Ti、Sc对Al-Mg-Zr合金组织和力学性能的影响  

Effect of Ti,Sc Grain Refiner on Microstructure and Mechanical Properties of the Al-Mg-Zr Alloy

作　　者：余爱武 杨成刚[1] 陈和[1] 刘奋成[1] 王善林[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2014年第9期980-982,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51165038;51201087);江西省教育厅科技计划资助项目(GJJ13496;GJJ12453);航空科学基金资助项目(2011ZE56005);南昌航空大学研究生创新基金资助项目(YC2013005)

摘　　要：通过向Al-Mg-Zr合金中单独及复合添加微量的Ti、Sc元素,研究了Ti、Sc微合金化对Al-Mg-Zr合金微观组织和力学性能的影响。结果表明,在Al-Mg-Zr合金中单独添加0.15%的Ti能显著细化合金的铸态组织,使合金的力学性能得到明显提高。复合添加0.15%的Ti和0.2%的Sc时,细化效果更加显著,合金的平均晶粒尺寸仅为43μm,抗拉强度和伸长率分别提高了约70%和16.4%。原因是Ti、Sc复合添加形成了Al3Ti、Al3Sc、Al3(Ti,Zr)、Al3(Sc,Zr)和Al3(Sc,Ti)等多种金属间化合物相,共同充当形核质点,细化了合金组织。Effects of grain refiner on microstructure and mechanical properties of the Al-Mg-Zr alloy were investigated by adding trace Sc or Ti elements and compound adding Ti and Sc.The results show that the addition of 0.15%Ti can positively refine microstructure of the alloy and improve mechanical properties obviously.And the combined addition of 0.2%Sc and 0.15%Ti exhibits the desirable grain refining effect,where average grain size of the alloy is refined to only about 43μm,and the strength and elongation are improved by about 70%and 16.4%,respectively,which is largely attributed to the formation of Al3 Ti,Al3Sc,Al3（Ti,Zr）,Al3（Sc,Zr）and Al3（Sc,Ti）particles commonly to act as heterogeneous nuclei and to promote the grain refinement.

关 键 词：Al-Mg-Zr合金 微观组织 力学性能 形核质点 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG146.23[金属学及工艺—金属材料]