Abstract
NiCoCr-based multi-component alloys have drawn much attention due to their exceptional ductility and strain hardening capacity.However,insufficient strength-ductility synergy of NiCoCr alloy has always been an issue that prevents it from extensive applications.According to our previous research,the precipitation of γ"phase can significantly improve the strength-ductility synergy of this alloy system at room temperature.In this study,the effects of V addition on γ"phase stability and high-temperature mechanical properties have been explicitly investigated.The results indicate that V addition can sta-bilize the metastable γ"phase in this alloy system and prevent it from transforming into a stable δphase at grain boundaries upon 650℃aging,resulting in improved mechanical properties at elevated temperatures.The specific strength of γ"-strengthened multi-component NiCoCr-based alloy can reach up to 86.2 MPa g-1 cm-3 at 650℃,which is higher than those of Ni-based superalloys,IN 939 and Waspaloy.This work provides theoretical guidance for the novel design of γ"-strengthened alloy for high-temperature applications.
基金项目
National Science and Technology Major Project of China(J2019-VI-0004-0117)
National Science and Technology Major Project of China(2017-VI0013-0085)
国家自然科学基金(52071205)
国家自然科学基金(52001205)
国家自然科学基金(51771118)
NETL
NSTL
万方数据