We investigated the mechanical properties of glassy solid and supercooled liquid in a La55Al20Ni25(at. %) metallic glass that has a wide supercooled liquid region of 65 K before crystallization. The supercooled liquid above the glass transition temperature (Tg) exhibited superplastic-like behavior during isothermal tensile deformation at strain rates in the range of 10-4 s-1 to 100 s-1. The maximum elongation to failure was in excess of 1800 % at a strain rate of 5. 0 ×10-2 s-1 and at 503 K (Tg+20 K, 0. 71Tm) under about 40 MPa. The supercooled liquid of the metallic glass exhibited a strain-rate sensitivity exponent (m value) of nearly 1. 0. The superplasticity of the La55Al20Ni25 metallic glass was superior to that of the Zr65Al10Ni10Cu15 metallic glass. The metallic glass, moreover, have many advantages in the superplastic deformation as compaered with polycrystalline superplastic materials.
|ジャーナル||Materials Science Forum|
|出版ステータス||Published - 1999 1 1|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering