Bulk metallic glasses combine plastic like processing with superb high-strength metal properties. Their processing opportunities originate from their high thermal stability which has been explored for exciting novel metal processing methods such as fused filament fabrication to 3D print, stretch blowmolding to fabricate previously unachievable shapes for metals, and micro and nanofabrication.
As BMGs are metastable, processing has to avoid crystallization, structural relaxation, and reduction of fictive temperature. We show here that drastic embrittlement can occur during processing or can be entirely avoided. Specifically, we reveal a flaw tolerance behavior of metallic glasses, a critical volume fraction of crystallinity for embrittlement, and a mechanical glass transition behavior, which all have to be understood to process BMGs such that embrittlement is avoided throughout the processing and complex BMG parts can be net-shaped which exhibit high fracture toughness.