*Article* **Versatile Medium Entropy Ti-Based Bulk Metallic Glass Composites**

**Tianzeng Liu 1,2, Yanchun Zhao 1,\*, Li Feng <sup>1</sup> and Pan Gong 3,\***


**Abstract:** An ultra-strong Ti-based bulk metallic glass composite was developed via the transformationinduced plasticity (TRIP) effect to enhance both the ductility and work-hardening capability of the amorphous matrix. The functionally graded composites with a continuous gradient microstructure were obtained. It was found that the austenitic center possesses good plasticity and toughness. Furthermore, the amorphous surface exhibited high strength and hardness, as well as excellent wear corrosion resistance. Compared with the Ti-6Al-4V alloy, bulk metallic glass composites (BMGCs) exhibit better spontaneous passivation behavior during the potential dynamic polarization. No crystallization was observed on the friction surface, indicating their good friction-reduction and anti-wear properties.

**Keywords:** bulk metallic glass; phase transformation; mechanical behavior; corrosion wear resistance
