Manipulating the ordered oxygen complexes to achieve high strength and ductility in medium-entropy alloys

被引：59

作者：

Jiao, Meiyuan ^{[1
]}

Lei, Zhifeng ^{[2
]}

Wu, Yuan ^{[1
]}

Du, Jinlong ^{[3
]}

Zhou, Xiao-Ye ^{[4
]}

Li, Wenyue ^{[1
]}

Yuan, Xiaoyuan ^{[1
]}

Liu, Xiaochun ^{[5
]}

Zhu, Xiangyu ^{[6
]}

Wang, Shudao ^{[1
]}

Zhu, Huihui ^{[1
]}

Cao, Peipei ^{[1
]}

Liu, Xiongjun ^{[1
]}

Zhang, Xiaobin ^{[1
]}

Wang, Hui ^{[1
]}

Jiang, Suihe ^{[1
]}

Lu, Zhaoping ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China

[3] Peking Univ, Sch Phys, Electron Microscopy Lab, Beijing 100871, Peoples R China

[4] Shenzhen Univ, Sch Civil Engn, Guangdong Prov Key Lab Durabil Marine Civil Engn, Shenzhen 518060, Peoples R China

[5] Changsha Univ Sci & Technol, Inst Met, Coll Mat Sci & Engn, Changsha 410114, Peoples R China

[6] Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 USA

来源：

NATURE COMMUNICATIONS | 2023年 / 14卷 / 01期

基金：

中国国家自然科学基金;

关键词：

MECHANICAL-PROPERTIES; INTERSTITIAL SOLUTES; MICROSTRUCTURE; TI; NITROGEN; ORIGIN;

D O I：

10.1038/s41467-023-36319-0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Oxygen solute strengthening is an effective strategy to harden alloys, yet, it often deteriorates the ductility. Ordered oxygen complexes (OOCs), a state between random interstitials and oxides, can simultaneously enhance strength and ductility in high-entropy alloys. However, whether this particular strengthening mechanism holds in other alloys and how these OOCs are tailored remain unclear. Herein, we demonstrate that OOCs can be obtained in bcc (body-centered-cubic) Ti-Zr-Nb medium-entropy alloys via adjusting the content of Nb and oxygen. Decreasing the phase stability enhances the degree of (Ti, Zr)-rich chemical short-range orderings, and then favors formation of OOCs after doping oxygen. Moreover, the number density of OOCs increases with oxygen contents in a given alloy, but adding excessive oxygen (>3.0 at.%) causes grain boundary segregation. Consequently, the tensile yield strength is enhanced by similar to 75% and ductility is substantially improved by similar to 164% with addition of 3.0 at.% O in the Ti-30Zr-14Nb MEA.

引用

页数：11

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