Solid solution softening at room temperature and hardening at elevated temperatures: a case by minor Mn addition in a (HfNbTi)85Mo15 refractory high entropy alloy
Artikel i vetenskaplig tidskrift, 2023

To address the conflict between room-temperature (RT) ductility and high-temperature (HT) strength in single phase bcc-structured refractory high entropy alloys, here we propose to use minor alloying to achieve solid solution softening at RT and simultaneously, solid solution hardening at HT. Our strategy was manifested by minor Mn additions in a RT brittle (HfNbTi)85Mo15 refractory high entropy alloy, where nominal Mn additions ranging from 2 at. % down to 0.03 at. % were seen to soften the base (HfNbTi)85Mo15 alloy at RT, while to harden the base alloy at the temperature range from 400 to 800 °C. The yield stress in all studied alloys showed a three-stage pattern, characterized by a temperature dependent stage at temperatures below 400 °C, followed by a temperature independent stage at intermediate temperatures ranging from 400 to 800 °C, and finally another temperature dependent stage at temperatures higher than 800 °C. The mechanisms for solid solution softening and solid solution hardening in single phase bcc-structured refractory high entropy alloys were discussed, together with their temperature dependence.

solid solutions

refractory high entropy alloys

solid solution softening and hardening

Författare

Xiaolong Li

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Mao Ding

Shenzhen University

Q. Hu

Jiangxi Academy of Sciences

Z. Y. Liu

Shenzhen University

H. H. Mao

Thermo-Calc Software AB

Sheng Guo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Materials Research Express

2053-1591 (eISSN)

Vol. 10 11 116501

Ämneskategorier

Metallurgi och metalliska material

DOI

10.1088/2053-1591/ad068c

Mer information

Senast uppdaterat

2023-11-28