Fe含量对纳米晶Ni-Fe合金变形机制的影响  

The Effect of Fe Content on the Deformation Mechanism of Nanocrystalline Ni-Fe Alloy

作　　者：孙世成[1,2] 穆君伟 高逸涵[3] 江忠浩[2] 

机构地区：[1]长春工业大学先进结构材料省部共建教育部重点实验室,吉林长春130012 [2]吉林大学汽车材料教育部重点实验室,吉林长春130025 [3]国家安全生产监督管理总局研究中心,北京100713

出　　处：《稀有金属材料与工程》2013年第S2期388-392,共5页Rare Metal Materials and Engineering

基　　金：长春工业大学校内基金(2010XN04)

摘　　要：采用电沉积方法制备出了一组平均晶粒尺寸约为20 nm的具有不同Fe含量的纳米晶Ni-Fe合金,以研究Fe含量对材料硬度性能的影响。使用纳米硬度仪对纳米晶Ni-Fe合金进行速率范围为10-3～10-1 s-1的硬度测试。随着Fe含量的增加,材料的硬度逐渐降低,直至Fe含量达到50%,随后硬度值反而升高。硬度值的变化是由于当Fe含量在50%以下时,纳米晶Ni-Fe合金由晶界机制主导变形,硬度随Fe含量的增加逐渐降低。而当Fe含量大于50%后,位错机制主导变形导致材料产生应变硬化,硬度随Fe含量的增加而升高。To research the effect of Fe content on the hardness,nanocrystalline Ni-Fe alloys were prepared by electrodeposition technology with different Fe contents and average grain size of 20 nm.The hardness of nanocrystalline Ni-Fe alloys was tested by Nano Indenter with the strain rates of 10-3～10-1 s-1.With increasing of Fe content,the hardness of Ni-Fe alloy is decreased until the Fe content to be 50%,and then the hardness is increased.The results show that deformation is grain boundary-base mechanism.When the Fe content is below 50%,the increase of Fe content will lead to the hardness decrease.When the Fe content is beyond 50%,the deformation is dominant by dislocation-base mechanism,the increase of Fe content will lead to strain hardening and this increases the hardness.

关 键 词：Fe含量 纳米晶Ni-Fe合金 变形机制 纳米硬度 

分 类 号：TG146.15[一般工业技术—材料科学与工程]