Penetration Fracture Mechanism of Tungsten-Fiber-Reinforced Zr-Based Bulk Metallic Glasses Matrix Composite under High-Velocity Impact

• Published in: Materials Vol. 16; no. 1; p. 40
• Main Authors: Du, Chengxin, Zhou, Feng, Gao, Guangfa, Du, Zhonghua, Fu, Huameng, Zhu, Zhengwang, Cheng, Chun
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 21.12.2022; MDPI
• Subjects: Amorphous materials; Bending; bending and backflow; Deformation; Experiments; Fracture mechanics; Glass matrix composites; High strength steels; Hot-rolled steel; Impact velocity; Internal fixation in fractures; Metallic glasses; Military technology; Morphology; Non Newtonian flow; Penetration; penetration fracture mode; Rods; Shear localization; Tungsten; Tungsten alloys; Tungsten base alloys; tungsten-fiber-reinforced Zr-based bulk metallic glass matrix composite (WF/Zr-MG); Velocity; bending and backflow; impact velocity; penetration fracture mode; tungsten-fiber-reinforced Zr-based bulk metallic glass matrix composite (WF/Zr-MG)
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16010040

In order to adapt to the launch velocity of modern artillery, it is necessary to study the fracture mechanism of the high-velocity penetration of penetrators. Therefore, the penetration fracture mode of tungsten-fiber-reinforced Zr-based bulk metallic glass matrix composite (WF/Zr-MG) rods at a high velocity is studied. An experiment on WF/Zr-MG rods penetrating into rolled homogeneous armor steel (RHA) was carried out at 1470~1650 m/s. The experimental results show that the higher penetration ability of WF/Zr-MG rods not only results from their "self-sharpening" feature, but also due to the fact they have a longer quasi-steady penetration phase than tungsten alloy (WHA) rods. Above 1500 m/s, the penetration fracture mode of the WF/Zr-MG rod is the bending and backflow of tungsten fibers. Our theoretical calculation shows that the deformation mode of the Zr-based bulk metallic glass matrix (Zr-MG) is an important factor affecting the penetration fracture mode of the WF/Zr-MG rod. When the impact velocity increases from 1000 m/s to 1500 m/s, the deformation mode of Zr-MG changes from shear localization to non-Newtonian flow, leading to a change in the penetration fracture mode of the WF/Zr-MG rod from shear fracture to the bending and backflow of tungsten fibers.