Short-range ordering alters the dislocation nucleation and propagation in refractory high-entropy alloys

成核 材料科学 晶界 位错 微观结构 GSM演进的增强数据速率 化学物理 凝聚态物理 热力学 物理 复合材料 化学 电信 计算机科学
作者
Shuai Chen,Zachary H. Aitken,Subrahmanyam Pattamatta,Zhaoxuan Wu,Zhi Gen Yu,David J. Srolovitz,Peter K. Liaw,Yong‐Wei Zhang
出处
期刊:Materials Today [Elsevier BV]
卷期号:65: 14-25 被引量:38
标识
DOI:10.1016/j.mattod.2023.03.009
摘要

The role of short-range ordering (SRO) in the dislocation kinetics in refractory high-entropy alloys (RHEAs) remains controversial. On one hand, it was shown by simulations that the mobility of edge dislocations was enhanced while that of screw dislocations was reduced, leading to the conclusion that screw dislocations should be dominant. On the other hand, experiments exclusively showed the dominance of edge dislocations. Here, we investigate the impact of SRO in the grain interior and grain boundary on dislocation nucleation and propagation in a BCC MoTaTiWZr RHEA, using a combination of the density-functional theory calculations, Monte Carlo method, and molecular dynamic simulation. Our results show that this RHEA is energetically favorable to undergo SRO, thus forming a pseudo-composite microstructure. This microstructure consists of three categories of clusters: high energy clusters (HECs), medium energy clusters (MECs), and low energy clusters (LECs), with the HECs in grain boundaries acting as weak fillers to induce dislocation nucleation while the MECs/LECs serving as a strong matrix to stabilize the weak HECs. Importantly, SRO is found to enhance the energy barriers for both edge and screw dislocation motion and make the mobility of edge dislocations comparable to or even lower than screw dislocations, contributing to the dominance of edge dislocations in the BCC RHEA. Our work highlights the importance of SRO in influencing the dislocation activity of RHEAs and presents a fascinating route for designing RHEAs to achieve superior mechanical properties.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
Liziuan发布了新的文献求助10
刚刚
yuer发布了新的文献求助10
刚刚
量子星尘发布了新的文献求助10
1秒前
整齐半仙完成签到,获得积分10
1秒前
1351567822应助墨菲特采纳,获得10
1秒前
2秒前
joshar完成签到,获得积分10
2秒前
2秒前
传奇3应助科研通管家采纳,获得10
2秒前
共享精神应助科研通管家采纳,获得10
2秒前
ll应助科研通管家采纳,获得10
2秒前
无花果应助kouzhenhao采纳,获得10
2秒前
2秒前
丘比特应助科研通管家采纳,获得10
2秒前
2秒前
3秒前
3秒前
3秒前
深情的保温杯完成签到,获得积分10
3秒前
3秒前
reirei应助水门采纳,获得30
3秒前
科研小白发布了新的文献求助10
3秒前
3秒前
阔达的凡儿完成签到,获得积分10
4秒前
芝麻配海带完成签到,获得积分10
4秒前
4秒前
韩XR完成签到,获得积分20
4秒前
博修发布了新的文献求助10
6秒前
dear_xiaokuan完成签到,获得积分10
6秒前
7秒前
7秒前
思源应助Lion采纳,获得10
7秒前
7秒前
小木木发布了新的文献求助10
8秒前
初柒发布了新的文献求助10
8秒前
8秒前
aaa发布了新的文献求助10
9秒前
10秒前
10秒前
hys发布了新的文献求助10
10秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3970157
求助须知:如何正确求助?哪些是违规求助? 3514887
关于积分的说明 11176340
捐赠科研通 3250158
什么是DOI,文献DOI怎么找? 1795198
邀请新用户注册赠送积分活动 875668
科研通“疑难数据库(出版商)”最低求助积分说明 805004