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邓翠贞,彭文屹,陈琳,孙玉龙.热循环对82.2Mn-15.8Cu-2Al热敏阻尼材料的内耗性能影响研究[J].稀有金属材料与工程(英文),2017,46(12):3773~3778.[DENG Cui-Zhen,PENG Wenyi,CHEN Lin and SUN Yulong.Study on the effect of thermal cycling on the properties of Mn82.2-Cu15.8-2Al thermally sensitive damping material[J].Rare Metal Materials and Engineering,2017,46(12):3773~3778.]
Study on the effect of thermal cycling on the properties of Mn82.2-Cu15.8-2Al thermally sensitive damping material
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Received:October 09, 2016  Revised:January 29, 2017
DOI:
Key words: internal friction  82.2Mn-15.8Cu-2Al(at%) alloy  thermal cycle
Foundation item:国家自然科学基金资助(项目号51461030);江西省自然科学基金(项目号20151BAB206006)
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DENG Cui-Zhen,PENG Wenyi,CHEN Lin and SUN Yulong  
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Abstract:
      :The change rule of friction and thermal properties of the alloy after thermal cycling was study by internal friction method combined with DSC, SEM and XRD. The change rule is that the alloys internal friction and DSC peak shift to high temperature when experiencing an increasing number of thermal cycles.The results show that this variation is attributed to the occurrence of Spinodal decomposition of the alloy, which formed Mn rich and Cu rich areas.We combine the mechanism of microstructure analyzed the internal friction peak .We calculated the activation energy(Ea) and the pre-exponential factor of relaxation (t0) of the low temperature side internal friction peak. Ea=0.66 eV(heating), Ea=0.74 eV(cooling),t0=1.4×10-15s(heating),t0=3.2×10-18s(cooling). Using the peak separation method to isolate the internal friction peak,which is caused bySmutual coupling of martensitic transformation and antiferromagnetic transition. According to the fitting results, the experimental phenomena can be explained reasonably.