|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Are Metallic Glasses Brittle or Ductile?
|On-Site Speaker (Planned)
Ductility is an important characteristic of crystalline metals as it is associated with high fracture toughness. The plastic strain occurring under tensile loading is a quantitative measure of ductility.
Metallic glasses (MGs) generally lack global ductility. However, they can exhibit remarkable high fracture toughness. MGs also exhibit ductility when loaded in bending as long as the sample is thin, less than ~10 times its plastic zone size.
We discuss this apparent discrepancy and introduce a critical stress gradient which is required for metallic glasses to exhibit plasticity.
We will then discuss the characteristics of MGs which indicate a high tendency for plasticity. Here, we distinguish between the contribution from chemical composition and processing, where the latter is often quantified in the fictive temperature.
We will then attempt to correlate the metallic glasses’ ability to plastically deform with its structure.
||Mechanical Properties, Shaping and Forming, Characterization