Effects of copper precipitates on microdefects in deformed Fe–1.5 wt%Cu alloy
Effects of copper precipitates on microdefects in deformed Fe–1.5 wt%Cu alloy
复制标题
DOI：
10.1002/pssa.201228849
复制
发表时间：
2013-09
期刊：
影响因子：
--
通讯作者：
Haibiao Wu;Xingzhong Cao;G. Cheng;Jianping Wu;Jing Yang;Peng Zhang;Zhuoxin Li;Abu Zayed Mohammad Saliqur R
中科院分区：
文献类型：
--
作者：
Haibiao Wu;Xingzhong Cao;G. Cheng;Jianping Wu;Jing Yang;Peng Zhang;Zhuoxin Li;Abu Zayed Mohammad Saliqur R
对退火态Fe-1.5wt%Cu合金进行了冷轧变形。用正电子湮没寿命谱(PALS)和多普勒展宽谱(DBS)分析了变形引起的微缺陷。在1173K退火后，合金中均匀地形成了铜的析出物。为了研究铜的析出物对缺陷的形成和迁移的影响，制备了退火良好的纯铁样品作为参照。PALS结果表明，变形过程中合金的正电子寿命(长寿命τ2和平均寿命τm)均小于纯铁。这表明，铜的析出抑制了空位团簇的生长。DBS分析结果表明，纯铁中的S参数大于合金中的S参数，要使S参数在合金中饱和需要较大的变形量。
As‐annealed Fe–1.5 wt%Cu alloys were deformed by cold rolling. Positron annihilation lifetime spectroscopy (PALS) and Doppler broadening spectra (DBS) were used to analyze the microdefects in the alloy induced by deformation. Cu precipitates were formed uniformly in the alloy after annealing at 1173 K. To investigate the effects of Cu precipitates on the formation and migration of defects, well‐annealed pure Fe samples were prepared as a reference. PALS results show that the value of positron lifetime (both long lifetime τ2 and mean lifetime τm) in the alloy is smaller than in pure Fe during deformation. This indicates that Cu precipitates restrain the growth of vacancy clusters. Results of DBS show that the S parameter in pure Fe is larger than in the alloy, and more deformation is needed for the S parameter to be saturated in the alloy.