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Acta Metall Sin  2007, Vol. 43 Issue (8): 807-812     DOI:
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Effect of deep-cooling and measurement temperature on damping capacity of Fe-Mn alloy
Shu-Ke Huang;LI Ning;;;
四川大学制造科学与工程学院
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Shu-Ke Huang; LI Ning. Effect of deep-cooling and measurement temperature on damping capacity of Fe-Mn alloy. Acta Metall Sin, 2007, 43(8): 807-812 .

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Abstract  In order to disclosure the high damping mechanism of Fe-Mn alloy, the effect of deep-cooling and measurement temperature on damping capacity was studied, by measuring stacking fault probability and using G-L dislocation model. The damping capacity was measured using reversal torsion pendulum. The stacking fault probability and volume fraction of ε-martensite were determined using XRD. The microstructure was observed using SEM. The results indicated that the high damping mechanism was determined by the movement of Shockley partial dislocation, and not by ε-martensite. Because Deep-cooling increased the stacking fault probability in γ-austenite and ε-martensite, the number of Shockley partial dislocations also increased and the damping capacity of Fe-Mn alloy was improved. Higher temperature could decrease the unpinning stress between Shockley partial dislocation and weak pinning points. At a certain strain amplitude, therefore, with the temperature increased, the number of unpinning Shockley partial dislocations was more and the damping capacity of Fe-Mn alloy was improved.
Key words:  damping alloy      Fe-Mn      Shockley partial dislocation      stacking fault probability      deep-cooling      
Received:  04 December 2006     
ZTFLH:  TG135.7  

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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2007/V43/I8/807

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