功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2014年
10期
10102-10104,10108
,共4页
金莹%晁月盛%张艳华%王莉
金瑩%晁月盛%張豔華%王莉
금형%조월성%장염화%왕리
Fe52Co34Hf7B6Cu1非晶合金%中频磁脉冲%正电子湮没寿命%结构缺陷
Fe52Co34Hf7B6Cu1非晶閤金%中頻磁脈遲%正電子湮沒壽命%結構缺陷
Fe52Co34Hf7B6Cu1비정합금%중빈자맥충%정전자인몰수명%결구결함
Fe52 Co34 Hf7 B6 Cu1 amorphous alloy%medium-frequency magnetic pulse%positron annihilation lifetime%structural defects
对 Fe52 Co34 Hf7 B6 Cu1非晶试样进行了中频磁脉冲处理,脉冲磁场频率、作用时间保持恒定:1500 Hz、10 min,脉冲磁场强度分别为15.92,19.9和23.88 kA/m。用穆斯堡尔谱(MS)和正电子湮没寿命谱(PAS)方法研究了该试样在中频磁脉冲处理前后的结构及结构缺陷变化。结果表明,在非晶合金的制备态,正电子主要在自由体积中湮没,经中频磁脉冲处理后,非晶合金发生不可逆的结构弛豫,导致湮没寿命τ1下降。随着脉冲磁场强度的增加,非晶合金发生晶化,产生新的正电子俘获中心,导致强度I2急剧增加, I1急剧降低。
對 Fe52 Co34 Hf7 B6 Cu1非晶試樣進行瞭中頻磁脈遲處理,脈遲磁場頻率、作用時間保持恆定:1500 Hz、10 min,脈遲磁場彊度分彆為15.92,19.9和23.88 kA/m。用穆斯堡爾譜(MS)和正電子湮沒壽命譜(PAS)方法研究瞭該試樣在中頻磁脈遲處理前後的結構及結構缺陷變化。結果錶明,在非晶閤金的製備態,正電子主要在自由體積中湮沒,經中頻磁脈遲處理後,非晶閤金髮生不可逆的結構弛豫,導緻湮沒壽命τ1下降。隨著脈遲磁場彊度的增加,非晶閤金髮生晶化,產生新的正電子俘穫中心,導緻彊度I2急劇增加, I1急劇降低。
대 Fe52 Co34 Hf7 B6 Cu1비정시양진행료중빈자맥충처리,맥충자장빈솔、작용시간보지항정:1500 Hz、10 min,맥충자장강도분별위15.92,19.9화23.88 kA/m。용목사보이보(MS)화정전자인몰수명보(PAS)방법연구료해시양재중빈자맥충처리전후적결구급결구결함변화。결과표명,재비정합금적제비태,정전자주요재자유체적중인몰,경중빈자맥충처리후,비정합금발생불가역적결구이예,도치인몰수명τ1하강。수착맥충자장강도적증가,비정합금발생정화,산생신적정전자부획중심,도치강도I2급극증가, I1급극강저。
The amorphous alloy specimens Fe52 Co34 Hf7 B6 Cu1 were treated by medium-frequency magnetic pulse. The treatment conditions were as follows:the pulsing magnetic field frequency and the acting time were kept at 1 500 Hz,10 min,and the field intensity were 15.92,19.9 and 23.88 kA/m respectively.The structural and structural defects of specimens before and after magnetic-pulsing were researched by M?ssbauer spectroscopy (MS)and positron annihilation lifetime spectra (PAS).The results show that in the as-quenched amorphous al-loy,the positron are mainly localized at vacancy-sized free volumes in the amorphous based phase,and the amorphous alloy produced irreversible structural relaxation after being treated by the medium-frequency mag-netic pulse which leaded to the decline of the annihilation lifetimeτ1 .With the increase of pulsing magnetic field intensity,new trapping centers of positrons are produced owing to the crystallization of amorphous phase,that leads to the intensity I 2 increases and I 1 decreases drastically.