江峰
- 教授
- 博士生导师
- 硕士生导师
- 性别：男
- 学历：博士研究生毕业
- 学位：博士
- 所在单位：材料科学与工程学院
- 电子邮箱：
- 办公地点：
- 联系方式：
- 学科：材料科学与工程
- 学科：材料科学与工程
博士生齐永良关于高熵合金添加B元素强韧化的论文被JMST 录用！
- 发布时间：2020-09-10
- 文章标题：博士生齐永良关于高熵合金添加B元素强韧化的论文被JMST 录用！
- 内容：Journal of Materials Science & Technology
Enhancement of strength-ductility balance of heavy Ti and
Al alloyed FeCoNiCr high-entropy alloys via boron dopingYongliang Qi 1 , Tinghui Cao 1 , Hongxiang Zong 1, *, Yake Wu 1 , Lin He 1 , Xiangdong Ding 1 , FengJiang 1, *, Shenbao Jin 2 , Gang Sha 2 , Jun Sun 11 State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an,Shanxi 710049, China2 School of Materials Science and Engineering, Nanjing University of Science and Technology,Jiangsu, 210094, China*Corresponding author: zonghust@mail.xjtu.edu.cn (Hongxiang Zong)jiangfeng@ mail.xjtu.edu.cn (Feng jiang)AbstractAs one of the most effective mechanisms, precipitation-hardening is widely used tostrengthen high-entropy alloys. Yet, heavy precipitation-hardened high-entropy alloysusually exhibit serious embrittlement. How to effectively achieve ultra-high strengthand maintain reliable ductility remains a challenge. Here, we report a study of dopingextremely little boron to meet this target. We found that adding of 30 ppm boron intothe heavy Ti and Al alloyed FCC FeCoNiCr high-entropy, (FeCoNiCr) 88 Ti 6 Al 6 HEA(at.%) which is strengthened mainly by both coarse BCC-based (Ni, Co) 2 TiAl Heuslerand fine L1 2 -type FCC-based (Ni, Co) 3 TiAl precipitates and shows ultrahigh strengthbut poor ductility, could significantly change the original microstructure andconsequently improve mechanical performance, owing to the well-known effect ofboron on reducing the energy of grain boundaries . The boron addition can (1) eliminatemicrocavities formed at Heusler precipitate-matrix interfaces; (2) suppress theformation and segregation of coarse BCC Heusler precipitates; (3) promote theformation of L1 2 nanoparticles. This changes of microstructure substantially improvethe tensile ductility more than by ~86% and retain comparable or even better ultimatetensile strength. These findings may provide a simple and costless solution to produceheavy precipitation-strengthened HEAs with ultrahigh strength and prevent accidentalbrittleness.Keywords: High-entropy alloy; Precipitation strengthening; Boron; Ductility