Open AccessEnhanced strength and corrosion resistance in as-cast TA10 alloys via interstitial carbon solute
Author(s) -
Yong Yang,
Binbin Wang,
Yanjie Li,
Baoxian Su,
Liangshun Luo,
Liang Wang,
Haiguang Huang,
Yanqing Su,
Jingjie Guo
Publication year - 2022
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ac639d
Subject(s) - materials science , microstructure , corrosion , grain boundary , passivation , intergranular corrosion , lamellar structure , metallurgy , phase (matter) , composite material , layer (electronics) , chemistry , organic chemistry
The addition of interstitial elements generally has a significant impact on the macroscopic performances of structural alloys. Here, we report a systematic study on the microstructure, corrosion behaviors and mechanical properties of a series of as-cast Ti-0.3Mo-0.8Ni- x C ( x = 0.09, 0.12 and 0.15 wt.%) alloys. A typical basket-weave microstructure appears in all specimens, characterized by the lamellar α -phase and intergranular retained β -phase without TiC precipitates within the prior β grain boundary. Based on the electrochemical and immersion tests, doping with C element can significantly improve the corrosion resistance of TA10 alloys; with increasing the carbon content, the passivation current density decreases from 5.750 to 4.938 μ A·cm −2 , the breakdown potential increases from −1.115 to −1.223 V versus SCE, the corrosion rate reduces from 15 mm/a to 7.5 mm/a. Moreover, the mechanical properties of TA10 alloys, such as the strength and hardness, can also be enhanced via C alloying. Our results indicate that the addition of interstitial elements should be a potential effective mean to accommodate the comprehensive performances of TA10 alloys.