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<p>A new Zr-based bulk metallic glass (Zr<sub>55.1</sub>Cu<sub>39.9</sub>Al<sub>5</sub>) with a large supercooled liquid region and outstanding mechanical properties was successfully fabricated in both ribbon and rod forms via melt spinning and copper mold casting. This simple ternary alloy exhibits excellent glass-forming ability and high thermal stability, as indicated by a distinct glass transition temperature (<i>T</i><sub><i>g</i></sub> = 673&#xa0;K) and an onset crystallization temperature (<i>T</i><sub><i>x</i>1</sub> = 739&#xa0;K), resulting in a wide supercooled liquid region (Δ<i>T</i><sub>x</sub> = 66&#xa0;K). Upon heating, the alloy undergoes a multi-step crystallization sequence: [am] → [am′ + Cu<sub>10</sub>Zr<sub>7</sub>] → [am″ + Cu<sub>10</sub>Zr<sub>7</sub> + CuZr<sub>2</sub>] → [Cu<sub>10</sub>Zr<sub>7</sub> + CuZr<sub>2</sub>]. The as-spun ribbons exhibit superior mechanical performance, with a high hardness of 464 HV, an elastic modulus of ~ 80 GPa, a tensile fracture strength of 1326&#xa0;MPa, and notable bending ductility. Furthermore, fully amorphous rods with diameters up to 1.5&#xa0;mm were obtained, displaying a high compressive fracture strength of ~ 1592&#xa0;MPa and a total elongation of about 9.3%. These results confirm the alloy’s exceptional combination of thermal and mechanical properties and demonstrate its promise for advanced structural and functional applications requiring high strength, hardness, ductility, and processability in bulk form.</p>

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Microstructural Evolution and Mechanical Properties of Zr55.1Cu39.9Al5 Metallic Glass

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Jing Ding,
  • Cong Liu,
  • Hao Wang,
  • Zhaocan Li,
  • Wenchao Liu,
  • Xiaolong Wang,
  • Jili Tian,
  • Wenna Chao,
  • Shengli Zhu

摘要

A new Zr-based bulk metallic glass (Zr55.1Cu39.9Al5) with a large supercooled liquid region and outstanding mechanical properties was successfully fabricated in both ribbon and rod forms via melt spinning and copper mold casting. This simple ternary alloy exhibits excellent glass-forming ability and high thermal stability, as indicated by a distinct glass transition temperature (Tg = 673 K) and an onset crystallization temperature (Tx1 = 739 K), resulting in a wide supercooled liquid region (ΔTx = 66 K). Upon heating, the alloy undergoes a multi-step crystallization sequence: [am] → [am′ + Cu10Zr7] → [am″ + Cu10Zr7 + CuZr2] → [Cu10Zr7 + CuZr2]. The as-spun ribbons exhibit superior mechanical performance, with a high hardness of 464 HV, an elastic modulus of ~ 80 GPa, a tensile fracture strength of 1326 MPa, and notable bending ductility. Furthermore, fully amorphous rods with diameters up to 1.5 mm were obtained, displaying a high compressive fracture strength of ~ 1592 MPa and a total elongation of about 9.3%. These results confirm the alloy’s exceptional combination of thermal and mechanical properties and demonstrate its promise for advanced structural and functional applications requiring high strength, hardness, ductility, and processability in bulk form.