材料科学
成形性
退火(玻璃)
延展性(地球科学)
冶金
耐火材料(行星科学)
同种类的
高温合金
蠕动
微观结构
热力学
物理
作者
Cheng Zhang,Haoren Wang,Xinyi Wang,Yuanbo T. Tang,Qin Yu,Chaoyi Zhu,Mingjie Xu,Shiteng Zhao,Rui Kou,Xin Wang,Benjamin E. MacDonald,Roger C. Reed,Kenneth S. Vecchio,Penghui Cao,Timothy J. Rupert,Enrique J. Lavernia
出处
期刊:Acta Materialia
[Elsevier]
日期:2023-02-01
卷期号:245: 118602-118602
被引量:21
标识
DOI:10.1016/j.actamat.2022.118602
摘要
Refractory high-entropy alloys (RHEAs) are considered promising candidate materials for high-temperature structural applications that currently use superalloys. However, for most of the reported RHEAs, their poor ductility and negligible cold-workability at room temperature have hindered their use. Here, we report a new class of non-equiatomic NbTaTi-based RHEAs that can be cold-rolled to a reduction of over 90% from the as-cast state without surface treatment and/or intermediate annealing. This excellent cold-workability is facilitated by activation of a high-density of dislocations and deformation twins as well as by high diffusivity paths, such that these RHEAs can be rendered homogeneous at lower annealing temperatures for much shorter time durations. In addition, we report that the RHEAs retain their high strength at elevated temperatures and exhibit considerable ductility at cryogenic conditions, evading the traditional strength–ductility trade-off. This class of super-formable RHEAs provides a novel design pathway to fabricate high-temperature structural materials via an energy- and time-saving method.
科研通智能强力驱动
Strongly Powered by AbleSci AI