1. "Self-sharpening" tungsten high-entropy alloy.
- Author
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Liu, Xing-Fa, Tian, Zhi-Li, Zhang, Xian-Feng, Chen, Hai-Hua, Liu, Tian-Wei, Chen, Yan, Wang, Yun-Jiang, and Dai, Lan-Hong
- Subjects
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TUNGSTEN alloys , *ALLOYS , *DENDRITIC crystals , *MICROSTRUCTURE - Abstract
"Self-sharpening", a material maintaining its acute head shape during penetration, is highly desirable in a wide range of engineering applications. However, it remains a great challenge to make it occur in conventional single-principal-element alloys. Here, we develop a new chemical-disordered multi-phase tungsten high-entropy alloy that exhibits outstanding self-sharpening capability, in sharp contrast to conventional tungsten alloys only showing mushrooming. This alloy consists of a BCC dendrite phase and a rhombohedral μ phase embedded in the continuous FCC matrix, and such a unique microstructure leads to a 10–20% better penetration performance than conventional tungsten heavy alloys. We show that emergence of the self-sharpening is triggered by the ultrastrong μ phase stimulated dynamic recrystallization softening mediated shear banding. This study sheds light on the origin of self-sharpening and might open new opportunities for developing high-performance penetrator materials. Image, graphical abstract [ABSTRACT FROM AUTHOR]
- Published
- 2020
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