The pioneering work of Saito et al. on the Ti-Nb based gum metal, have been followed by many reports on this exciting material, investigating its “super” properties; e.g. ultra-low elastic modulus, ultra-high strength, super elasticity, super plasticity at room temperature, etc. After a decade of significant interest ...
In Ti-Nb alloys, depending on the stability of the beta phase, the active deformation mechanism switches between dislocation slip and mechanical twinning. However, for the gum metal, a recently developed Ti-Nb alloy, a unique deformation mechanism (termed as “giant fault mechanism”) is observed, which results in high strength, low Young's modulus and excellent cold workability ...
The ferrite-martensite dual phase (DP) steels are well-established and commonly used steel grades in the automotive industry. One of the main reasons of their success is the tunable mechanical characteristics with relatively well-controlled processing parameters. However, similar to other metallic alloy systems, DP steels are susceptible to the inverse strength-ductility problem ...
High entropy alloys (HEA) are newly developed multi-components alloy systems wherein the configurational entropy is higher than the fusion entropy of most common metals. Instead of ordered intermetallics expected from classic physical metallurgy, simple constituent phases like BCC and FCC have been widely found in many HEA systems...
S. Voß 1, F. Stein 1,2, M. Palm 1,2, D. Raabe 1, F. Liot 2, M. Friák 2, T. Hickel 2, J. Neugebauer 2 1 Department of Microstructure Physics and Metal Forming 2 Department of Computational Materials Design
Continuum damage models require experimental determination of a material-specific damage parameter, D, which, for new complex-microstructured metals (e.g. dual-phase or TRIP steel, ultrafine-grained metals, thin metallic films), calls for highly accurate damage measurement methodologies...
Nearly a century ago, researchers referred to microstructural bands with a rather intriguing name: ghosts. Although this nomenclature seems surprising at first, it can be understood upon closer inspection ...
“Gum metal” is a recently developed class of beta (i.e. bcc) titanium-based alloys, which possesses an excellent yet unusual mechanical behavior: At room temperature, when deformed in tension, it exhibits high yield stress (up to 1 GPa) and outstanding elongation to failure (up to 35%). Despite the rapidly growing interest in this alloy class ...
Dual phase steels are interesting materials for the automotive industry for weight minimization and increased crashworthiness, although their dynamic tensile deformation behavior is not well understood. To this end, a major challenge is to reveal the change in the microstructural deformation mechanisms as a function of the applied strain rate...
Analysis of strain and stress partitioning in multi-phase systems is crucial in understanding the behavior of existing high strength alloys and designing new alloys with improved properties. This is a highly challenging problem which cannot be solved solely through the use of traditional experimental tools or by stand-alone numerical homogenization simulations...
