Gold based bulk metallic glass
Abstract
Gold-based bulk metallic glass alloys based on Au-Cu-Si are introduced. The alloys exhibit a gold content comparable to 18-karat gold. They show very low liquidus temperature, large supercooled liquid region, and good processibility. The maximum casting thickness exceeds 5mm in the best glassformer. Au49Ag5.5Pd2.3Cu26.9Si16.3 has a liquidus temperature of 644K, a glass transition temperature of 401K, and a supercooled liquid region of 58K. The Vickers hardness of the alloys in this system is ∼350Hv, twice that of conventional 18-karat crystalline gold alloys. This combination of properties makes the alloys attractive for many applications including electronic, medical, dental, surface coating, and jewelry.
- Publication:
-
Applied Physics Letters
- Pub Date:
- August 2005
- DOI:
- 10.1063/1.2008374
- Bibcode:
- 2005ApPhL..87f1912S
- Keywords:
-
- 81.05.Kf;
- 81.40.Np;
- 62.20.Qp;
- 64.70.Pf;
- Glasses;
- Fatigue corrosion fatigue embrittlement cracking fracture and failure;
- Tribology and hardness;
- Glass transitions