Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy

材料科学 高熵合金 极限抗拉强度 旋节分解 合金 打滑(空气动力学) 吕德斯乐队 延展性(地球科学) 固溶强化 位错 旋节 复合材料 相(物质) 蠕动 热力学 化学 有机化学 物理
作者
Xiaodong Han,Shengcheng Mao,Tao Yang,C.T. Liu,Bin Zhang,E. Ma,Hao Zhou,Ze Zhang,Lihua Wang,Xiaodong Han
出处
期刊:Materials horizons [Royal Society of Chemistry]
卷期号:8 (3): 948-955 被引量:104
标识
DOI:10.1039/d0mh01341b
摘要

Body-centered-cubic (BCC) refractory high-entropy alloys (RHEAs) are being actively pursued due to their potential to outperform existing superalloys at elevated temperatures. One bottleneck problem, however, is that these RHEAs lack tensile ductility and, hence, processability at room temperature. The strategy previously invoked to sustain ductility in high-strength HEAs is to manage dislocation movements via incorporating dispersed obstacles; this, however, may also have embrittlement ramifications. Here, a new strategy is demonstrated to achieve ductile BCC HfNbTiV, via decomposing the BCC arrangement (β phase) into a β(BCC1) + β*(BCC2) arrangement via spinodal decomposition, producing chemical composition modulations and, more importantly, elastic strain on a length scale of a few tens of nanometers. The periodically spaced β*, with large lattice distortion, is particularly potent in heightening the ruggedness of the terrain for the passage of dislocations. This makes the motion of dislocations sluggish, causing a traffic jam and cross-slip, facilitating dislocation interactions, multiplication, and accumulation. Wavy dislocations form walls that entangle with slip bands, promoting strain hardening and delocalizing plastic strain. A simultaneous combination of high yield strength (1.1 GPa) and tensile strain to failure (28%) is achieved; these values are among the best reported so far for refractory high-entropy alloys.
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