CAJ | 학술논문

为了研究外场对钛板位错运动的影响,对冷轧纯态板试样进行高密度脉冲电流处理(最大电流密度7.22、7.64、7.96 kA/mm2,周期110 μs).应用动态机械分析仪(DMA)测量不同试样的内耗和弹性模量.结果表明:在变形的最初阶段,脉冲电流处理试样的内耗值低于冷轧试样的；但当应变幅值超过一定值后,脉冲电流处理试样的内耗值高于普通退火试样和冷轧试样的；并且在整个变形阶段,普通退火试样的内耗值总是低于冷轧试样和脉冲电流处理试样的.阻尼温度谱的研究结果表明:与普通退火试样相比,脉冲电流处理试样的阻尼峰值移向了低温区.试验结果证明了脉冲电流处理能够降低位错的缠结,提高位错的可动性.
위료연구외장대태판위착운동적영향,대랭알순태판시양진행고밀도맥충전류처리(최대전류밀도7.22、7.64、7.96 kA/mm2,주기110 μs).응용동태궤계분석의(DMA)측량불동시양적내모화탄성모량.결과표명:재변형적최초계단,맥충전류처리시양적내모치저우랭알시양적；단당응변폭치초과일정치후,맥충전류처리시양적내모치고우보통퇴화시양화랭알시양적；병차재정개변형계단,보통퇴화시양적내모치총시저우랭알시양화맥충전류처리시양적.조니온도보적연구결과표명:여보통퇴화시양상비,맥충전류처리시양적조니봉치이향료저온구.시험결과증명료맥충전류처리능구강저위착적전결,제고위착적가동성.
To investigate the effect of the electropulsing on dislocation mobility,specimens cut from the cold-rolled titaniun sheet were treated by high density electropulsing with the maximum current density of 7.22,7.64,7.96 kA/mm2,pulse period 110 μs.The intemal friction and elastic modulus were measured by a dynamic mechanical analyzer (DMA).When strain amplitude lowers a certain critical one,the damping of the electropulsed titanium sheet is lower than that of the cold-rolled one.When the strain amplitude exceeds the critical one,the damping of the electropulsed titanium sheet is extraordinarily higher than that of the cold-rolled or conventional annealed one.Furthermore,it is found that the damping peak of the electropulsed titanium sheet shifts to lower temperature compared with the conventional annealed one.It is demonstrated that the electropulsing treatment can decrease dislocation tangles and enhance dislocation mobility.