Fe-Mn合金阻尼机制的研究  

Study on the Damping Mechanism of Fe-Mn Alloy

作　　者：黄姝珂[1] 李宁[1] 文玉华[1] 焦玉琴[1] 丁胜[1] 滕劲[1] 

机构地区：[1]四川大学,四川成都610065

出　　处：《稀有金属材料与工程》2007年第A03期683-687,共5页Rare Metal Materials and Engineering

基　　金：新世纪优秀人才支持计划(NCET-06-0793);上海交通大学机械系统与振动国家重点实验室开放基金(VSN-2007-04)

摘　　要：根据位错运动理论,分析了Fe-Mn合金中Shockley不全位错的运动方式以及产生阻尼的机制,并依据这种模型讨论了水冷和深冷2种热处理工艺对合金阻尼性能的影响。利用倒扭摆测试合金的阻尼性能,采用SEM观察合金的微观组织,通过XRD测定合金的相组成以及层错几率。结果表明,Fe-Mn合金阻尼性能随应变振幅的变化数据符合Shockley不全位错脱钉内耗模型;合金经深冷处理后层错几率增加,即Shogkley不全位错数量增加,所以其阻尼性能得到提高。The movement of Shockley partial dislocation and damping mechanism of Fe-Mn alloy were studied on the basis of dislocation theory. Using this model, the effect of heat treatment on the damping capacity was analyzed too. The damping capacity was measured using reversal torsion pendulum. SEM observed the microstructure. The phase structures and stacking fault probability were determined by XRD. The results indicated that the variation of damping capacity with torsional strain amplitude of Fe-Mn alloy met the breakaway model of Shockley partial dislocation. The stacking fault probability and the number of Shockley partial dislocations increased after deep-cooling, so its damping capacity was improved.

关 键 词：阻尼合金 阻尼机制 Fe—Mn Shockley不全位错 层错几率 

分 类 号：TG115[金属学及工艺—物理冶金]