Glass-to-glass transition enables superhigh thermal stability and glass formability for thermoplastic shaping of FeBNbYCr alloys

作者：Li, Yongtai; Wen, Donghui; Huang, Zhaowen; Kong, Fengyu; Li, Mingcan^*; Zhao, Chengliang; Wu, Zhenduo^*; Wang, Anding^*

来源：Journal of Non-Crystalline Solids, 2023, 611: 122332.

DOI：10.1016/j.jnoncrysol.2023.122332

• Glass to glass transition
• Thermal stability
• Glass formability
• Thermoplastic shaping
• Fe-based metallic glass

Fe-based bulk metallic glasses (BMGs) exhibit attractive properties, yet their thermal stability and glass formability (GFA) are always lower than the other thermoplastic shaping (TPS) alloys. Here, we developed a new Crdoped Fe65B22.8Nb3.7Y4.5Cr4 alloy with a super-wide supercooled liquid region (SCLR) (Delta T-x=112 K) and high GFA (>= 3 mm) with industrial materials. Glassy rods can maintain the glassy structure after annealing and hot pressing at 923 K, and exhibit a high fracture strength of > 3000 MPa and hardness of > 900 H-v in annealed states. The BMG rods can be conveniently TPS in the SCLR with low compressive stress of < 250 MPa. It is found that the additional glass-to-glass transition (GGT) in the SCLR effectively improves the GFA and thermal stability, by complicating and postponing the transition and crystallization process. The introduction of GGT offers a new strategy to develop high-performance BMGs for precision TPS.

• 单位
  东莞理工学院; 新疆大学