摘要
本文通过对室温时效二年的Cu-14Al-4Ni形状记忆合金进行电子显微研究,发现形状记忆合金中的马氏体在室温产生缓慢的亚结构变化,出现定向有序畴和晶界过渡区,孪晶界被破坏。矩形网格状有序畴产生并长大。首次观察到周期性反相结构与反相畴呈现在同一操作矢量下。用电子衍衬和能谱作原位观察,发现晶界出现溶质原子偏聚和位错缠结,晶内有序区出现周期性层错。基体、有序区和晶界的溶质原子Al的浓度呈现递增形式,其中基体贫Al,晶界富Al。
The substructure change of martensite in shape memory alloy Cu-14Al-4Ni agedat room temperature for 2 years has been observed. The domains of highly ordered phase andthe transition regions at grain boundaries appear, the twin boundaries damage. Furthermore,the microstructure also gives the appearance and growth of antiphase domains like rectangularnetwork. The long period antiphase structures and the antiphase domains have been cbserved atthe single diffracted vector g. The concentration gradient of Al has been found from the ma-trix to the grain boundaries, the matrix is poor in Al and the grain boundaries are rich in Al.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第4期A307-A309,共3页
Acta Metallurgica Sinica
关键词
时效
形状记忆合金
马氏体
shape memory alloy
martensite
Cu-14Al-4Ni
aging
