Significant room-temperature plasticity in a high Zr-containing bulk glassy alloy

• Published in: Journal of materials research 2020-06, Vol.35 (12), p.1590-1597
• Main Authors: Chen, Shuangshuang, Song, Peidi, Xing, Dong, Zou, Jiahua, Deng, Xida, Liu, Feng
• Format: Article
• Language: English
• Subjects: Alloy development; Alloys; Amorphous alloys; Applied and Technical Physics; Biomaterials; Cooling; Cooling rate; Corrosion resistance; Crystallization; Die casting; Fracture strength; Fragility; Glass; Glass formation; Inhomogeneity; Injection molding; Inorganic Chemistry; Materials Engineering; Materials research; Materials Science; Mechanical properties; Modulus of elasticity; Nanotechnology; Novel Synthesis and Processing of Metals; Organic and Hybrid Functional Materials; Plastic deformation; Room temperature; Temperature; Thermal stability; Transplants & implants; Viscosity; Zirconium
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/jmr.2020.94

In this study, the glass forming ability, thermal stability, and room-temperature mechanical behavior of a high Zr-containing Zr71Cu11Ni10.5Al7Ti0.5 bulk glassy alloy were investigated. The glassy alloy exhibits a high glass-forming ability with a critical casting diameter of 5 mm using copper mold injection casting, and its critical cooling rate is estimated to be smaller than 40 K/s. A small kinetic fragility index m of 32 indicates its good thermodynamic stability and glass-forming ability. Compressive tests indicate that the glassy alloy displays a significant average plastic strain of 12.3%, a high fracture strength of 1592 MPa, and Young's modulus of 74.5 GPa. The good ductility is attributed to the introduction of more free volume and local compositional inhomogeneity with increasing Zr addition. This finding may provide useful guidelines for the development of novel high Zr-containing glassy alloys.