Dynamic tensile deformation behavior of Zr-based amorphous alloy matrix composites reinforced with tungsten or tantalum fibers

• Published in: Metals and materials international Vol. 22; no. 4; pp. 707 - 713
• Main Authors: Lee, Hyungsoo, Kim, Gyeong Su, Jeon, Changwoo, Sohn, Seok Su, Lee, Sang-Bok, Lee, Sang-Kwan, Kim, Hyoung Seop, Lee, Sunghak
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.07.2016; Springer Nature B.V; 대한금속·재료학회
• Subjects: Aerospace materials; Alloys; Amorphous alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Continuous fiber composites; Crack propagation; Deformation; Deformation mechanisms; Ductile fracture; Ductility; Dynamics; Elastic deformation; Engineering Thermodynamics; Fibers; Fracture mechanics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metal matrix composites; Metallic glasses; Metallic Materials; Necking; Process controls; Processes; Scanning electron microscopy; Solid Mechanics; Strength; Tantalum; Tensile deformation; Tensile properties; Tensile strength; Tensile tests; Tungsten; Zirconium base alloys; 재료공학; composites; dynamic tensile deformation; fibers; split hopkinson tensile bar; amorphous materials
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-016-5472-4

Zr-based amorphous alloy matrix composites reinforced with tungsten (W) or tantalum (Ta) continuous fibers were fabricated by liquid pressing process. Their dynamic tensile properties were investigated in relation with microstructures and deformation mechanisms by using a split Hopkinson tension bar. The dynamic tensile test results indicated that the maximum strength of the W-fiber-reinforced composite (757 MPa) was much lower than the quasi-statically measured strength, whereas the Ta-fiber-reinforced composite showed very high maximum strength (2129 MPa). In the W-fiber-reinforced composite, the fracture abruptly occurred in perpendicular to the tensile direction because W fibers did not play a role in blocking cracks propagated from the amorphous matrix, thereby resulting in abrupt fracture within elastic range and consequent low tensile strength. The very high dynamic tensile strength of the Ta-fiber-reinforced composite could be explained by the presence of ductile Ta fibers in terms of mechanisms such as (1) interrupted propagation of cracks initiated in the amorphous matrix, (2) formation of lots of cracks in the amorphous matrix, and (3) sharing of loads and severe deformation (necking) of Ta fibers in cracked regions.