摘要
采用动力学分析方法(DMA)、电阻法和透射电镜(TEM),分别测量了Mn-Ni合金的内耗、模量与温度的变化关系和Ms,tn点,观察了合金的显微组织,并与Mn-Cu合金进行了对比分析以研究反铁磁转变、马氏体相变之间的耦合机制,以及反铁磁转变和马氏体相变对孪晶形成的作用.分析结果表明:在Mn-Ni合金中,可以由孪晶峰和马氏体相变峰的叠加产生高阻尼;另外,反铁磁转变与马氏体相变能否紧密耦合,除了与“应变释放机制”相关的畸变度有关外,还与Ms以点和tn点之间的差异具有很大的关系.
By dynamic mechanical analyzer (DMA.), resistance method and transmission electron microscope (TEM), the relationships of the internal friction and moduli of Mn-Ni alloys with temperature were measured, M-s and t(n) were confirmed and the microstructure was observed. Compared with Mn-Cu alloy, the coupling mechanism was investigated and the effect of antiferromagnetic transition and martensite transformation on the twin formation was analyzed. The results show that a high damping capacity can be formed through the overlap between the twin peak and martensite transformation peak or the twin formed with antiferromagnetic transition in Mn-Ni alloys; otherwise, the formation of coupling is related not only on distortion degree of strain release but also on the difference between M-s and t(n).
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第11期1153-1156,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目50711041
