Microstructure, dislocation density and microhardness of 1 %C-doped CoCrFeNi complex concentrated alloys during isochronal annealing
Microstructure, dislocation density and microhardness of 1 %C-doped CoCrFeNi complex concentrated alloys during isochronal annealing
复制标题
显微组织、%20位错%20密度%20和%20显微硬度%20of%201%20%C掺杂%20CoCrFeNi%20络合物%20浓缩%20合金%20期间%20等时%20退火
DOI：
10.1016/j.jallcom.2022.167504
复制
发表时间：
2023
影响因子：
6.2
通讯作者：
Sato Shigeo
中科院分区：
文献类型：
--
作者：
Thirathipviwat Pramote;Onuki Yusuke;Umemura Kazuki;Sato Shigeo
在这项研究中，适度变形的1%C掺杂的CoCrFeNi复合浓缩合金（CCA）的显微组织进行了研究，在不同的退火温度下，1小时的显微组织演变的相关性。冷轧减薄60%后，位错密度累积高达19 × 1015 m −2。间隙碳原子是诱发大位错储存的关键因素，并产生了368 J/mol的大应变能。再结晶在1173 K下1 h完成，平均再结晶晶粒尺寸为3.7 µm。在973 ~ 1173 K的退火过程中，随着退火温度的升高，碳化物的析出逐渐增多。碳的加入由于溶质拖曳效应和碳化物的析出而推迟了再结晶过程。传统的制备方法由于变形组织中位错密度大和碳化物析出，产生了细小的再结晶组织。
In this study, a microstructure of moderately deformed 1 %C-doped CoCrFeNi complex concentrated alloys (CCA) was investigated in a correlation with microstructure evolution at different annealing temperature for 1 h. After 60 % thickness reduction of cold rolling, the dislocation density accumulated as large as 19 × 1015m−2. The interstitial carbon atom was a key factor inducing large dislocation storage and caused large stored strain energy of 368 J/mol. The recrystallization was completed at 1173 K for 1 h and the average recrystallized grain size was as fine as 3.7 µm. During the annealing between 973 and 1173 K, the carbides were increasingly precipitated with an increase in annealing temperature. The carbon addition delayed the recrystallization process due to solute drag effect and carbide precipitations. The conventional fabrication method produced the fine recrystallized microstructure attributed to the large dislocation density of the deformed microstructure and carbide precipitation.