|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Ultrafine-grained and Heterostructured Materials (UFGH XII)
|Strengthening and Improving Fracture Toughness of Tungsten-copper Nanocomposites
|Klemens Schmuck, Markus Alfreider, Daniel Kiener
|On-Site Speaker (Planned)
Tungsten-copper composites are frequently considered for high performance applications. Compared to pure tungsten, tungsten-copper composites exhibit improved damage and fracture tolerance, but reduced material strength, mainly attributed to the ductile copper phase. Therefore, improving mechanical properties of the copper phase, i.e. by alloying, is desirable. Elemental powders were used as precursor to fabricate tungsten-copper-zinc composites with constant tungsten content of 80 wt.%, which lead to a substitution of the pure copper phase with a mechanically stronger brass-alloy. The copper/zinc ratio was varied up to 30 wt.% zinc, α-brass region, which exhibits high twinning tendency. Additionally, the powders were consolidated and grains were refined by conducting HPT, which allows to further increase composite’s strength, while sustaining ductility down to a certain grain size. In-situ experiments on FIB fabricated micro-cantilevers in a SEM were performed to measure crack growth and determined fracture toughness with respect to the zinc content and grain sizes.
|Nanotechnology, Mechanical Properties, Powder Materials