搅拌摩擦加工对Mg-2.67%Nd-0.5%Zn-0.5%Zr合金动态变形行为的影响  

Effect of Friction Stir Processing on Dynamic Deformation Behavior of Mg-2.67%Nd-0.5%Zn-0.5%Zr Alloy

作　　者：沙桂英[1] 吕勤云[1] 于涛[1] 孙晓光[1] 王洪顺[1] 

机构地区：[1]沈阳航空工业学院材料科学与工程学院,沈阳110036

出　　处：《航空材料学报》2010年第2期35-39,共5页Journal of Aeronautical Materials

基　　金：航空科学基金(04G54009)

摘　　要：采用不同工艺对Mg-2.67%Nd-0.5%Zn-0.5%Zr合金进行了搅拌摩擦加工(FSP)处理,利用Hopkinson压杆对FSP处理前后的合金进行了冲击试验,探讨搅拌摩擦加工对该合金动态应力-应变行为及其应变率效应的影响。结果表明,FSP处理之后合金的显微组织因发生动态再结晶得到显著的细化,平均晶粒尺寸约由60μm减小至不足10μm。在高应变率冲击载荷下,合金母材的动态应力-应变行为表现出了明显的应变率强化效应,而FSP处理之后合金的动态应力-应变行为对应变率不敏感。这主要是由于经不同工艺FSP处理后,Mg-2.67%Nd-0.5%Zn-0.5%Zr合金产生的细晶强化及细小、弥散的沉淀相强化,大大提高了合金的变形抗力。Mg-2.67%Nd-0.5%Zn-0.5%Zr alloy was treated with FSP technology with different parameters. The impact experiments for the alloy and FSP treated alloy were carried out using the Hopkinson Pressure Bar. The effects of FSP on the dynamic stress-strain behavior and its strain rate effects were analyzed. Results show the microstructure of the alloy after FSP treatment is refinement obviously because of dynamic recrystallization generate in the alloy,and the average grain size of this alloy from 60μm reduced to below 10μm. The dynamic stress-strain behavior of Mg-2.67%Nd-0.5%Zn-0.5%Zr alloy shows remarkable rate strengthening effect with strain rate increasing,but which of the alloy after FSP treatment is insensitive to strain rate under high-speed impact loading. This mainly results from obvious increasing of the deformation resistance for the alloy,which is induced because strengthening of grains refinement and small,dispersive precipitates in the alloy after FSP treatment.

关 键 词：Mg-Nd-Zn-Zr合金 搅拌摩擦加工 组织细化 应变率 

分 类 号：TG146[一般工业技术—材料科学与工程]