【摘要】 研究了不同的预变形量对FeMnCr合金阻尼性能的影响,并根据位错运动理论,分析了Shockley不全位错的运动对该合金阻尼性能的影响。研究采用倒扭摆测试合金阻尼性能,OLYMPUS显微镜分析合金的微观组织,XRD分析合金的相组成。结果表明,该合金的阻尼性能随应变振幅的变化规律符合Shockley不全位错脱钉运动模型;随着变形量的增加,Shockley不全位错密度增加,合金阻尼性能得到提高,在4%变形量时达到峰值;随着变形量的继续增大,虽然Shockley不全位错增加,但因全位错的分割作用,使其长度LN减小,造成阻尼性能下降。更多还原

【Abstract】 The effect of pre-deformation on the damping capacity was studied and the effect of the movement of Shockley partial dislocation on the damping capacity of FeMnCr alloy was analyzed by dislocation theory.The damping capacity was measured using reversal torsion pendulum,the microstructure was observed using OLYMPUS microscope.and the phases were determined using XRD.The results indicate that the variation of damping capacity with torsional strain of this alloy is accorded with the breakaway model of Shockley partial dislocation.The Shockley partial dislocation density increases with increasing deformation,thus increases damping capacity,which reaches the peak value at 4% deformation.With the further increase of deformation,the damping capacity decreases due to the decrease of the length of Shockley partial dislocation(LN).更多还原