Tune the mechanical properties of Ti-based metallic glass composites by additions of nitrogen

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 694; pp. 93 - 97
• Main Authors: Li, Liyuan, Li, Jinshan, Wang, Jun, Kou, Hongchao
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 10.05.2017; Elsevier BV
• Subjects: Alloy design; Amorphous materials; Catastrophic failure analysis; Deformation; Dendritic structure; Mechanical properties; Metallic glasses; Nitrogen; Plastic deformation; Plastic strain; Polymer matrix composites; Solid-solution strengthening; Solution strengthening; Ti-based metallic glass composites; Titanium; Mechanical properties; Ti-based metallic glass composites; Solid-solution strengthening; Nitrogen; Alloy design
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2017.04.010

Different amounts of nitrogen from 1000 to 14,000wtppm were added into the Ti48Zr20Nb12Cu5Be15 bulk metallic glass composites. Results show that addition of nitrogen can increase the yield strength of composites from 1400 to 2350MPa due to the solid solution strengthening effect. The composites still owns certain plastic strain (above 10% when contains 14,000ppm nitrogen) before fracture under compressive test. The reason is attribute to nitrogen shows to be a much weaker activator for the formation of brittle α-Ti phase as compared with oxygen, which make the β-Ti dendrite still softer than that of the glassy phase, thus can enhance the strength of the materials but do not deteriorate the plasticity too much. Our research show that nitrogen can be added into the Ti-based metallic glass composites in a very large range to effectively tune the suitable mechanical properties of Ti-based metallic glass composites, without worrying about the catastrophic failure in the process of deformation.