单辊旋淬法制备含Ti的Fe基形状记忆合金的组织与性能  

Microstructure and shape memory property of Ti containning iron-based shape memory alloys prepared with melt spinning

作　　者：陈伟[1,2] 包蕴斌 陈川辉[1,2] 柏杨[1,2] 叶旭初[1,2] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]南京工业大学材料化学工程国家重点实验室,南京210009

出　　处：《功能材料》2015年第3期3127-3130,3134,共5页Journal of Functional Materials

基　　金：长江学者和创新团队发展计划资助项目(IRT1146)

摘　　要：采用单辊旋淬法制备了3种不同组成的Fe基形状记忆合金(shape memory alloy,SMA):Fe-30Mn-6Si、Fe-30Mn-6Si-1Ni、Fe-30Mn-6Si-1Ni-1Ti。采用X射线衍射仪(XRD)、金相显微镜(OM)、扫描电子显微镜(SEM)分析了合金的成分及结构,通过拉伸实验测量合金的形状恢复率。结果表明,在Fe-30Mn-6Si合金中,除奥氏体晶粒外出现少量枝晶偏析,其二次枝晶臂间距为0.2μm。Fe-30Mn-6Si-1Ni、Fe-30Mn-6Si-1Ni-1Ti中等轴奥氏体晶粒均匀分布,且后者晶粒较大。预变形量为1%,1.5%时,Fe-30Mn-6Si-1Ni的形状恢复率高于Fe-30Mn-6Si-1Ni-1Ti;预变形量为2%时,Fe-30Mn-6Si-1Ni-1Ti的形状恢复率高于Fe-30Mn-6Si-1Ni;预变形量为3%时,Fe-30Mn-6Si-1Ni-1Ti的形状恢复率出现最大值2%。Three kinds of SMAs with different composition Fe-30Mn-6Si,Fe-30Mn-6Si-1Ni,and Fe-30Mn-6Si-1 Ni-1 Ti were prepared with melt spinning.The microstructure of these alloys were analysed with X-ray diffrac-tion (XRD),optical microscope (OM)and scanning-electron microscope (SEM),the shape recovery strain of the alloys were measured by tensile test.Dendrite spikes appears in Fe-30Mn-6Si,the dendrite arm spacing was about 0.2μm.Equiaxial austenite grains distributed uniformly in Fe-30Mn-6Si-1Ni and Fe-30Mn-6Si-1Ni-1Ti, the grain size in Fe-30Mn-6Si-1Ni-1Ti was bigger.When the pre-strain was 1% and 1.5%,the shape recovery strain of Fe-30Mn-6Si-1Ni was higher than Fe-30Mn-6Si-1Ni-1Ti.When the pre-strain was 2%,the shape re-covery strain of Fe-30Mn-6Si-1Ni-1Ti is higher than Fe-30Mn-6Si-1Ni.The Fe-30Mn-6Si-1Ni-1Ti shows the highest shape recovery strain 2% when then pre-strain was 3%.

关 键 词：形状记忆合金 FE-MN-SI 单辊旋淬 

分 类 号：TG139.6[一般工业技术—材料科学与工程]