Insights into the crystallisation pathways in as-cast Ti40Zr10Cu36Pd14 glassy alloys

Biocompatible titanium-based bulk metallic glasses (Ti-based BMGs) are attractive for application in minimally invasive medical devices. They present a desirable set of properties, including low Young's modulus (E ≈ 100 GPa) and high yield strength (σ ≈ 2000 MPa). However, their implementation into practical applications is in part hindered by their limited glass forming ability (GFA) compared to BMG systems already commercialised. Due to their limited GFA, Ti-BMGs are more susceptible to crystallisation. This study investigates the crystalline heterogeneities found in Ti40Zr10Cu36Pd14 (at.%) glasses cast in automated equipment operating under close-to-industrial conditions. Distinct categories of crystallites are identified through microstructural observations and statistical analyses. Insight is provided on the complex crystallisation pathways that may be followed during cooling. Beyond the scientific contribution, the results indicate directions for the development and improvement of the manufacturing of Ti40Zr10Cu36Pd14.