择搅拌转速分别为750r/min、1050r/min和1500r/min,搅拌道次分别为1道、2道、3道。结果表明,合金经过FSP加工后,硅、含铁相等硬质第二相颗粒强烈细化,但随着搅拌转速的提高,硬质相颗粒细化效果变差,第二相颗粒平均粒径由11.7μm变为15.5μm。随着搅拌道次的增加,细化效果越发显著,第二相颗粒的平均粒径由11.7μm变为8.9μm。FSP加工后材料抗拉强度和延伸率较铸态大幅度提高。当搅拌转速为750r/min、道次为3时,材料的拉伸强度和延伸率分别由铸态的48MPa、0.43%提高到150MPa、2.97%。因此,经FSP后过共晶铝硅合金组织和力学性能得到极大改善。
Hypereutectic Al-Si-Fe alloys were treated by friction stir processing （FSP）,the effect of stirring speed and pass of FSP on the strength and microstructure were also investigated.The stirring speed was 750 r/min,1050 r/min and 1500 r/min,respectively.FSP passes were 1,2 and 3,respectively.The results show that hard particles such as Si and Fe-rich phase were greatly refined,but the effect of refinement decreased with the stirring speed increasing,the average particle diameter of the second phase particles change into 15.5μm from 11.7 μm.With the increase in passes,effect of the refinement of the hard particles was strengthened,the average particle diameter of the second phase particles change into 8.9 μm from 11.7 μm.In the condition og 750 r/min stirring speed and 3 FSP passes,the tensile strength and elongation of the FSP alloy is improved from 48 MPa and 0.43％ boost to 150 MPa and 2.97 ％.respectively.Therefore,the microstructure and mechanical properties of the hypereutectic Al-Si-Fe alloy were greatly improved by FSP.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2014年第6期107-110,共4页
Materials Reports
基金
云南省科技厅省应用基础研究项目(2008ZC022M)
四川理工学院培育项目(2013PY05)
