Super tensile ductility in an as-cast TiVNbTa refractory high-entropy alloy

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International Pub Date : 2024-10-01 DOI:10.1016/j.pnsc.2024.08.002

Chao Guo , Yuan Xing , Pan Wu , Ruitao Qu , Kexing Song , Feng Liu

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引用次数: 0

Abstract

Refractory high-entropy alloy (RHEA) usually exhibits a high melting point and hence a very high deformation resistance at high temperatures. However, the relatively poor plasticity at room temperature, i.e., only few RHEAs displaying as-cast tensile ductility, strongly limits the applications of RHEAs as engineering materials. In this work, we show a huge tensile ductility observed in an as-cast TiVNbTa RHEA (∼40 % fracture elongation) accompanying with a high yield strength (∼800 MPa), which are rarely reported properties for RHEAs. The as-cast alloy shows a simple body-centered cubic (BCC) structure with dendrites. Ductile fracture with many dimples is the main fracture mechanism, while no twinning and deformation induced phase transition was observed. The uniform plastic deformation mainly relies on the planar and cross-slip of dislocations. The present result suggests the huge ductility potentials for RHEAs, providing a clue for designs future high performance RHEAs with good ductility.

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铸态 TiVNbTa 难熔高熵合金的超强拉伸延展性

难熔高熵合金（RHEA）通常具有很高的熔点，因此在高温下具有很强的抗变形能力。然而，RHEA 在室温下的塑性相对较差，即只有极少数 RHEA 具有铸造拉伸延展性，这严重限制了 RHEA 作为工程材料的应用。在这项工作中，我们展示了在一种铸态 TiVNbTa RHEA 中观察到的巨大拉伸延展性（断裂伸长率 ∼ 40%）以及高屈服强度（∼ 800 兆帕），这些都是很少报道的 RHEA 特性。铸态合金呈现出简单的体心立方（BCC）结构，并伴有树枝状突起。具有许多凹痕的韧性断裂是主要的断裂机制，而没有观察到孪晶和变形诱导的相变。均匀塑性变形主要依赖于位错的平面和交叉滑移。本研究结果表明 RHEAs 具有巨大的延展性潜力，为未来设计具有良好延展性的高性能 RHEAs 提供了线索。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Natural Science: Materials International 综合性期刊-综合性期刊

CiteScore

8.60

自引率

2.10%

发文量

2812

审稿时长

49 days

期刊介绍： Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.